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ECONOMIC SCIENCES: GENERAL (212 journals)                  1 2     

Showing 1 - 200 of 200 Journals sorted alphabetically
ACM Transactions on Economics and Computation     Hybrid Journal  
Acta Universitatis Lodziensis : Folia Oeconomica     Open Access  
Acta Universitatis Sapientiae, Economics and Business     Open Access   (Followers: 1)
Actualidad Económica     Open Access  
Advances in Management and Applied Economics     Open Access   (Followers: 8)
AFFRIKA Journal of Politics, Economics and Society     Full-text available via subscription   (Followers: 4)
African Journal of Economic and Management Studies     Hybrid Journal   (Followers: 10)
Agricultural and Food Economics     Open Access   (Followers: 7)
AgriEngineering     Open Access  
Agrosearch     Open Access  
AL-Qadisiyah Journal For Administrative and Economic sciences     Open Access   (Followers: 2)
American Economic Review     Full-text available via subscription   (Followers: 443)
American Journal of Economics     Open Access   (Followers: 15)
Análisis Economico     Open Access  
Annales Universitatis Mariae Curie-Skłodowska, sectio H – Oeconomia     Open Access  
Annals of Financial Economics     Hybrid Journal   (Followers: 1)
Annals of Spiru Haret University. Economic Series     Open Access  
Applied Economic Analysis     Full-text available via subscription   (Followers: 1)
Applied Economic Perspectives and Policy     Hybrid Journal   (Followers: 15)
Applied Economics and Finance     Open Access   (Followers: 9)
Arthaniti : Journal of Economic Theory and Practice     Full-text available via subscription  
Asia-Pacific Journal of Accounting & Economics     Hybrid Journal   (Followers: 6)
Asian Journal of Economics and Empirical Research     Open Access  
Baltic Journal of Economics     Open Access   (Followers: 1)
BISE : Jurnal Pendidikan Bisnis dan Ekonomi     Open Access  
Botswana Journal of Economics     Open Access   (Followers: 1)
BRICS Journal of Economics     Open Access   (Followers: 2)
BRQ Business Review Quarterly     Open Access   (Followers: 1)
Buletin Studi Ekonomi     Open Access   (Followers: 2)
Business Strategy and Development     Hybrid Journal  
Central European Economic Journal     Open Access  
China Economic Quarterly International     Open Access  
China Finance and Economic Review     Open Access   (Followers: 4)
Ciencias Económicas     Open Access  
Cliodynamics     Open Access   (Followers: 2)
Cogent Economics & Finance     Open Access   (Followers: 3)
Danube     Open Access   (Followers: 3)
Desarrollo y Sociedad     Open Access   (Followers: 1)
Divergencia     Open Access  
ECA Sinergia : Revista Especializada en Economía, Contabilidad y Administración     Open Access  
Economía     Open Access  
EconomiA     Open Access  
ECONOMÍA     Open Access  
Economia & Região     Open Access   (Followers: 1)
Economic Analysis of Law Review     Open Access   (Followers: 4)
Economic Geology     Hybrid Journal   (Followers: 7)
Económicas CUC     Open Access  
Economics : Journal for Economic Theory and Analysis     Open Access   (Followers: 4)
Economics : The Open-Access, Open-Assessment Journal     Open Access  
Economics and Culture     Open Access  
Economics and Policy of Energy and the Environment     Full-text available via subscription   (Followers: 13)
Economics of Transportation     Partially Free   (Followers: 16)
Economy     Open Access   (Followers: 1)
Economy and Sociology / Economie şi Sociologie     Open Access   (Followers: 1)
Econosains : Jurnal Online Ekonomi Dan Pendidikan     Open Access  
Edunomic Jurnal Pendidikan Ekonomi     Open Access  
EFB Bioeconomy Journal     Open Access  
Ekonomi Bilimleri Dergisi     Open Access  
Ekonomia i Zarzadzanie. Economics and Management     Open Access  
Ekonomika (Economics)     Open Access  
Ekuilibrium : Jurnal Ilmiah Bidang Ilmu Ekonomi     Open Access  
Ekuitas : Jurnal Ekonomi dan Keuangan     Open Access  
El Trimestre Económico     Open Access  
Ensayos de Política Económica     Open Access  
Environmental & Socio-economic Studies     Open Access   (Followers: 1)
Environmental Economics     Open Access   (Followers: 2)
Equilibrium : Quarterly Journal of Economics and Economic Policy     Open Access   (Followers: 1)
Espacio Abierto     Open Access  
Estudios de Economia Aplicada / Studies of Applied Economics     Open Access   (Followers: 1)
Estudios Economicos     Open Access  
Expert Journal of Economics     Open Access  
Expresión Económica : Revista de Análisis     Open Access  
Global Business Perspectives     Hybrid Journal   (Followers: 3)
Health Economics Review     Open Access   (Followers: 9)
IMF Economic Review     Hybrid Journal   (Followers: 44)
Indian Growth and Development Review     Hybrid Journal  
Informe Econômico     Open Access   (Followers: 3)
Insight on Africa     Hybrid Journal   (Followers: 3)
Intellectual Economics     Open Access  
Interfaces Brasil/Canadá     Open Access   (Followers: 1)
International Journal of Applied Behavioral Economics     Full-text available via subscription   (Followers: 18)
International Journal of Ecological Economics and Statistics     Full-text available via subscription   (Followers: 4)
International Journal of Economics and Finance     Open Access   (Followers: 12)
International Journal of Economics and Financial Issues     Open Access   (Followers: 10)
International Journal of Energy Economics and Policy     Open Access   (Followers: 11)
International Journal of Management and Economics     Open Access   (Followers: 2)
International Journal of Regional Development     Open Access   (Followers: 1)
International Quarterly for Asian Studies     Open Access   (Followers: 2)
International Review of Economics Education     Hybrid Journal   (Followers: 2)
IQTISHODUNA     Open Access  
Istanbul Journal of Economics     Open Access  
Italian Economic Journal     Hybrid Journal   (Followers: 34)
JEJAK : Jurnal Ekonomi dan Kebijakan     Open Access  
JEKPEND : Jurnal Ekonomi dan Pendidikan     Open Access  
Journal for Labour Market Research     Open Access   (Followers: 11)
Journal of Accounting and Finance in Emerging Economies     Open Access  
Journal of Advanced Research in Law and Economics     Open Access   (Followers: 1)
Journal of Advanced Studies in Finance     Open Access   (Followers: 3)
