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Showing 1 - 200 of 707 Journals sorted alphabetically
ABCD. Arquivos Brasileiros de Cirurgia Digestiva     Open Access   (Followers: 2, SJR: 0.207, CiteScore: 1)
Acta Agronómica     Open Access  
Acta Amazonica     Open Access   (Followers: 6, SJR: 0.36, CiteScore: 1)
Acta Bioethica     Open Access   (SJR: 0.196, CiteScore: 0)
Acta Botanica Brasilica     Open Access   (Followers: 3, SJR: 0.325, CiteScore: 1)
Acta botánica mexicana     Open Access   (Followers: 1, SJR: 0.212, CiteScore: 0)
Acta Cirurgica Brasileira     Open Access   (SJR: 0.395, CiteScore: 1)
Acta Limnologica Brasiliensia     Open Access   (Followers: 4, SJR: 0.28, CiteScore: 1)
Acta Literaria     Open Access   (Followers: 5, SJR: 0.1, CiteScore: 0)
Acta Medica Colombiana     Open Access   (Followers: 1)
Acta Médica Costarricense     Open Access   (Followers: 2)
Acta Neurológica Colombiana     Open Access   (Followers: 2)
Acta Ortopédica Brasileira     Open Access   (Followers: 1, SJR: 0.343, CiteScore: 1)
Acta Paulista de Enfermagem     Open Access   (Followers: 2, SJR: 0.275, CiteScore: 1)
Acta Pediátrica Costarricense     Open Access   (Followers: 1)
Acta Scientiarum. Agronomy     Open Access   (Followers: 6, SJR: 0.431, CiteScore: 1)
Acta zoológica mexicana     Open Access  
Actualidades Biológicas     Open Access   (Followers: 1)
African Human Rights Law J.     Open Access   (Followers: 17)
African Natural History     Open Access   (Followers: 2, SJR: 0.198, CiteScore: 1)
Afro-Asia     Open Access  
Ágora - studies in psychoanalytic theory     Open Access   (Followers: 3, SJR: 0.132, CiteScore: 0)
Agricultura Tecnica     Open Access   (Followers: 5)
Agrociencia     Open Access   (Followers: 1, SJR: 0.2, CiteScore: 0)
Agrociencia Uruguay     Open Access  
Agronomía Mesoamericana     Open Access  
Aisthesis     Open Access   (Followers: 7, SJR: 0.106, CiteScore: 0)
Alea : Estudos Neolatinos     Open Access   (Followers: 2, SJR: 0.1, CiteScore: 0)
Alfa : Revista de Linguística     Open Access  
Alpha (Osorno)     Open Access   (SJR: 0.138, CiteScore: 0)
Ambiente & sociedade     Open Access   (Followers: 3, SJR: 0.235, CiteScore: 0)
Ambiente & Agua : An Interdisciplinary J. of Applied Science     Open Access   (Followers: 1, SJR: 0.263, CiteScore: 1)
Ambiente Construído     Open Access   (Followers: 1)
América Latina en la historia económica     Open Access   (Followers: 4, SJR: 0.134, CiteScore: 0)
Anais Brasileiros de Dermatologia     Open Access   (Followers: 3, SJR: 0.52, CiteScore: 1)
Anais da Academia Brasileira de Ciências     Open Access   (Followers: 2, SJR: 0.418, CiteScore: 1)
Anais do Museu Paulista : História e Cultura Material     Open Access  
Anales de Medicina Interna     Open Access   (Followers: 1)
Anales del Instituto de la Patagonia     Open Access  
Anales del Sistema Sanitario de Navarra     Open Access   (Followers: 1, SJR: 0.157, CiteScore: 0)
Análise Psicológica     Open Access   (Followers: 1, SJR: 0.16, CiteScore: 0)
Análise Social     Open Access   (Followers: 3, SJR: 0.16, CiteScore: 0)
Andean geology     Open Access   (Followers: 9, SJR: 0.674, CiteScore: 1)
Antipoda. Revista de Antropología y Arqueología     Open Access   (Followers: 5, SJR: 0.135, CiteScore: 0)
Anuario Colombiano de Historia Social y de la Cultura     Open Access   (SJR: 0.1, CiteScore: 0)
Anuario de Historia Regional y de las Fronteras     Open Access  
Apuntes : Revista de Estudios sobre Patrimonio Cultural - J. of Cultural Heritage Studies     Open Access   (Followers: 6)
Archivos de Medicina Veterinaria     Open Access   (Followers: 1, SJR: 0.194, CiteScore: 0)
Archivos de Neurociencias     Open Access   (Followers: 3, SJR: 0.111, CiteScore: 0)
Archivos de Pediatria del Uruguay     Open Access   (Followers: 3)
Archivos de Zootecnia     Open Access   (Followers: 1, SJR: 0.202, CiteScore: 0)
Archivos Españoles de Urología     Open Access   (SJR: 0.178, CiteScore: 0)
Argos     Open Access   (Followers: 1)
ARQ     Open Access   (Followers: 6, SJR: 0.113, CiteScore: 0)
Arquitectura y Urbanismo     Open Access   (Followers: 3)
Arquivo Brasileiro de Medicina Veterinária e Zootecnia     Open Access   (SJR: 0.248, CiteScore: 0)
Arquivos Brasileiros de Cardiologia     Open Access   (Followers: 1, SJR: 0.381, CiteScore: 1)
Arquivos Brasileiros de Endocrinologia e Metabologia     Open Access  
Arquivos Brasileiros de Oftalmologia     Open Access   (Followers: 1, SJR: 0.518, CiteScore: 1)
Arquivos de Gastroenterologia     Open Access   (Followers: 1, SJR: 0.396, CiteScore: 1)
Arquivos de Medicina     Open Access  
Arquivos de Neuro-Psiquiatria     Open Access   (SJR: 0.448, CiteScore: 1)
Arquivos do Instituto Biológico     Open Access   (Followers: 1)
Arquivos Internacionais de Otorrinolaringologia     Open Access  
ARS     Open Access   (Followers: 4)
Atenea (Concepción)     Open Access   (SJR: 0.112, CiteScore: 0)
Atmósfera     Open Access   (Followers: 2, SJR: 0.449, CiteScore: 1)
Audiology - Communication Research     Open Access   (Followers: 10)
Avaliação : Revista da Avaliação da Educação Superior (Campinas)     Open Access  
Avances en Enfermería     Open Access   (Followers: 2)
Avances en Odontoestomatologia     Open Access   (SJR: 0.105, CiteScore: 0)
Avances en Periodoncia e Implantología Oral     Open Access   (Followers: 1)
