 Subjects -> MINES AND MINING INDUSTRY (Total: 82 journals)
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- High-pressure homogenization of olivine-hosted CO2-rich melt inclusions in
a piston cylinder: insight into the volatile content of primary mantle
melts-
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Abstract: High-pressure homogenization of olivine-hosted CO2-rich melt inclusions in a piston cylinder: insight into the volatile content of primary mantle melts
Roxane Buso, Didier Laporte, Federica Schiavi, Nicolas Cluzel, and Claire Fonquernie
Eur. J. Mineral., 34, 325–349, https://doi.org/10.5194/ejm-34-325-2022, 2022
Magmas transport large amounts of CO2 from Earth's mantle into the atmosphere and thus contribute significantly to the global carbon cycle. We have developed an experimental method to homogenize at high pressure small liquid droplets trapped in magmatic crystals to gain access to the initial composition of the parental magma (major and volatile elements). With this technique, we show that magmas produced by melting of the subcontinental mantle contain several weight percent of CO2.
PubDate: Tue, 24 May 2022 19:25:50 +020
DOI: 10.5194/ejm-34-325-2022 2022
- Arrojadite-group nomenclature: sigismundite reinstated
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Abstract: Arrojadite-group nomenclature: sigismundite reinstated
Frank de Wit and Stuart J. Mills
Eur. J. Mineral., 34, 321–324, https://doi.org/10.5194/ejm-34-321-2022, 2022
The name sigismundite has been reinstated for what was previously arrojadite-(BaFe). Sigismundite honours Pietro Sigismund (1874–1962), and this paper outlines his significant contributions to Italian mineralogy.
PubDate: Tue, 24 May 2022 19:25:50 +020
DOI: 10.5194/ejm-34-321-2022 2022
- Firing and post-firing dynamics of Mg- and Ca-rich bricks used in the
built heritage of the city of Padua (northeastern Italy)-
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Abstract: Firing and post-firing dynamics of Mg- and Ca-rich bricks used in the built heritage of the city of Padua (northeastern Italy)
Elena Mercedes Pérez-Monserrat, Lara Maritan, and Giuseppe Cultrone
Eur. J. Mineral., 34, 301–319, https://doi.org/10.5194/ejm-34-301-2022, 2022
A very representative type of historic brick, made of Mg- and Ca-rich illitic clays fired at high temperatures and used in the city of Padua, was studied. The mineral phases formed during the firing and the processes that took place after firing have enhanced the durability of the bricks, so the data obtained may be significant to the current ceramic industry. This study was framed within the CLAYONRISK project (MSCA-IF-2018) and was performed based on archeometric methodologies.
PubDate: Thu, 19 May 2022 10:53:05 +020
DOI: 10.5194/ejm-34-301-2022 2022
- Crystallographic orientation mapping of lizardite serpentinite by Raman
spectroscopy-
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Abstract: Crystallographic orientation mapping of lizardite serpentinite by Raman spectroscopy
Matthew S. Tarling, Matteo Demurtas, Steven A. F. Smith, Jeremy S. Rooney, Marianne Negrini, Cecilia Viti, Jasmine R. Petriglieri, and Keith C. Gordon
Eur. J. Mineral., 34, 285–300, https://doi.org/10.5194/ejm-34-285-2022, 2022
Rocks containing the serpentine mineral lizardite occur in many tectonic settings. Knowing the crystal orientation of lizardite in these rocks tells us how they deform and gives insights into their physical properties. The crystal orientation of lizardite is challenging to obtain using standard techniques. To overcome this challenge, we developed a method using Raman spectroscopy to map the crystal orientation of lizardite with minimal preparation on standard thin sections.
PubDate: Wed, 11 May 2022 12:10:49 +020
DOI: 10.5194/ejm-34-285-2022 2022
- Automatic element and mineral detection in thin sections using
hyperspectral transmittance imaging microscopy (HyperTIM)-
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Abstract: Automatic element and mineral detection in thin sections using hyperspectral transmittance imaging microscopy (HyperTIM)
Helge L. C. Daempfling, Christian Mielke, Nicole Koellner, Melanie Lorenz, Christian Rogass, Uwe Altenberger, Daniel E. Harlov, and Michael Knoper
Eur. J. Mineral., 34, 275–284, https://doi.org/10.5194/ejm-34-275-2022, 2022
In this study we present a novel method for the automatic detection of minerals and elements using hyperspectral transmittance imaging microscopy measurements of complete thin sections (HyperTIM).