Journal of Business Economics and Management     Open Access   (Followers: 2)
Journal of Business-to-Business Marketing     Hybrid Journal   (Followers: 13)
Journal of Developing Economies     Open Access   (Followers: 4)
Journal of Development Policy and Practice     Hybrid Journal   (Followers: 3)
Journal of Economic and Financial Sciences     Open Access   (Followers: 1)
Journal of Economic Asymmetries     Open Access  
Journal of Economic Development Policy     Open Access   (Followers: 7)
Journal of Economics and International Finance     Open Access   (Followers: 1)
Journal of Economics and Sustainable Development     Open Access   (Followers: 14)
Journal of Economics Bibliography     Open Access  
Journal of Economics Library     Open Access   (Followers: 8)
Journal of Economics, Finance and Administrative Science     Open Access  
Journal of Economics, Race, and Policy     Hybrid Journal   (Followers: 3)
Journal of Economy Culture and Society     Open Access  
Journal of Entrepreneurship and Public Policy     Hybrid Journal   (Followers: 7)
Journal of Finance and Economics     Open Access   (Followers: 13)
Journal of Financial and Quantitative Analysis     Full-text available via subscription   (Followers: 55)
Journal of Financial Economic Policy     Hybrid Journal   (Followers: 1)
Journal of Government and Economics     Open Access  
Journal of Interdisciplinary Economics     Hybrid Journal   (Followers: 1)
Journal of Life Economics     Open Access   (Followers: 2)
Journal of Management Control     Hybrid Journal   (Followers: 3)
Journal of Management for Global Sustainability     Open Access   (Followers: 1)
Journal of Markets & Morality     Partially Free  
Journal of Poverty and Social Justice     Hybrid Journal   (Followers: 33)
Journal of Research in Economics     Open Access   (Followers: 2)
Journal of Reviews on Global Economics     Open Access  
Journal of the Economic Science Association     Hybrid Journal   (Followers: 1)
Journal of the Economics of Ageing     Hybrid Journal   (Followers: 1)
Jurnal Ekonomi dan Studi Pembangunan     Open Access  
Jurnal Ekonomi KIAT     Open Access  
Jurnal Ekonomi Modernisasi     Open Access   (Followers: 1)
Jurnal Ekonomi Pembangunan     Open Access  
Jurnal Manajemen dan Kewirausahaan     Open Access  
Jurnal Pendidikan Ekonomi     Open Access  
Klinik Einkauf     Hybrid Journal  
Korea : Politik, Wirtschaft, Gesellschaft     Open Access  
L'Actualité économique     Full-text available via subscription   (Followers: 2)
Latin American Journal of Economics     Open Access   (Followers: 1)
Lecturas de Economía     Open Access  
Liberal Arts and Social Sciences International Journal (LASSIJ)     Open Access   (Followers: 1)
List Forum für Wirtschafts- und Finanzpolitik     Hybrid Journal  
Local Economy     Hybrid Journal   (Followers: 3)
Low Carbon Economy     Open Access   (Followers: 4)
Management Dynamics     Open Access  
Media Ekonomi dan Manajemen     Open Access  
MediaTrend     Open Access  
Modern Economy     Open Access   (Followers: 3)
Mondes en développement     Full-text available via subscription  
NBER Working Paper Series     Full-text available via subscription   (Followers: 21)
Nordic Journal of Health Economics     Open Access   (Followers: 4)
Open Pharmacoeconomics & Health Economics Journal     Open Access  
Pensamiento Crítico     Open Access  
Proceedings of Voronezh State University. Series: Economics and Management     Open Access  
Quantitative Economics     Full-text available via subscription   (Followers: 13)
Quantitative Economics Research     Open Access  
Quarterly Journal of Applied Theories of Economics     Open Access  
RDE : Revista de Desenvolvimento Econômico     Open Access  
Regards économiques     Open Access  
Regional Research of Russia     Hybrid Journal   (Followers: 4)
Regional Science Policy & Practice     Hybrid Journal   (Followers: 2)
Research in World Economy     Open Access   (Followers: 3)
Review of Economics and Development Studies     Open Access   (Followers: 2)
Review of Economics and Institutions     Open Access   (Followers: 3)
Review of Economics and Statistics     Hybrid Journal   (Followers: 138)
Review of Market Integration     Hybrid Journal   (Followers: 2)
Revista Brasileira de Desenvolvimento Regional     Open Access  
Revista CIFE : Lecturas de Economía Social     Open Access  
Revista de Análisis Económico     Open Access  
Revista de Economía     Open Access  
Revista ECONO : Facultad de Ciencias Económicas. UNLP     Open Access  
Revista Economia & Gestão     Open Access  
Revista Facultad de Ciencias Económicas: Investigación y Reflexión     Open Access  
Revista Finanzas y Política Económica     Open Access  
Revista Icade. Revista de las Facultades de Derecho y Ciencias Económicas y Empresariales     Full-text available via subscription  
Revista Latinoamericana de Desarrollo Económico     Open Access  
Revista Panorama Económico     Open Access   (Followers: 1)
Revista Sociedad y Economía     Open Access  
Revista Teoria e Evidência Econômica     Open Access  
Revista U.D.C.A Actualidad & Divulgación Científica     Open Access  
Revue économique     Full-text available via subscription   (Followers: 3)
Ruch Prawniczy, Ekonomiczny i Socjologiczny     Open Access  
RUDN Journal of Economics     Open Access  
Russian Journal of Economics     Open Access  
Sdü Vizyoner Dergisi     Open Access  
Semestre Económico     Open Access  
Shanlax International Journal of Economics     Open Access  
Sosyoekonomi     Open Access  
Staff Studies : Central Bank of Sri Lanka     Open Access  
Statistics and Economics     Open Access  
Studia Universitatis ?Vasile Goldis? Arad ? Economics Series     Open Access  
Supreme Court Economic Review     Full-text available via subscription   (Followers: 3)
Swiss Journal of Economics and Statistics     Open Access  
Tahghighat-e-Eghtesadi     Open Access  
Textos de Economia     Open Access  
Theoretical Economics Letters     Open Access   (Followers: 2)
Torun International Studies     Open Access  
Turkish Economic Review     Open Access  
World Economics     Full-text available via subscription   (Followers: 8)
Wroclaw Review of Law, Administration & Economics     Open Access  
Œconomia     Open Access  
Науковий вісник НУБіП України. Серія: Економіка, аграрний менеджмент, бізнес     Open Access  