Bakhtiniana : Revista de Estudos do Discurso     Open Access   (SJR: 0.103, CiteScore: 0)
BAR. Brazilian Administration Review     Open Access   (Followers: 1, SJR: 0.137, CiteScore: 0)
Biota Neotropica     Open Access   (SJR: 0.381, CiteScore: 1)
Biotecnología Aplicada     Open Access   (SJR: 0.146, CiteScore: 0)
Biotecnología en el Sector Agropecuario y Agroindustrial     Open Access  
Boletim de Ciências Geodésicas     Open Access   (SJR: 0.188, CiteScore: 0)
Boletim do Museu Paraense Emílio Goeldi. Ciências Humanas     Open Access   (Followers: 1, SJR: 0.238, CiteScore: 0)
Boletin Chileno de Parasitologia     Open Access  
Boletín de Filología     Open Access  
Boletín de la Sociedad Botánica de México     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Boletín de la Sociedad Geológica Mexicana     Open Access   (SJR: 0.291, CiteScore: 1)
Boletín del Museo Chileno de Arte Precolombino     Open Access   (Followers: 1, SJR: 0.233, CiteScore: 0)
Bosque     Open Access   (Followers: 2, SJR: 0.29, CiteScore: 1)
Bragantia     Open Access   (Followers: 2, SJR: 0.555, CiteScore: 1)
Brazilian Archives of Biology and Technology     Open Access   (Followers: 3, SJR: 0.281, CiteScore: 1)
Brazilian Dental J.     Open Access   (Followers: 3, SJR: 0.476, CiteScore: 1)
Brazilian J. of Biology     Open Access   (Followers: 3, SJR: 0.523, CiteScore: 1)
Brazilian J. of Chemical Engineering     Open Access   (Followers: 5, SJR: 0.395, CiteScore: 1)
Brazilian J. of Food Technology     Open Access   (Followers: 3, SJR: 0.206, CiteScore: 0)
Brazilian J. of Medical and Biological Research     Open Access   (SJR: 0.611, CiteScore: 2)
Brazilian J. of Microbiology     Open Access   (Followers: 4, SJR: 0.63, CiteScore: 2)
Brazilian J. of Oceanography     Open Access   (Followers: 1, SJR: 0.425, CiteScore: 1)
Brazilian J. of Oral Sciences     Open Access   (Followers: 2, SJR: 0.131, CiteScore: 0)
Brazilian J. of Physical Therapy     Open Access   (SJR: 0.802, CiteScore: 2)
Brazilian J. of Plant Physiology     Open Access   (Followers: 3, SJR: 1.178, CiteScore: 3)
Brazilian J. of Veterinary Research and Animal Science     Open Access   (Followers: 8, SJR: 0.225, CiteScore: 0)
Brazilian Oral Research     Open Access  
Brazilian Political Science Review     Open Access   (Followers: 2)
Bulletin of the World Health Organization     Open Access   (Followers: 18, SJR: 2.532, CiteScore: 3)
Caderno CRH     Open Access   (Followers: 3, SJR: 0.233, CiteScore: 0)
Caderno de Estudos     Open Access  
Cadernos CEDES     Open Access   (Followers: 1, SJR: 0.119, CiteScore: 0)
Cadernos de Pesquisa     Open Access   (Followers: 2, SJR: 0.183, CiteScore: 0)
Cadernos de Saúde Pública     Open Access   (Followers: 1, SJR: 0.568, CiteScore: 1)
Cadernos de Tradução     Open Access  
Cadernos Metrópole     Open Access   (Followers: 1)
Cadernos Nietzsche     Open Access  
Cadernos Pagu     Open Access   (SJR: 0.356, CiteScore: 0)
Cadernos Saúde Coletiva     Open Access   (Followers: 1)
Caldasia     Open Access   (SJR: 0.195, CiteScore: 0)
Calidad en la educación     Open Access   (Followers: 1)
Case Reports     Open Access  
Cerâmica     Open Access   (Followers: 5, SJR: 0.186, CiteScore: 0)
CES Medicina     Open Access  
Chilean J. of Agricultural Research     Open Access   (Followers: 1, SJR: 0.377, CiteScore: 1)
Chungara (Arica) - Revista de Antropologia Chilena     Open Access   (Followers: 1, SJR: 0.565, CiteScore: 1)
Ciência & Saúde Coletiva     Open Access   (Followers: 2, SJR: 0.566, CiteScore: 1)
Ciência & Educação (Bauru)     Open Access  
Ciência Animal Brasileira     Open Access   (Followers: 1, SJR: 0.216, CiteScore: 0)
Ciência da Informação     Open Access   (Followers: 1, SJR: 0.121, CiteScore: 0)
Ciencia del suelo     Open Access   (Followers: 2)
Ciência e Agrotecnologia     Open Access   (SJR: 0.383, CiteScore: 1)
Ciencia e Cultura     Open Access   (Followers: 1)
Ciencia e investigación agraria     Open Access   (Followers: 1, SJR: 0.211, CiteScore: 0)
Ciencia forestal en México     Open Access  
Ciência Rural     Open Access   (Followers: 2, SJR: 0.337, CiteScore: 1)
Ciencia y Enfermeria - Revista Iberoamericana de Investigacion     Open Access   (Followers: 3, SJR: 0.158, CiteScore: 0)
Ciencias Marinas     Open Access   (Followers: 3, SJR: 0.414, CiteScore: 1)
Ciencias Psicológicas     Open Access  
Cirugia Plastica Ibero-Latinoamericana     Open Access   (SJR: 0.166, CiteScore: 0)
CLEI Electronic J.     Open Access  
Clínica y Salud     Open Access   (SJR: 0.173, CiteScore: 0)
Clinics     Open Access   (SJR: 0.536, CiteScore: 1)
CoDAS     Open Access   (SJR: 0.267, CiteScore: 0)
Comuni@cción     Open Access   (Followers: 1)
Comunicación y sociedad     Open Access   (Followers: 2, SJR: 0.327, CiteScore: 0)
Contaduría y Administración     Open Access   (SJR: 0.219, CiteScore: 0)
Contexto Internacional     Open Access  
Convergencia     Open Access   (Followers: 3, SJR: 0.196, CiteScore: 0)
Correo Científico Médico     Open Access  
Corrosão e Protecção de Materiais     Open Access  
Crop Breeding and Applied Biotechnology     Open Access   (Followers: 3, SJR: 0.609, CiteScore: 1)
Cuadernos de Administración (Universidad del Valle)     Open Access   (Followers: 2)
Cuadernos de Economía     Open Access   (SJR: 0.115, CiteScore: 0)