PubDate: Tue, 10 May 2022 08:13:54 +020
DOI: 10.5194/ejm-34-275-2022 2022
- The effect of Co substitution on the Raman spectra of pyrite: potential as
an assaying tool-
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Abstract: The effect of Co substitution on the Raman spectra of pyrite: potential as an assaying tool
Khulan Berkh and Dieter Rammlmair
Eur. J. Mineral., 34, 259–274, https://doi.org/10.5194/ejm-34-259-2022, 2022
Common energy dispersive methods cannot accurately analyze low concentrations of cobalt in pyrite due to the overlapping of cobalt and iron peaks. The Raman method, on the other hand, has been shown to be very sensitive to a trace amount of cobalt. In addition, it can be applied on a rough surface, does not require a vacuum chamber, and operates with a laser instead of X-rays. Thus, Raman has the potential to be used as an assaying tool for Co-bearing pyrite.
PubDate: Thu, 14 Apr 2022 09:39:47 +020
DOI: 10.5194/ejm-34-259-2022 2022
- IMA Commission on New Minerals, Nomenclature and Classification (CNMNC)
– Newsletter 66-
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Abstract: IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 66
Ritsuro Miyawaki, Frédéric Hatert, Marco Pasero, and Stuart J. Mills
Eur. J. Mineral., 34, 253–257, https://doi.org/10.5194/ejm-34-253-2022, 2022
PubDate: Wed, 13 Apr 2022 11:55:48 +020
DOI: 10.5194/ejm-34-253-2022 2022
- Theoretical OH stretching vibrations in dravite
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Abstract: Theoretical OH stretching vibrations in dravite
Yves Fuchs, Chloé Fourdrin, and Etienne Balan
Eur. J. Mineral., 34, 239–251, https://doi.org/10.5194/ejm-34-239-2022, 2022
Information about the local structure of tourmaline-group minerals can be obtained from the characteristic OH stretching bands in their vibrational spectra. However, their assignment to specific atomic-scale environments is debated. We address this question theoretically by investigating a series of dravite models. Our results support a local role of cationic occupancies in determining the OH stretching frequencies and bring constraints for the interpretation of the vibrational spectra.
PubDate: Wed, 13 Apr 2022 11:55:48 +020
DOI: 10.5194/ejm-34-239-2022 2022
- Redefinition of beraunite, Fe3+6(PO4)4O(OH)4 ⋅ 6H2O, and
discreditation of the name eleonorite: a re-investigation of type material
from the Hrbek Mine (Czech Republic)-
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Abstract: Redefinition of beraunite, Fe3+6(PO4)4O(OH)4 ⋅ 6H2O, and discreditation of the name eleonorite: a re-investigation of type material from the Hrbek Mine (Czech Republic)
Luboš Vrtiška, Jaromír Tvrdý, Jakub Plášil, Jiří Sejkora, Radek Škoda, Nikita V. Chukanov, Andreas Massanek, Jan Filip, Zdeněk Dolníček, and František Veselovský
Eur. J. Mineral., 34, 223–238, https://doi.org/10.5194/ejm-34-223-2022, 2022
The study of the original material of beraunite from the type locality Hrbek, Czech Rep., from collections of the TU Bergakademie Freiberg (Germany) and National Museum Prague (Czech Republic) proved the identity of the minerals beraunite and eleonorite. Because the name beraunite has priority, we consider the name eleonorite to be redundant and proposed to abolish it. The proposal 21-D approved by the IMA discredited eleonorite and accepted the formula of beraunite Fe3+6(PO4)4O(OH)4·6H2O.
PubDate: Tue, 12 Apr 2022 11:55:48 +020
DOI: 10.5194/ejm-34-223-2022 2022
- Redefinition of angastonite, CaMgAl2(PO4)2(OH)4 ⋅ 7H2O,
as an amorphous mineral-
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Abstract: Redefinition of angastonite, CaMgAl2(PO4)2(OH)4 ⋅ 7H2O, as an amorphous mineral
Ian Edward Grey, Peter Elliott, William Gus Mumme, Colin M. MacRae, Anthony R. Kampf, and Stuart J. Mills
Eur. J. Mineral., 34, 215–221, https://doi.org/10.5194/ejm-34-215-2022, 2022
A reinvestigation of angastonite from the type locality has shown that it is a mixture of crystalline phases and an amorphous phase, with the published formula corresponding to the amorphous phase. A redefinition proposal for angastonite as an amorphous mineral was approved by the IMA CNMNC. Our study showed how the amorphous phase formed and how it progressively recrystallises as new crandallite-related minerals.