        1 2     

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Economic Geology
Number of Followers: 7  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0361-0128 - ISSN (Online) 1554-0774
Published by Society of Economic Geologists Homepage  [1 journal]
  • Geochemical Data Analysis of Iron Oxide Copper-Gold Mineralization, Wirrda
           Well Prospect, South Australia

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      Authors: Dmitrijeva M; Ciobanu CL, Ehrig K, et al.
      Abstract: AbstractMultivariate statistical analysis encompasses a range of methods that can fingerprint mineralization, alteration, and host-rock signatures within an ore system, thus assisting in interpretation of ore deposit models and supporting exploration programs. We utilize numeric interpolation of metals (Fe, Cu, and U), principal component analysis (PCA), and a Random Forest (RF) classification, applied to whole-rock geochemical data, to define metal distribution patterns and geochemical signatures of alteration/Fe oxide mineralization in the Wirrda Well iron oxide copper-gold (IOCG) prospect. The prospect is located in the Olympic Dam district, Gawler Craton (South Australia), bounded by NW- and NE-trending faults and characterized by two distinct residual gravity anomalies: Wirrda Well North (WW-North) and Wirrda Well South (WW-South). The mineralization is attributed to hydrothermal activity associated with magmatism at ~1.6 Ga that generated the Gawler Silicic Large Igneous Province (SLIP), corroborated by U-Pb dates of hematite. The mineralization is hosted by the ~1.85 Ga Donington Granitoid Suite and abundant mafic dikes, the majority of which are considered to predate mineralization.Five lithogeochemical clusters are defined from PCA, hierarchical, and k-means clustering, efficiently discriminating least-altered felsic lithologies from altered, mixed lithologies (felsic and mafic) and, importantly, two distinct mineralization clusters, representing magnetite and hematite. The RF method is successfully applied to a larger data set with a smaller number of analyzed elements to extrapolate the results over the whole prospect. WW-North is characterized by an Fe-V-Ni-Co signature defined as “magnetite-type,” whereas WW-South contains higher-grade Cu-Au(± Bi-Ag) mineralization and has a marked Mo-W-U(± Sn) signature defined as “hematite-type.” The latter is considered a characteristic hypogene hydrothermal signature in the Olympic Dam District. Sodic and hydrolytic alteration are associated with Fe metasomatism and are depicted by the magnetite and hematite clusters, respectively. In combination, the results indicate that premineralization mafic dikes provided permeable structures for fluid focusing and metal deposition, since metals are concentrated by their contacts with host granite, specifically in WW-North. The metal interpolations and geochemical data analysis suggest strong lithological-structural control on IOCG mineralization at Wirrda Well.
      PubDate: Wed, 01 Jun 2022 00:00:00 GMT
       