Cuadernos de Economía     Open Access   (Followers: 2)
Cuadernos de Economia - Latin American J. of Economics     Open Access   (Followers: 3)
Cuadernos de Historia     Open Access   (Followers: 1)
Cuadernos de Historia de la Salud Publica     Open Access  
Cuadernos de Medicina Forense     Open Access   (Followers: 2, SJR: 0.1, CiteScore: 0)     Open Access   (SJR: 0.38, CiteScore: 0)
Cubo. A Mathematical J.     Open Access  
Cuicuilco     Open Access   (Followers: 1)
Cultivos Tropicales     Open Access   (Followers: 1)
Culturales     Open Access   (Followers: 3)
Dados - Revista de Ciências Sociais     Open Access   (SJR: 0.37, CiteScore: 0)
De Jure     Open Access   (Followers: 1)
DELTA : Documentação de Estudos em Lingüística Teórica e Aplicada     Open Access   (SJR: 0.133, CiteScore: 0)
Dementia & Neuropsychologia     Open Access   (Followers: 10, SJR: 0.205, CiteScore: 0)
Dental Press J. of Orthodontics     Open Access   (Followers: 4, SJR: 0.489, CiteScore: 1)
Desacatos     Open Access   (Followers: 1)
Desarrollo y Sociedad     Open Access   (Followers: 3, SJR: 0.109, CiteScore: 0)
Diálogo Andino - Revista de Historia, Geografía y Cultura Andina     Open Access   (Followers: 1, SJR: 0.116, CiteScore: 0)
Diánoia     Open Access   (Followers: 1)
Dimensión Empresarial     Open Access  
Dynamis : Acta Hispanica ad Medicinae Scientiarumque Historiam Illustrandam     Open Access   (Followers: 2, SJR: 0.131, CiteScore: 0)
e-J. of Portuguese History     Open Access   (Followers: 2, SJR: 0.101, CiteScore: 0)
Eclética Química     Open Access   (Followers: 1)
Ecología en Bolivia     Open Access  
Economia Aplicada     Open Access   (SJR: 0.208, CiteScore: 0)
Economia e Sociedade     Open Access  
EconoQuantum     Open Access  
Educação & Sociedade     Open Access   (Followers: 3)
Educação e Pesquisa     Open Access   (Followers: 1, SJR: 0.163, CiteScore: 0)
Educação em Revista     Open Access  
Educación Matemática     Open Access  
Educación Médica     Open Access   (Followers: 1, SJR: 0.236, CiteScore: 0)
Educación Médica Superior     Open Access   (Followers: 1, SJR: 0.237, CiteScore: 0)
Educación y Educadores     Open Access  
Educar em Revista     Open Access  
EDUMECENTRO     Open Access  
En-Claves del pensamiento     Open Access   (Followers: 1, SJR: 0.194, CiteScore: 0)
Encuentros     Open Access  
Ene : Revista de Enfermería     Open Access  
Enfermería Global     Open Access   (Followers: 3, SJR: 0.165, CiteScore: 0)
Enfermería Nefrológica     Open Access   (Followers: 1, SJR: 0.198, CiteScore: 0)
Enfoques     Open Access  
Engenharia Agrícola     Open Access   (SJR: 0.305, CiteScore: 1)
Engenharia Sanitaria e Ambiental     Open Access   (SJR: 0.218, CiteScore: 0)
Ensaio Avaliação e Políticas Públicas em Educação     Open Access   (Followers: 1, SJR: 0.254, CiteScore: 0)
Entomologia y Vectores     Open Access   (Followers: 2)
Escritos de Psicología : Psychological Writings     Open Access   (Followers: 2)
Estudios Atacameños     Open Access   (Followers: 2, SJR: 0.446, CiteScore: 1)
Estudios Constitucionales     Open Access   (Followers: 5, SJR: 0.319, CiteScore: 0)
Estudios de Cultura Maya     Open Access   (Followers: 2, SJR: 0.272, CiteScore: 0)
Estudios de Economía     Open Access   (SJR: 0.121, CiteScore: 0)
Estudios de historia moderna y contemporánea de México     Open Access   (SJR: 0.101, CiteScore: 0)
Estudios Filologicos     Open Access   (SJR: 0.107, CiteScore: 0)

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Boletín de la Sociedad Geológica Mexicana
Journal Prestige (SJR): 0.291
Citation Impact (citeScore): 1
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1405-3322
Published by SciELO Homepage  [707 journals]
  • Computing development of kinetic equations for the
           dissolution/precipitation of minerals in aqueous fluids

    • Abstract: Resumen Este artículo presenta el desarrollo de algoritmos fundamentales para la solución de un sistema no lineal de ecuaciones diferenciales de primer orden. El sistema representa la precipitación y/o disolución cinética de sólidos minerales en sistemas acuosos. Los algoritmos son válidos para un rango de temperaturas desde 20°C hasta temperaturas mayores a 320°C, presiones desde 1 bar hasta 1000 bar, y soluciones con fuerzas iónicas hasta 6 mol/kg. Esta herramienta numérica predice correctamente: a) las concentraciones de iones y cationes, o especies primarias y secundarias, que participan o que se producen durante la disolución/precipitación de uno o más minerales; b) la cantidad de moles remanentes de los minerales disueltos, así como la precipitación termodinámica simultánea de otros minerales asociados a la disolución cinética. We developed equations and algorithms for solving a non-linear system of first order differential equations. The system represents a model for the kinetic dissolution and precipitation of minerals in aqueous electrolyte solutions. Our algorithm is valid for temperatures ranging from 20 to 320°C, pressures from 1 to 1000 bar, and ionic strengths of up to 6 mol/kg. Our numerical tool predicts correctly the types and concentrations of: a) minerals dissolved or precipitated through time; b) ions and cations produced and consumed (aqueous species) during the kinetic dissolution/precipitation of one or more minerals in solution.