PubDate: Thu, 07 Apr 2022 14:01:00 +020
DOI: 10.5194/ejm-34-215-2022 2022
- In situ reinvestigation of reaction phase A plus high-pressure
clinoenstatite to forsterite plus water in the system MgO-SiO2-H2O (MSH)-
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Abstract: In situ reinvestigation of reaction phase A plus high-pressure clinoenstatite to forsterite plus water in the system MgO-SiO2-H2O (MSH)
Christian Lathe, Monika Koch-Müller, Bernd Wunder, Oona Appelt, Shrikant Bhat, and Robert Farla
Eur. J. Mineral., 34, 201–213, https://doi.org/10.5194/ejm-34-201-2022, 2022
The equilibrium phase of A + HP clinoenstatite = forsterite + water was experimentally investigated at aH2O = 1 in situ. In cold subducting slabs, it is of relevance to transport water to large depths, initiating the formation of dense hydrous magnesium silicate (DHMS). At normal gradients, the huge water amount from this reaction induces important processes within the overlying mantle wedge. We additionally discuss the relevance of this reaction for intermediate-depth earthquake formation.
PubDate: Thu, 31 Mar 2022 08:56:44 +020
DOI: 10.5194/ejm-34-201-2022 2022
- Iron oxide inclusions and exsolution textures of rainbow lattice sunstone
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Abstract: Iron oxide inclusions and exsolution textures of rainbow lattice sunstone
Shiyun Jin, Ziyin Sun, and Aaron C. Palke
Eur. J. Mineral., 34, 183–200, https://doi.org/10.5194/ejm-34-183-2022, 2022
The inclusions and exsolution lamellae in rainbow lattice sunstone (RLS) are studied using microscopic observations, chemical analyses and single-crystal X-ray diffraction. Complicated processes producing the aventurescence and adularescence effect in RLS are revealed through the spatial relationship among the inclusions and exsolution lamellae, as well as the unique ordering pattern in the feldspar structures.
PubDate: Mon, 28 Mar 2022 11:55:52 +020
DOI: 10.5194/ejm-34-183-2022 2022
- Ab initio thermal expansion and thermoelastic properties of ringwoodite
(γ-Mg2SiO4) at mantle transition zone conditions-
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Abstract: Ab initio thermal expansion and thermoelastic properties of ringwoodite (γ-Mg2SiO4) at mantle transition zone conditions
Donato Belmonte, Mattia La Fortezza, and Francesca Menescardi
Eur. J. Mineral., 34, 167–182, https://doi.org/10.5194/ejm-34-167-2022, 2022
We carried out theoretical calculations of the vibrational and thermophysical properties of Mg2SiO4 ringwoodite, a major mineral phase of the Earth's mantle transition zone. We tried to understand why current data on volume thermal expansion are still controversial by performing a detailed analysis of vibrational spectra. We proposed a reliable parametrization for thermal expansivity of ringwoodite in the transition zone which could be useful for numerical simulations of mantle convection.
PubDate: Thu, 24 Mar 2022 14:12:53 +010
DOI: 10.5194/ejm-34-167-2022 2022
- Lower mantle geotherms, flux, and power from incorporating new
experimental and theoretical constraints on heat transport properties in
an inverse model-
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Abstract: Lower mantle geotherms, flux, and power from incorporating new experimental and theoretical constraints on heat transport properties in an inverse model
Anne M. Hofmeister
Eur. J. Mineral., 34, 149–165, https://doi.org/10.5194/ejm-34-149-2022, 2022
The previously unknown temperature gradient in Earth's largest layer is uniquely extracted from a seismology average, the only information available. Data used from laboratory studies are minimal and describe general behavior. Adding a new theory and data on heat transport properties provides flux (heat per area per time) and power (total wattage) vs. depth. Temperature vs. depth instead uses an additive constant, which is constrained by data on melting. I show the lower mantle is heating up.
PubDate: Mon, 28 Feb 2022 08:55:36 +010
DOI: 10.5194/ejm-34-149-2022 2022
- IMA Commission on New Minerals, Nomenclature and Classification (CNMNC)
– Newsletter 65-
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Abstract: IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 65
Ritsuro Miyawaki, Frédéric Hatert, Marco Pasero, and Stuart J. Mills
Eur. J. Mineral., 34, 143–148, https://doi.org/10.5194/ejm-34-143-2022, 2022
PubDate: Thu, 24 Feb 2022 14:51:43 +010
DOI: 10.5194/ejm-34-143-2022 2022
- Vanadium carbides in shungite
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Abstract: Vanadium carbides in shungite
Vladimir V. Kovalevski and Igor A. Moshnikov
Eur. J. Mineral., 34, 131–141, https://doi.org/10.5194/ejm-34-131-2022, 2022
Vanadium carbides in shungite are shown to be present in several forms, which reflects the distinctive conditions of their formation. An ordered carbon film revealed on the vanadium carbide particles could protect the particles from transformations for a long time. The parageneses of vanadium carbide and roscoelite occur, indicating that roscoelite in shungite rocks may be a secondary mineral formed upon vanadium carbide decomposition.