  • NEW 40 Ar/ 39 Ar DATING OF ALUNITE FROM THE CERRO QUEMA Au-Cu DEPOSIT,
           AZUERO PENINSULA, PANAMA—A DISCUSSION ON THE BASIS OF NEW U-Pb (ZIRCON)
           DATA

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      Authors: Perelló J; Nelson CE, Valencia VA.
      PubDate: Wed, 01 Jun 2022 00:00:00 GMT
       
  • U-Pb GEOCHRONOLOGY AND MINERALOGY OF HEMATITE FROM MANTOVERDE AND CARMEN
           DE COBRE, NORTHERN CHILE: CONSTRAINTS ON ANDEAN IOCG MINERALIZATION

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      Authors: Verdugo-Ihl MR; Ciobanu CL, Courtney-Davies L, et al.
      Abstract: AbstractThe first U-Pb hematite dates are reported for the Mantoverde and Carmen de Cobre iron oxide copper-gold (IOCG) deposits in the northern segment of the Coastal Cordillera, Chile. Samples contain low U, low radiogenic Pb, and relatively high common Pb components. Nevertheless, laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) data, normalized using a newly developed hematite reference material, yield intercept dates of 108.01 ± 2.25/4.69/6.66 Ma at Carmen de Cobre and 105.61 ± 6.71/14/19.39 Ma at Mantoverde (uncertainties at 2σ given as analytical/+95% confidence interval/+factor of mean square of weighted deviates [MSWD]).Complementary micron- to nanoscale mineralogical characterization of hematite in the two IOCG systems was conducted to understand the formation conditions of hematite and assess the implications of obtained ages. The dated hematite is Ti-rich (up to 10.8 mol % ilmenite; ~Fe1.89Ti0.11O3) but lacks ilmenite exsolutions. This implies minimum crystallization temperatures of ~500°C, above the solvus of the FeTiO3-Fe2O3 system, supporting a magmatically derived fluid source. Nanometer-scale, K-Si-Al-Cl–bearing inclusions in hematite suggest an alkali alteration event during hematite formation. Alongside measurable U, the Ti-bearing hematite also contains growth zones with W and Sn, elements which are part of a “granitophile” signature analogous to that reported from IOCG systems elsewhere, notably in the Gawler craton, South Australia. Apart from some older IOCGs north of Taltal, the IOCG deposits in Northern Chile are considered to have been formed between ~125 and 110 Ma. Younger published dates, similar to those determined here for Mantoverde and Carmen de Cobre, overlap with those from younger porphyry systems following a shift from transpressional to contractional tectonics. These new dates support an interpretation in which Carmen de Cobre belongs to a younger episode (≲100 Ma) of IOCG mineralization in the area, whereas the new date for Mantoverde, coupled with published data, could indicate superposition of several mineralizing events. At Carmen de Cobre, the dated Ti-bearing hematite is younger than the spatially associated, crosscut magnetite bodies. Systematic application of hematite geochronology can play an important role in constraining the timing of IOCG mineralization along the Coastal Cordillera in the context of panregional metallogeny and temporal development of the Atacama Fault System, its subordinate structures, and associated magmatism. Our data suggest that the IOCG deposits studied are unrelated to andesitic melts, but they could be related to more evolved granitic melts.
      PubDate: Wed, 01 Jun 2022 00:00:00 GMT
       
  • NEW 40 Ar/ 39 Ar DATING OF ALUNITE FROM THE CERRO QUEMA Au-Cu DEPOSIT,
           AZUERO PENINSULA, PANAMA—A REPLY TO THE COMMENT OF PERELLÓ ET AL.
           (2022) ON THE BASIS OF NEW U-Pb AND Lu-Hf (ZIRCON), AND WHOLE-ROCK
           GEOCHEMICAL DATA