  • Spatial variability of organic and inorganic carbon in soils of the
           Comarca Lagunera, México

    • Abstract: Resumen Las reservas de carbono orgánico, inorgánico y total son controladas parcialmente por la exposición a las condiciones ambientales, la cobertura vegetal y el uso del suelo. La geoestadística ha ayudado a comprender la distribución de los almacenes de carbono (orgánico, inorgánico y total) en el suelo. Sin embargo, existe escasa explicación de los factores que la determinan, específicamente en zonas áridas, y de su variabilidad espacial. Los objetivos de este trabajo fueron determinar las reservas de carbono orgánico e inorgánico en suelos agrícolas de la Comarca Lagunera de México, establecer su distribución y variabilidad espacial mediante el método geoestadístico kriging ordinario y validar los mapas temáticos con datos reales. Las reservas de carbono orgánico, inorgánico y total del suelo de muestras georreferenciadas se examinaron mediante un análisis de la semivarianza; los datos geoestadísticos se interpolaron, para obtener mapas temáticos de predicción de las mismas. Posteriormente, se validaron los mapas con datos de campo. Las reservas de carbono orgánico, inorgánico y total del suelo mostraron variabilidad espacial, cuya dependencia espacial del almacén de carbono orgánico del suelo fue débil (82.4%), mientras que la del carbono inorgánico y total fue moderada (26.6 y 35.0%, respectivamente). Los mapas temáticos de los almacenes de carbono orgánico e inorgánico difirieron, teniendo el mapa de carbono inorgánico un error de 2.01 Mg ha-1 y el de carbono orgánico 4.69 Mg ha-1. El uso y manejo de los suelos en esta área influyeron en la distribución espacial de las reservas de carbono, mientras que la fisiografía, el material parental y el clima intervinieron en la distribución espacial del carbono inorgánico. Organic, inorganic and total soil carbon stocks are partially controlled by exposure to environmental conditions, vegetation cover and land use. Geostatistics has helped to understand the distribution of carbon stocks (organic, inorganic and total) in the soils. However, there is little explanation of factors that determine it, specifically arid regions, and their spatial variability. The objectives of this work were to determine the organic and inorganic carbon reserves in agricultural soils of the Comarca Lagunera in Mexico, to establish their distribution and spatial variability using ordinary kriging and to validate the thematic maps whit real data. The correlation spatial of organic, inorganic and total soil carbon stocks of georeferenced samples were examined by an analysis of semivariance; the data were interpolated to obtain thematic maps of prediction of the different carbon stocks. Subsequently, the maps were validated with field data. The organic, inorganic and total soil carbon stocks showed spatial correlation, which was weak for the soil organic carbon storage (82.4%), and moderate for the inorganic and total carbon (26.6 and 35.0%, respectively). The thematic maps of organic and inorganic carbon stores differed, with the inorganic carbon map having an error of 2.01 Mg ha-1, which was lower than that of organic carbon (4.69 Mg ha-1). The use and management of soils in this area influenced the spatial distribution of carbon stocks, while physiography, parent material and climate intervened in the spatial distribution of inorganic carbon.
  • Titan2F code for lahar hazard assessment: derivation, validation and

    • Abstract: Debris flows, lahars, avalanches, landslides, and other geophysical mass flows can contain material in the order of O(106-1010) m3 or more. These flows commonly consist of a mixture of soil and rocks with a significant quantity of interstitial fluid. They can be tens of meters deep, and their runouts can extend many kilometers. The complicated rheology of such a mixture challenges every constitutive model that can reasonably be applied: The range of length and timescales involved in such mass flows challenge the computational capabilities of existing models. This paper extends recent efforts to develop a depth averaged “thin layer” model for geophysical mass flows that contain a mixture of solid material and fluid. Concepts from the engineering community are integrated with phenomenological findings in geoscience, resulting in a theory that accounts for the principal solid and fluid forces as well as interactions between the phases, across a wide range of solid volume fractions. A principal contribution here is to present drag and phase interaction terms that conform with the literature in geosciences. The Titan2F program predicts the evolution of the volumetric concentration of solids and dynamic pressure. The theory is validated with data from one-dimensional dam break solutions and with data from artificial channel experiments.Resumen Los flujos de escombros, lahares, avalanchas, deslizamientos y otros flujos de masa geofísicos, pueden contener material del orden de O(106-1010) m3 o más. Estos flujos consisten comúnmente en una mezcla de sólidos y rocas, con una cantidad significativa de fluido intersticial. Pueden tener decenas de metros de espesor y un alcance de muchos kilómetros. La reología complicada de esta mezcla desafía cualquier modelo constitutivo que pueda ser aplicado con solidez. El rango de longitudes y escalas de tiempo involucrados en estos flujos de masa desafía también las capacidades computacionales de los modelos existentes. Este trabajo extiende esfuerzos recientes para desarrollar modelos de “capas delgadas”, integrados en profundidad, para flujos de masa que contienen una mezcla de material sólido y fluido. Se integran conceptos ingenieriles con hallazgos fenomenológicos en las geociencias, que resultan en una teoría que tiene en cuenta las principales fuerzas de partículas y fluidos, así como las interacciones entre las fases a través de un amplio rango de fracciones volumétricas de sólidos. La principal contribución aquí, es presentar términos para el arrastre y la interacción entre fases, los cuales concuerdan con la literatura de las geociencias. El programa Titan2F predice la evolución de la concentración y presión dinámica. La teoría es validada con datos de soluciones unidimensionales para ruptura de presas y verificada con datos de experimentos de canales artificiales.