PubDate: Wed, 16 Feb 2022 09:46:42 +010
DOI: 10.5194/ejm-34-131-2022 2022
- Melt–rock interactions in a veined mantle: pyroxenite–peridotite
reaction experiments at 2 GPa-
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Abstract: Melt–rock interactions in a veined mantle: pyroxenite–peridotite reaction experiments at 2 GPa
Giulio Borghini, Patrizia Fumagalli, and Elisabetta Rampone
Eur. J. Mineral., 34, 109–129, https://doi.org/10.5194/ejm-34-109-2022, 2022
The mineralogical and chemical heterogeneity of the mantle is poorly known because it is not able to be directly investigated. Melt–peridotite interaction processes play a fundamental role in controlling the mantle composition. The results of our reaction experiments help us to evaluate the role of temperature and melt composition in the modification of the mantle through the interaction with pyroxenite-derived melts with implications for the evolution of a veined mantle.
PubDate: Wed, 16 Feb 2022 09:46:42 +010
DOI: 10.5194/ejm-34-109-2022 2022
- Liguowuite, WO3, a new member of the A-site vacant perovskite type
minerals from the Panzhihua–Xichang region, China-
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Abstract: Liguowuite, WO3, a new member of the A-site vacant perovskite type minerals from the Panzhihua–Xichang region, China
Yuan Xue, Ningyue Sun, Hongping He, Aiqing Chen, and Yiping Yang
Eur. J. Mineral., 34, 95–108, https://doi.org/10.5194/ejm-34-95-2022, 2022
Liguowuite, a new member of the non-stoichiometric perovskite group minerals, ideally WO3, has been found in the Panzhihua–Xichang region, China. Liguowuite is monoclinic and is in space group P21 / n, with a = 7.32582(18) Å, b = 7.54767(18) Å, c = 7.71128(18) Å, β = 90.678(3)°, V = 426.348(19) Å3, and Z = 8. According to the hierarchical scheme for perovskite supergroup minerals, liguowuite is the first reported example of A-site vacant single oxide, i.e., a new perovskite subgroup.
PubDate: Tue, 08 Feb 2022 09:46:42 +010
DOI: 10.5194/ejm-34-95-2022 2022
- On an exceptional sample of wooden crystallographic models from the
collection of minerals at the École des Mines de Saint-Étienne (France):
description, history, digitalization, duplication-
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Abstract: On an exceptional sample of wooden crystallographic models from the collection of minerals at the École des Mines de Saint-Étienne (France): description, history, digitalization, duplication
Jean Rieu, Victor Beley, and Bernard Guy
Eur. J. Mineral., 34, 85–94, https://doi.org/10.5194/ejm-34-85-2022, 2022
The École des Mines de Saint-Étienne possesses an important collection of wooden crystallographic models. Rehabilitation action was undertaken. Several series of Krantz models were identified by the logos and linked to catalogs. An exceptional element was discovered: a polyhedron with 170 facets, from the cubic system. We report on the digitalization work, followed by a description of two duplication methods: 3D printing and precision lost-wax vacuum casting.
PubDate: Tue, 01 Feb 2022 09:46:42 +010
DOI: 10.5194/ejm-34-85-2022 2022
- Sedimentary pyrite as a trap of organic matter: preliminary results from
large-framboid observation-
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Abstract: Sedimentary pyrite as a trap of organic matter: preliminary results from large-framboid observation
Nicolas Tribovillard, Viviane Bout-Roumazeilles, Marion Delattre, Sandra Ventalon, and Abderrahmane Bensadok
Eur. J. Mineral., 34, 77–83, https://doi.org/10.5194/ejm-34-77-2022, 2022
The studied succession of limestone and marls is enriched in pyrite framboids. The question is, could sulfate-reducing bacteria have been trapped in pyrite sarcophagi induced by their own metabolism' Our analysis reveals the presence of abundant organic matter. The typical morphology of framboids suggests the early fossilization of bacterial colonies by pyrite. If pyrite is a trap for organic molecules, then pyrite could be an underevaluated component of the C cycle.
PubDate: Fri, 28 Jan 2022 09:46:42 +010
DOI: 10.5194/ejm-34-77-2022 2022
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