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      Authors: Corral I.
      PubDate: Wed, 01 Jun 2022 00:00:00 GMT
       
  • ORIGIN OF HIGH-Ti MAGNETITE IN MAGMATIC-HYDROTHERMAL SYSTEMS: EVIDENCE
           FROM IRON OXIDE-APATITE (IOA) DEPOSITS OF EASTERN CHINA

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      Authors: Zeng L; Zhao X, Spandler C, et al.
      Abstract: AbstractMagnetite chemistry has been widely used to distinguish igneous versus hydrothermal origins for a range of magnetite-bearing mineral deposits. However, the origin of Ti-rich magnetite with ilmenite lamellae from iron oxide-apatite (IOA) deposits and other magmatic-hydrothermal systems remains highly debated. In this study, we present petrographic, textural, and elemental data for magnetite in disseminated, brecciated, massive, and vein ores from the Washan and Taocun IOA deposits of Eastern China to constrain the physicochemical parameters (i.e., temperature, oxygen fugacity, and coexisting fluid compositions) of magnetite formation and evolution in magmatic-hydrothermal systems.Two types of magnetite, primary high-Ti magnetite (1.49–4.89 wt % Ti) and secondary low-Ti magnetite (mostly <1 wt % Ti), have been widely identified in different types of ores. Primary high-Ti magnetite contains abundant, well-developed ilmenite lamellae that formed during oxy-exsolution processes at temperatures >550°C. Field and microscopic evidence suggest that this magnetite was coeval with or slightly later than a hydrothermal mineral assemblage of albite, fluorapatite, and actinolite. This type of magnetite has a minor/trace element (e.g., Ti, Al, V, Cr, Ni, and Co) composition that is distinct from typical igneous magnetite. We propose that the primary high-Ti magnetite crystallized from high-temperature, Fe-bearing hydrosaline liquids and present new criteria for discriminating high-Ti hydrothermal magnetite from igneous magnetite based on Cr, Co + Ni, and Ti + V + Al systematics (as determined by laser ablation-inductively coupled plasma-mass spectrometry [LA-ICP-MS]). The high-Ti magnetite grains have subsequently undergone variable degrees of coupled dissolution-reprecipitation to produce trace element-deficient, low-Ti magnetite and newly formed titanite and rutile. This study highlights that high-Ti magnetite can precipitate from high-temperature hydrosaline liquids, which has implications in the evolution of IOA deposits and other magmatic-hydrothermal systems.
      PubDate: Wed, 01 Jun 2022 00:00:00 GMT
       
  • Interesting Papers in Other Journals

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      PubDate: Wed, 01 Jun 2022 00:00:00 GMT
       
  • Rare Earth Element Enrichment in the Weathering Profile of the Bull Hill
           Carbonatite at Bear Lodge, Wyoming, USA

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      Authors: Hutchinson M; Slezak P, Wendlandt R, et al.
      Abstract: AbstractBull Hill is a carbonatite diatreme within the Paleogene Bear Lodge Carbonatite Complex in Wyoming, USA. Rare earth element (REE)-bearing carbonate, fluorocarbonate, phosphate, and oxide minerals occur within near-vertical carbonatite dikes on the western margin of Bull Hill. Changes in mineralogy and REE concentrations with depth are ascribed mainly to late-stage magmatic-hydrothermal and supergene alteration. Approximately 35 m of drill core from Bull Hill was analyzed and encompasses least altered, weakly weathered, and moderately weathered carbonatite. The least altered carbonatite contains magmatic burbankite, typically as inclusions within Mn-rich calcite (stage I). Secondary REE-bearing minerals, which pseudomorphically replaced unidentified hexagonal phenocrysts, include ancylite, bastnäsite with synchysite/parisite, and an unidentified Sr-Ca-REE-phosphate (stage II). These replacive minerals generated small amounts of incipient porosity (~7–8%) and are largely stable in the lower portion of the weathering profile. Progressive weathering (stages III and IV) of the carbonatite involved the oxidation of pyrite to iron oxides and iron hydroxides, dissolution of calcite and strontianite, and the replacement of Mn-rich calcite by manganese oxides. These mineralogical changes resulted in an ~40% porosity gain in the core studied here. The volumetric concentration of weathering resistant REE-bearing minerals resulted in REE enrichment from an average of 5.4 wt % in the least weathered carbonatite to an average of 12.6 wt % in moderately weathered carbonatite, and to an overall increase in REE ore tenor of two to three times compared to the least altered carbonatite. Isocon plots confirm the increased concentration of REEs in the weathered carbonatite and demonstrate that REEs, along with TiO2, Ta, Nb, Zr, and Hf, were conserved in the lower weathered zone.
      PubDate: Wed, 01 Jun 2022 00:00:00 GMT
       
  • Detecting Buried Porphyry Cu Mineralization in a Glaciated Landscape: A
           Case Study from the Gibraltar Cu-Mo Deposit, British Columbia, Canada