  • Geochronology of Mexican mineral deposits. VII: the Peña Colorada
           magmatic-hydrothermal iron oxide deposits (IOCG “clan”), Colima

    • Abstract: The Peña Colorada mineralized area contains several iron oxide-apatite (IOA) deposits around the arguably richest known iron resource in Mexico. The Lower Cretaceous volcano-sedimentary host rock sequence has been subjected to several episodes of hydrothermal alteration, each accompanied by a distinct episode of faulting and intrusion (calc-alkaline to tholeiitic). Faulting is partly associated with the reactivation of cryptic structural corridors in basement rocks. High-resolution 40Ar/39Ar and apatite fission track (AFT) dating of this deposit and the adjacent Arrayanes prospect reveal the following sequence of events that range from the latest Cretaceous to the earliest Eocene: (1) intrusion of a 67.6 ± 3.5 Ma magnetite-bearing diorite with associated skarn/skarnoid metamorphism that was coeval or predated N-S to NNW-SSE faulting; (2) approximately 63.26 Ma syenite-like potassic alteration with disseminated magnetite, predated by N-S to NNW-SSE faulting and postdated by WNW-ESE faulting; (3) intrusion of 62.0 ± 2.5 Ma diorite and 59.39 ± 0.21 Ma andesite dikes that predate the main mineralization event at 55.72 to 54.84 Ma of large semi-stratabound massive and disseminated bodies; (4) intrusion of a 53.3 ± 3.0 Ma magnetite-bearing gabbro and 53 ± 2 Ma pegmatoid magnetite + fluorapatite veins at the Arrayanes prospect, which overlap the WNW-ESE faulting; (5) 50.70 to 48.18 Ma polymictic magnetite breccia as the last stage of mineralization in the area, predated by E-W faulting; and (6) reactivation of WNW-ESE faults and later NE-SW faults. Therefore, the total age span of the Peña Colorada deposit ranges between approximately 19 and 23 million years. The closeness in age between intrusions and mineralization in the Arrayanes prospect, their confinement between the WNW-ESE and E-W structural domains, and mingling or mixing structures between gabbro and diorite with an associated magmatic magnetite enrichment support the idea of a close genetic link between such intrusives and IOA hydrothermal mineralization. All mineralization events at Peña Colorada are associated with pervasive potassic to propylitic alteration, whereas at Arrayanes they are associated with dominant sodic alteration instead. Alteration features are suggestive of relatively shallow and deep formation of these deposits, respectively. Event 3 thermally reset fluorapatite in fragments of pegmatoid magnetite + fluorapatite + diopside associations (dated at 59 ± 2 Ma, AFT) within the polymictic breccia, which were sampled from a deep orebody (still to be found) and that would be likely associated with event 1 or 2. Consequently, exploration endeavors at depth at Peña Colorada may be considered promising. In this study, we use numerous geological and geochemical proxies to constrain the likeliest genetic model for the Peña Colorada and neighboring deposits: (a) the nearness in time and space between hydrothermal mineralization and magnetite-rich, tholeiitic, relatively oxidized intrusive rocks; (b) the occurrence of key mineral associations (i.e. magnetite + fluorapatite ± diopside veins); (c) the exclusive occurrence of fluorapatite in lieu of other apatites; (d) the composition in key major cations (Ca, Fe, Na, Mn) in fluorapatite; (e) the correlations between Ni/Cr vs. Ti values, between Ti+V vs. Ni/(Cr+Mn) values, between Ti+V vs. Al+Mn values, and Mg contents in magnetite; (f) pyroxene thermometry; (g) log f(O2) values calculated from Mn contents in fluorapatite; and (h) normalized REE patterns, and ΣLREE and ΣHREE contents in fluorapatite. These proxies indicate that IOA deposits in the Peña Colorada area have a hydrothermal origin with a strong magmatic influence (magmatic-hydrothermal iron oxide, or MHIO, deposits) that formed under high oxygen fugacities and “moderate” temperatures, and with a high geochemical affinity with IOCG and Kiruna-type deposits or the general IOCG “clan” (for both hydrothermal minerals and associated hypabyssal rocks). Relatively high Ti contents in magnetite, and high Ce and low Eu contents in fluorapatite in these deposits (with respect to typical compositions in IOCG “clan” deposits) are geochemical features still in need of further explanation. The correlation between regional and local structural domains and the geochronologic study in this paper constrain the possible ages of such domains as follows: (1) the N-S to NNW-SSE domain can be bracketed between 67.6 and 63.26 Ma, (2) the WNW-ESE domain between 63.26 and 59.39 Ma, (3) the E-W domain between 54.84 and 50.70 Ma, (4) the WNW-ESE to NW-SE domain is younger than 48.18 Ma, and (5) the NE-SW domain is still active. The structural analysis also shows that the massive orebody at Peña Colorada is partially stratabound but its emplacement was also controlled by low-angle Laramide faults, and that hydrothermal fluids were preferentially driven through volcano-sedimentary rocks. The latter characteristic is not only a matter of the stratigraphic distribution of relatively pervasive versus impervious rocks but also of the lateral distribution of such rocks due to N-S strike-slip faults. As additional results of this study, we determined that the conglomerates atop the host volcano-sedimentary sequence that were initially attributed to the Cerro de la Vieja Formation cannot be older than 67.6 Ma, and that the IOA deposits at Peña Colorada would be formed at depths of only a few hundred meters.resumen está disponible en el texto completo
  • Analysis of flux systems in an aquifer disturbed by growndwater
           extraction. Case of the Morelia-Capula area, Michoacán

    • Abstract: Resumen La zona Morelia-Capula depende totalmente del agua subterránea para el abasto de sus más de 120000 habitantes. La extracción del agua subterránea ha ocasionado que en los pozos el nivel piezométrico se haya abatido más de 45 metros en un periodo de 21 años. Dada la importancia del sistema acuífero de la zona Morelia-Capula es necesario profundizar en su entendimiento, por lo cual se aborda su estudio desde la perspectiva de los sistemas de flujo Tóthianos. Se recurre a tres parámetros para identificar la dinámica del agua subterránea, la temperatura, los iones mayores y la profundidad (nivel estático). Se analizaron muestras de agua subterránea en un total de 35 sitios (29 pozos y 6 manantiales), se encontraron 26 flujos intermedios, 8 locales y 1 regional. El sistema de flujo local se ubica en los estratos superiores del sistema acuífero y se evidencia en pozos poco profundos y manantiales. El sistema de flujo intermedio se encuentra en toda la zona de estudio por debajo de los locales; la mayor parte de los pozos están extrayendo agua de este sistema. Los sistemas de flujo local e intermedio se localizan tanto en la unidad terrígena como en la volcánica. El sistema de flujo regional se encuentra únicamente en la unidad volcánica que subyace a la terrígena, y pocos pozos han entrado en contacto con este sistema de flujo; la tendencia del abatimiento muestra que en los próximos años este sistema será el que provea de agua a la zona. Se encontró que la extracción intensiva y la presencia de fallas geológicas favorecen la mezcla de flujos. La mayor parte del abasto hídrico de la zona depende del sistema de flujo intermedio. La zona presenta un abatimiento anual promedio de 2.13 m/año. La dirección de flujo de los flujos locales e intermedios sigue en general la topografía de la zona, aunque se presentan alteraciones puntuales debido a la formación de conos de abatimiento. Los resultados indican que es necesario implementar estrategias para evitar contaminar los flujos locales y por otra parte disminuir la presión hídrica derivada de la extracción en los sistemas intermedio y regional. The Morelia-Capula zone depends entirely on groundwater for the supply of its more than 120000 inhabitants. The groundwater extraction has caused a decrease in the piezometric level estimated at more than 45 meters in a period of 21 years. Because of the importance of the aquifer system of the Morelia-Capula zone it is necessary to have a complete understating of the system, therefore, this study is carried out from the perspective of the Tothian flow systems. Three parameters are used to identify the groundwater dynamics, temperature, major ions, and depth (static level). Groundwater samples were analyzed in a total of 35 sites (29 wells and 6 springs), consisting of 26 intermediate, 8 local, and 1 regional flows. The local flow system is located in the upper strata of the aquifer system and can be seen within the shallow wells and springs. The intermediate flow system is located throughout the study area below the local flow system where most wells are extracting water from this system. The local and intermediate flow systems are localized in the terrigenous and volcanic units. The regional flow system is only in the volcanic unit that underlies the terrigenous unit. A few wells have come in contact with this system. A depletion trend shows that in the next few years this flow system will provide water to this zone. It was found that intensive extraction and the presence of geological faults favor the mixture of flows. Most of the water supply in the zone depends on the intermediate flow system. The static level in the zone descends 2.13 m/year. The flow direction of local and intermediate systems generally follows the topography of the zone, although there are local alterations due to the formation of depletion cones. Results indicate the need to implement strategies to avoid contaminating local flows and to reduce the water pressure derived from extraction toward the intermediate and regional systems.
  • First fossil record of a lapsiine (Araneae, Salticidae) in amber of
           Chiapas, Mexico

    • Abstract: Resumen Se reporta el primer lapsino (Salticidae: Spartaeinae) fosilizado en ámbar de Chiapas, México. Este espécimen es una nueva especie del actual género Galianora, con una edad de 23 Ma (Mioceno-Aquitaniano). Este es el primer lapsino en el registro fósil, el grupo aún no se ha registrado en la actual araneofuna chiapaneca. Este registro extiende el rango geográfico del género hacia el norte de la región Neotropical, con un representante fósil. Esta nueva especie, y los registros previos de salticidos para el ámbar mexicano, son consistentes con una radiación de Salticidae en el Neógeno, con implicaciones tanto Neárticas como Neotropicales. La presencia del género Galianora en el ámbar, predice su existencia en la actual fauna de Chiapas. Con base en el registro fósil se discute la idea de que probablemente los géneros de arañas, aparentemente extintos, aún permanecen en la región y posiblemente sobrevivieron a la evolución geológica de América Central. Se podría considerar que Chiapas fue, en su momento, un centro de origen para varias especies del órden Araneae; por lo cual, es necesario considerar la intensificación de estudios araneofaunísticos enfocados en analizar la riqueza y diversidad de arañas en Chiapas, considerando estudios filogenéticos (que incluyan taxones fósiles) para probar esta hipótesis. The first lapsine jumping spider (Salticidae: Spartaeinae) is recorded from Chiapas amber, Mexico. This specimen is a new fossil species belonging to the extant genus Galianora, with an age of 23 My (Miocene-Aquitanian). This is the first lapsine in the the fossil record, a group not previously recorded in the extant spider fauna from Chiapas. The geographical range of the genus extends towards the north of the Neotropical region thanks to this fossil representative. This new species, and previous records of salticids in Mexican amber, are consistent with a radiation of Salticidae in the Neogene, with both Neartic and Neotropical implications. The presence of Galianora in amber, predicts its presence in the extant Chiapas spider fauna. Based on the fossil record, it is possible that extinct genera of spiders may still remain in the region and probably survived the geological evolution of Central America. It is also possible that Chiapas was a center of origin for several species of Araneae; therefore, it is necessary to intensify araneofaunistic studies focused on analyzing the richness and diversity of spiders in Chiapas, using phylogenetic studies (including fossil taxa) to test this hypothesis.
  • Comparison between measurements of SO2 emission flux by means of COSPEC
           and MODIS, and their complementarity in the volcanic assessment: Case
           study in the Popocatépetl volcano (Mexico)

    • Abstract: Resumen Uno de los principales elementos monitoreado en las emisiones volcánicas es el SO2, debido al contraste en las concentraciones que emite un volcán comparado con el presente de fondo en la atmósfera. Se han desarrollado diferentes metodologías a partir de técnicas de percepción remota desde tierra y desde el espacio. En particular, la técnica COSPEC se ha utilizado eficientemente desde vehículos permitiendo la obtención de la tasa de emisión de SO2 con errores relativos estimados entre ±13% a ±42%. Sin embargo, la logística requerida para realizar campañas de medición continuas en la zona del Popocatépetl sólo permite la obtención de información 2 ó 3 veces al mes y sólo en horas con luz de día. Otro tipo de metodología es el procesamiento de imágenes satelitales en el infrarrojo térmico. En este caso, el uso de imágenes MODIS permite la obtención de información de SO2 diaria tanto en imágenes tomadas en horas con luz de día o durante el periodo de noche, lo que permite una resolución temporal máxima de dos imágenes por sensor en la zona de estudio (máximo 4 imágenes diarias). Con el propósito de utilizar información de ambas técnicas para la construcción de series de tiempo del comportamiento del flujo de SO2, se propone utilizar los valores de medición del sensor COSPEC como elemento de referencia y con esta información identificar dentro de la imagen MODIS la zona de la pluma que fue muestreada con COSPEC y con estos valores proponer una metodología de ajuste para la reconstrucción de la información. En el periodo de estudio (noviembre de 2006 a febrero de 2007) en el volcán Popocatépetl se presentó un buen ajuste entre las dos técnicas, lo que indica que la propuesta podría ser aplicada para la obtención de ecuaciones de calibración de datos en periodos en donde se cuente con datos simultáneos de los dos sensores. One of the main elements monitored in volcanic emissions is SO2 due to the contrast of concentrations between the volcanos compared to the background of the atmosphere. Different methodologies have been developed from remote sensing techniques from the ground and from space. In particular, the COSPEC technique has been used efficiently from terrestrial vehicles, allowing the emission rate of SO2 with estimated relative errors of ± 13% to ± 42% to be obtained. However, the logistics required to carry out continuous measurement campaigns in the Popocatepetl area, allows exclusively 2 or 3 measurements a month and only during daylight hours. Another type of methodology based on remote sensing is the processing of satellite images in the thermal infrared. In this case, the use of MODIS images allows obtaining daily SO2 information both in images taken at daylight hours or during the night period, which gives a maximum temporal resolution of images for the sensor in the study area (maximum 4 images per day). In order to construct time series from both techniques, the flux of SO2 derived from the COSPEC sensor are used as a reference, which allows the MODIS image identification within the area of the plume that was sampled with the COSPEC sensor. We aim to propose an adjustment methodology to reconstruct the information with the aforementioned values. Between November 2006 to February 2007 in the Popocatepetl volcano area, we found a good match between the two techniques, which indicates that the adjustment methodology proposal to obtain data calibration equations could be applied during periods of time when simultaneous data from both sensors are available.