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      Authors: Plouffe AA; Kjarsgaard IM, Ferbey TT, et al.
      Abstract: AbstractAt the Gibraltar porphyry Cu-Mo deposit in south-central British Columbia, Canada, geochemical and mineralogical anomalies in till around a cluster of mineral occurrences form amoeboid-shaped dispersal patterns controlled by three phases of ice movement. The glacial dispersal patterns defined by elevated concentrations of ore (Cu, Mo) and pathfinder (Ag, Zn) elements and alteration oxides (Al2O3, K2O) in the till matrix (clay and silt plus clay fractions) extend over areas of 6–36 km2 and are centered on the main economic mineralization. Mineralogical dispersal trains were identified by the high abundances of chalcopyrite, pyrite, jarosite, titanite, and epidote, which were derived from the mineralization and its associated oxidation and alteration zones. These mineralogical anomalies in till extend approximately 30 km2 for chalcopyrite, 62 km2 for jarosite, and up to 136 km2 for epidote. Epidote grains in till with a trace element composition of >10 ppm As, >4 ppm Sb, <200 ppm total rare earth elements (ΣREEs), <45 ppm Y, <100 ppm Sc + Cr + Y, and/or <2 ppm Th + Hf are interpreted as being either principally derived from the intrusive rocks or from hydrothermal alteration of the porphyry mineralization. Rare epidote grains with >30 ppm Cu, interpreted to be related to the porphyry Cu mineralization, were detected in till up to 7 km down-ice from the economic mineralization. This study demonstrates that till geochemistry and mineralogy, combined with geochemical analyses of specific minerals such as epidote, are efficient methods for identifying porphyry Cu mineralization in terrains covered by glacial sediments.
      PubDate: Wed, 01 Jun 2022 00:00:00 GMT
       
  • U-Pb VEIN CALCITE DATING REVEALS THE AGE OF CARLIN-TYPE GOLD DEPOSITS OF
           CENTRAL YUKON AND A CONTEMPORANEITY WITH A REGIONAL INTRUSION-RELATED
           METALLOGENIC EVENT

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      Authors: Pinet N; Davis WJ, Petts DC, et al.
      Abstract: AbstractLaser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb dating of hydrothermal calcite associated with the waning stage of mineralization is used to constrain the age of Neoproterozoic-hosted Carlin-type gold deposits in central Yukon, Canada. Samples exhibiting minor textural complexity show low dispersion of individual spot analyses and define Tera-Wasserburg lower intercept ages between 75.1 ± 2.5 and 71.2 ± 4.3 Ma. Samples with U-rich microfractures and/or a second generation of calcite associated with vein reopening record the primary stage of calcite growth related to hydrothermal activity at ca. 74 Ma and a younger ca. 48 Ma event related to fluid-assisted U mobility. The minimum age for mineralization at ca. 74 Ma overlaps with a maximum age based on a zircon U-Pb date of 74.1 ± 1.0 Ma for a gabbro dike that is locally altered and mineralized. These time constraints indicate that mineralization is ca. 74 Ma and penecontemporaneous with dike emplacement. Furthermore, mineralization is contemporaneous with a regional gold-bearing, intrusion-related, metallogenic event in eastern Alaska and central Yukon. This temporal link between Carlin-type mineralization and other mineralization types bears similarities with world-class sedimentary rock-hosted gold deposits of Nevada. This study demonstrates the potential of using LA-ICP-MS U-Pb dating on calcite to constrain the age of mineral deposits lacking synmineralization minerals amenable to classic dating techniques.
      PubDate: Wed, 01 Jun 2022 00:00:00 GMT
       
  • Yukon’s Carlin-Type Gold Deposits (Rackla Belt, Canada): Main
           Characteristics and New Insights on Alteration Styles and Geochemistry

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      Authors: Pinet N; Sack P, Mercier-Langevin P, et al.
      Abstract: AbstractIn central Yukon, the Neoproterozoic to Carboniferous complexly deformed Rackla belt is along the northern boundary of the Selwyn basin. Toward the eastern end of the Rackla belt, a series of gold deposits in the Nadaleen trend exhibit similarities with Carlin-type deposits of the southwestern United States and may represent some of the best examples of this type of mineralization outside Nevada. These replacement-style gold deposits are hosted in two Neoproterozoic carbonate-dominated intervals and in a Paleozoic siltstone/mudstone unit at the contact with less permeable strata. In Neoproterozoic-hosted deposits, mineralized zones are grossly concordant with bedding. Favorable host rocks (including sedimentary units formed through debris flows) form complexly shaped faulted anticlines that constituted mixed stratigraphic/structural traps for mineralizing fluids. This and the association of gold with arsenic-rich pyrite, the common occurrence of realgar/orpiment, alteration styles dominated by decarbonatization of impure carbonate rocks, late Au-stage calcite characterized by a depleted δ18O signature, the very low base metal content and Ag/Au ratio, and enrichment in a series of diagnostic pathfinder elements (Hg, Tl ± Sb, As) are among the key features that are consistent with classification of the eastern Rackla belt as a Carlin-type district.Mineralization style varies significantly at the centimeter to 10-m scale, indicating that mineralizing fluids exploited permeable pathways, regardless of their sedimentary and/or tectonic origin. Alternating finely laminated limestone, siltstone, and floatstone intervals are the dominant host rocks to mineralization in the Conrad, Sunrise, and Osiris deposits. Premineralization fractures acted as feeders for selective bed replacement, and premineralization calcite vein networks, preferentially dissolved by early acidic fluids, acted as conduits to later gold-bearing fluids. Limited evidence suggests that synmineralization deformation was relatively minor and possibly dominated by oblique strike-slip faulting.
      PubDate: Wed, 01 Jun 2022 00:00:00 GMT
       