  • Geochemistry of the Amazcala Caldera, Querétaro, Mexico: An unusual
           peralkaline center in the central Mexican Volcanic Belt

    • Abstract: The Amazcala caldera is 30 km northeast of Queretaro City, Mexico, in the central sector of the Mexican Volcanic Belt. It is 14 x 11 km in size and was active from 7.3 to 6.6 Ma. The first caldera event was the Ezequiel Montes Pumice, which was a widespread grey pumice-fall sequence of coarse to fine lapilli, with thicknesses from <1 to ~ 43 m. Colón ignimbrite was next in the evolution of the caldera and consisted mostly of dense pyroclastic density current deposits interbedded with pumice-fall lapilli and minor dilute pyroclastic density current deposits. Several rhyolitic domes form the rim of the caldera, some of which have associated pumice fall and pyroclastic density current deposits. The rim domes still preserve aphyric obsidian, named as Rim Dome Obsidian. A 4 x 2 km intra-caldera lava dome represents the last caldera event, but lacks preserved obsidian. All caldera products are peralkaline rhyolites with chemical characteristics of comendites. A correction of Na2O and K2O was necessary because of secondary hydration of glasses in pumice deposits. This correction process could also be applied in similar weathered or devitrified volcanic deposits at other localities. Al2O3, K2O, Fe2O3, and most REE (except La, Ce) and Y remain practically unchanged from the earliest caldera unit (Ezequiel Montes Pumice) to the last analyzed caldera unit (Rhyolitic Dome Obsidian), and Ba, Sr, La, P2O5 markedly decrease from Ezequiel Montes Pumice to Rhyolitic Dome Obsidia, whereas HFSE Th, Nb, Zr, and TiO2 slightly increase from Ezequiel Montes Pumice to Rhyolitic Dome Obsidian; that is, from pre-caldera collapse to post-caldera collapse. Comparing Amazcala units with calc-alkaline mafic lavas of the area, either pre- or post-caldera, HFSE, REE, and Th are markedly enriched in the Amazcala caldera products. In contrast, Ba, Sr, P2O5, and TiO2 are strongly depleted in the Amazcala units with respect to the mafic rocks. These data suggest a very efficient fractional crystallization process of possible parental mafic magmas. All caldera products are enriched in HFSE, LILE and REE, in particular Nb, Th, Zr and REE, suggesting an input from the fertile mantle during a pulse of continental intra-arc extension in the central sector of the Mexican Volcanic Belt. Amazcala caldera comendites have similar chemical signatures than other caldera comendites at extensional settings within the western sector of the Mexican Volcanic Belt, and with comendites within continental rifts, such as the Kenya rift in Africa.Resumen La caldera de Amazcala está ubicada a 30 km al NE de la Ciudad de Querétaro, México, en el sector central del Cinturón Volcánico Mexicano. Mide 14 x 11 km y estuvo activa entre 7.3 y 6.6 Ma. El primer evento de la caldera fue la erupción de la Pómez Ezequiel Montes, que consiste en una secuencia de depósitos de caída de lapilli grueso a fino de pómez gris con amplia distribución y espesores de < 1 a ~ 43 m. La ignimbrita Colón fue el siguiente evento en la evolución de la caldera y consiste sobre todo en depósitos de corrientes piroclásticas de densidad intercaladas con depósitos de caída de lapilli de pómez y de corrientes piroclásticas de densidad diluidos menores. Varios domos riolíticos forman el anillo de la caldera, algunos de ellos asociados a depósitos de caída de lapilli gruesos de pómez y de corrientes piroclásticas de densidad menores. Los domos del anillo aún conservan obsidiana afírica, roca que se denominó como Obsidiana de Domo del Anillo. El último evento de la caldera está representado por un gran domo de riolita intra-caldera de 4 x 2 km, pero sin obsidiana preservada. Todos los productos de la caldera son riolitas hiperalcalinas con características químicas de comenditas. Fue necesario realizar una corrección de Na2O y K2O por la hidratación secundaria en el vidrio de los depósitos de pómez. Esta corrección podría aplicarse en depósitos volcánicos similares, alterados o devitrificados de otros lugares. Al2O3 , K2O, Fe2O3 , y la mayoría de los REE (excepto La, Ce) e Y permanecen prácticamente sin cambio desde la primera unidad de la caldera (Pómez Ezequiel Montes) hasta la última unidad analizada (Domos de Obsidiana del Anillo), y Ba, Sr, La, P2O5 se empobrecen notoriamente de Pómez Ezequiel Montes a Domos de Obsidiana del Anillo, es decir, de antes del colapso caldérico a después del colapso. Comparando las unidades de Amazcala con lavas máficas del área, ya sean pre-caldera o post-caldera, HFSE, REE y Th están marcadamente enriquecidos en los productos de Amazcala. En contraste, Ba, Sr, P2O5 y TiO2 están fuertemente empobrecidos en las unidades de Amazcala con respecto a las rocas máficas. Estos datos sugieren un eficiente proceso de cristalización fraccionada de un posible magma parental máfico. Todos los productos de la caldera están enriquecidos en HFSE, LILE y REE, en particular Nb, Th, Zr y REE, sugiriendo una incorporación de magma proveniente del manto fértil durante un pulso de extensión intra-arco en el sector central del Cinturón Volcánico Mexicano. Las comenditas de la caldera de Amazcala poseen una firma química similar a la de comenditas de otras calderas en regímenes tectónicos extensionales en el Cinturón Volcánico Mexicano, y con comenditas de rift continentales como las del Rift de Kenia en África.
  • Comparative study of soil liquefaction potential using Spanish codes and
           the Eurocode

    • Abstract: Resumen La licuación es un proceso por el que una masa de suelo saturado, generalmente granular y de baja compacidad, disminuye drásticamente su resistencia por un aumento de su presión de poro, habitualmente asociado a cargas monotónicas o cíclicas, tales como las inducidas por los eventos sísmicos. Este efecto es recogido tanto por diversas normativas españolas como por el Anejo Nacional Español del Eurocódigo. En este trabajo se realiza un estudio comparativo sobre las diferencias y similitudes en la metodología de comprobación del potencial de licuación empleado en las diferentes normativas. Asimismo, con objeto de cuantificar las diferencias observadas, se ha determinado el factor de seguridad frente a la licuación para tres casos reales de suelos de la provincia de Alicante. En función de los resultados obtenidos se puede concluir que existen diferencias, en algunos casos significativas, en el factor de seguridad obtenido. Liquefaction is an effect for which a saturated soil suffers a severe loss of shear strength due to an increase of pore-water pressure. This effect, which generally affects loose granular soils, is usually produced by cyclic loading such as that the induced by earthquakes. In Spain, three different national standards plus Eurocode can currently be applied in the assessment of potential liquefaction of a soil site. In this research, a comparative study of the similarities and differences between these standards has been performed. Moreover, to improve understanding of the differences between standards, the factor of safety against liquefaction has been obtained for three real cases in the province of Alicante. According to the obtained results, it can be concluded that the safety factor can present significant differences depending on the code used.
  • First occurrence of Parksosauridae in Mexico, from the Cerro del Pueblo
           Formation (Late Cretaceous; late Campanian) at Las Águilas, Coahuila

    • Abstract: The Las Águilas locality near Porvenir de Jalpa, Coahuila, México, is extremely rich in fossil remains comprising both bones and trackways of several late Campanian dinosaur taxa. Here we present a tooth with an asymmetrically bulged crown and an isolated shallow amphicoelous vertebral centrum. Both are assigned by us to Parksosauridae. The material represents the first occurrence of this enigmatic family in México.Resumen La localidad de Las Águilas cerca de Porvenir de Jalpa, Coahuila, México, es extremadamente rica en restos de fósiles dinosaurios comprendiendo huesos y huellas de varios taxa Campanianos. Aquí presentamos el registro de un diente con una corona bulbosa y asimétrica además de un centrum de una vértebra anficélica. Ambos asignados por nosotros como Parksosauridae. El material representa el primer registro de esta enigmática familia para México.
  • First report of the rugose coral Hexagonaria davidsoni from the
           Khoshyeilagh Formation (Devonian), Alborz Mountains, Northeastern Iran

    • Abstract: The Middle to Late Devonian Khoshyeilagh Formation successions are here reported from the Khoshyeilagh neck, Alborz Mountains, Northeastern Iran. This formation is very fossiliferous. The rugose coral Hexagonaria davidsoni occurs within Frasnian strata and is the first report of this species from the Khoshyeilagh Formation.Resumen En este trabajo se reportan las secuencias del Devónico Medio a Tardío de la Formación Khoshyeilagh en el cuello de Khoshyeilagh. Dicha formación es muy fosilífera en el área estudiada. La especie de coral rugoso Hexagonaria davidsoni de los estratos del Frasniense de esta formación es el primer reporte de esta especie en el Devónico de Irán y se describe aquí sistemáticamente.
  • Occurrence of Plagiobrissus grandis (Gmelin, 1788) (Echinoidea:
           Spatagoida) in the Tuxpan Formation, Miocene (Langhian) in northem
           Veracruz state, Mexico. Biogeographic considerations

    • Abstract: Resumen Se reporta la presencia de Plagiobrissus grandis en una localidad del Mioceno medio (Langhiano) de la Formación Tuxpan en la región de Papantla-Martínez de la Torre, norte de Veracruz. Tal hallazgo permite analizar el patrón de distribución espacio-temporal del género, corrobora su origen durante el Eoceno en el Caribe y su posterior dispersión en el Mioceno que le permitió aumentar su rango de distribución hasta Carolina del Norte en los Estados Unidos y las costas de Venezuela y Brasil. La formación del Istmo de Panamá, y con ello el cierre de la conexión con el Pacífico durante el Mioceno-Plioceno, desencadenó grandes cambios en las corrientes del Atlántico Norte, favoreciendo, entre el Mioceno tardío y el presente, la dispersión del género hacia el Mediterráneo y las costas del Norte de África, hasta el Golfo de Guinea. La evidencia de Plagiobrissus grandis en el Mioceno medio y su existencia en el Reciente, da un ejemplo de la longevidad que presentan diversas especies de equinoideos. The presence of Plagiobrissus grandis is reported in a locality of the middle Miocene (Langhiano) of the Tuxpan Formation in the Papantla-Martínez de la Torre region, North of Veracruz. The finding allows to analyze the space-time distribution of the genus, and corroborates its origin in the Caribbean during Eocene times, as well as its later dispersion during the Miocene to North Carolina in the United States and the coasts of Venezuela and Brazil. The division of the Pacific and the Atlantic oceans during the Miocene-Pliocene, by the emergence of the Panama Isthmus, triggered great changes in the marine currents of the North Atlantic; that event favored the dispersion of the genus from the Miocene to the Recent towards the Mediterranean and the coasts of North Africa, to the Gulf of Guinea. The finding of Plagiobrissus grandis in the middle Miocene and its survival until the present provides an example of the longevity of several echinoid species.
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