  • U-Pb and Sm-Nd Evidence for Episodic Orogenic Gold Mineralization in the
           Kalgoorlie Gold Camp, Yilgarn Craton, Western Australia

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      Authors: McDivitt JA; Hagemann SG, Kemp AS, et al.
      Abstract: AbstractDifferent genetic and timing models for gold mineralization in the Kalgoorlie gold camp (Yilgarn craton, Western Australia) suggest either broadly synchronous, late-stage mineralization related to metamorphic fluids at ca. 2640 Ma or a punctuated mineralization history from ca. 2675 to 2640 Ma with the involvement of early magmatic-hydrothermal systems (represented by the Fimiston, Hidden Secret, and Oroya gold-telluride lodes) and late metamorphic fluids (represented by the Mt. Charlotte gold stockwork veins). The results of U-Pb and Sm-Nd geochronological studies of zircon, apatite, and titanite from pre-ore dikes and syn-ore dikes constrain the absolute timing of mineralization and provide new evidence to this timing controversy. Emplacement ages constrained by U-Pb sensitive high-resolution ion microprobe (SHRIMP) zircon data are interpreted to be similar for both the pre-ore dikes (n = 10) and syn-ore dikes (n = 7) at ca. 2675 Ma. An inferred emplacement age of ca. 2675 Ma for the syn-ore dikes is supported by a Sm-Nd isochron age from apatite (laser ablation-inductively coupled plasma-mass spectrometry; LA-ICP-MS) of 2678 ± 15 Ma and by a U-Pb titanite age (LA-ICP-MS) of 2679 ± 6 Ma. The results of chemical abrasion-isotope dilution-thermal ionization mass spectrometry U-Pb zircon analysis from the pre- and syn-ore dikes are complicated by multistage Pb loss, reverse discordance, and potential inheritance. However, the data are compatible with the emplacement of Fimiston/Hidden Secret gold mineralization at ca. 2675 Ma and suggest a younger age for Oroya mineralization at ca. 2665 Ma. These results contrast with models for orogenic gold deposits that invoke broadly synchronous, late-stage mineralization related to metamorphic fluids at ca. 2640 Ma. The bulk of the Kalgoorlie gold camp’s estimated 2,300 t Au endowment was emplaced at ca. 2675 Ma as Fimiston/Hidden Secret Au mineralization. This early Au mineralization was deformed and overprinted twice by subordinate Au mineralization at ca. 2665 (Oroya mineralization) and ca. 2640 Ma (Mt. Charlotte mineralization). Gold mineralization in the Kalgoorlie gold camp was protracted in nature from ca. 2675 to 2640 Ma and reflects the interplay of early magmatic (Fimiston, Hidden Secret, Oroya) and late metamorphic (Mt. Charlotte) hydrothermal fluid systems in the formation of hybrid intrusion-related and metamorphic orebodies.
      PubDate: Wed, 01 Jun 2022 00:00:00 GMT
       
  • Laboratory-Based Bacterial Weathering of the Merensky Reef and Its Impact
           on Platinum Group Mineral Migration

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      Authors: Tan L; Jones T, Xie J, et al.
      Abstract: AbstractWeathering of the Merensky reef was enhanced under laboratory conditions by Fe- and S-oxidizing bacteria: Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans, and Leptospirillum ferrooxidans. These bacteria preferentially colonized pyrrhotite and pyrite, versus pentlandite and chalcopyrite (all of which were common within the rock substrate), promoting weathering. Weathering of base metal sulfides resulted in the precipitation of Fe oxides, Fe phosphate, and elemental sulfur as secondary minerals. Fe pyroxene weathered readily under acidic conditions and resulted in mineral dissolution, while other silicates (orthopyroxene and plagio-clase) precipitated Fe phosphate spherules or coatings on their surface. The deterioration of the platinum group metal (PGM) matrix (base metal sulfides and silicates) and the occurrence of a platinum grain associated with platinum nanoparticles observed in the biotic thin sections demonstrate that biogeochemical acid weathering is an important step in the active release of intact PGM grains. A platinum grain embedded in secondary Fe oxides/phosphate that had settled by gravity within the weathering solution demonstrates that secondary minerals that formed during weathering of PGM-hosting minerals also represent targets in PGM exploration by trapping and potentially slowing PGM migration. Dispersion halos surrounding or occurring downstream from PGM occurrences will likely produce two physical target classes—i.e., grains and colloids—under surficial weathering conditions.
      PubDate: Wed, 01 Jun 2022 00:00:00 GMT
       
  • Well-Constrained Mineralization Ages by Integrated 40 Ar/ 39 Ar and U-Pb
           Dating Techniques for the Xitian W-Sn Polymetallic Deposit, South China

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      Authors: Bai X; Liu M, Hu R, et al.
      Abstract: AbstractMineralization ages of many mineral deposit types (such as orogenic Au, stratabound Cu, and Mississippi Valley-type Pb-Zn deposits) are still difficult to date by the traditional isotopic chronometry because of the lack of suitable minerals. We have made efforts to establish a widely suitable dating technique to determine ore formation ages using a high-precision 40Ar/39Ar method on ubiquitously present fluid inclusions in quartz, sphalerite, and other nonpotassium minerals from hydrothermal deposits. The Xitian W-Sn polymetallic deposit in central South China contains several minerals suitable for isotopic dating for interchronometer comparison. 40Ar/39Ar laser step heating of 16 micas from ore veins, greisen, and metallogenic granites yields flat age spectra and thus well-defined ore formation ages ranging from 152.4 ± 1.5 (2σ) to 148.1 ± 1.4 Ma with an average of 150.2 ± 0.6 Ma. 40Ar/39Ar progressive crushing of nine quartz samples produces well-defined isochron lines for their primary fluid inclusions corresponding to isochron ages of 153.7–149.9 Ma with an average of 151.6 ± 0.6 Ma. Cassiterites from three hand specimens have weighted mean 206Pb/238U ages of 151.5 ± 1.7 (2σ), 149.7 ± 2.1, and 151.7 ± 2.1 Ma. All these new geochronological dates and previous molybdenite Re-Os ages yield well-constrained mineralization ages of 153–148 Ma for the Xitian W-Sn polymetallic deposit, which also confirms conclusively that the quartz 40Ar/39Ar progressive crushing technique is a feasible, valid dating technique. Furthermore, significant age information on the secondary fluid inclusions is potentially obtained simultaneously by this technique. We expect that this novel dating technique will be widely applied to determine the geologic fluids trapped in minerals during hydrothermal mineralization, hydrocarbon accumulation, metamorphism, tectonic activities, and other geologic processes.
      PubDate: Wed, 01 Jun 2022 00:00:00 GMT
       
  • INFLUENCE OF ORGANIC MATTER ON Re-Os DATING OF SULFIDES: INSIGHTS FROM THE
           GIANT JINDING SEDIMENT-HOSTED Zn-Pb DEPOSIT, CHINA

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      Authors: Huang S; Song Y, Zhou L, et al.
      Abstract: AbstractThis study evaluates the effect of organic matter impurities on pyrite Re-Os dating, using the giant Jinding sediment-hosted Zn-Pb deposit in China as an example. The Jinding deposit is hosted in a Paleocene evaporite dome that was a hydrocarbon reservoir before mineralization. Pyrite in Jinding formed in two stages: pre-ore (py1) and syn-ore (py2). Two types of py1 are recognized, organic matter-free and organic matter-bearing. The organic matter-free py1 contains homogeneously distributed low concentrations of Re (<2.5 ppb) that yields an isochron age of 51 ± 1 Ma (mean square of weighted deviates [MSWD] = 3.2). This date is interpreted to be the age of py1 formation. The organic matter-bearing py1 contains organic matter inclusions trapped during py1 growth and synchronous with bacterial reduction of sulfate. Elemental mapping with laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) shows that the organic matter inclusions have Re signals 1 to 4 orders of magnitude higher than those of pyrite, revealing that organic matter is the major host for Re. Such pyrite separates contain 37 to 1,145 ppb Re. The Re-Os data of organic matter-bearing py1 yield an isochron age of 72.9 ± 0.5 Ma (MSWD = 0.2). This age is older than the actual py1 formation age of 51 ± 1 Ma but overlaps with previously dated bitumen Re-Os isochron age of 68 ± 5 Ma at Jinding, indicating that organic matter inclusions can significantly influence the Re-Os dates of pyrite and likely other sulfides. This study demonstrates that in order to date sulfides formed in organic-rich environments using the Re-Os method, it is necessary to determine the distribution of Re in samples using detailed petrography and LA-ICP-MS trace element mapping plus spot analysis.
      PubDate: Wed, 01 Jun 2022 00:00:00 GMT
       
 
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