Articles | Volume 33, issue 1
https://doi.org/10.5194/ejm-33-113-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-33-113-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
09 Feb 2021
Research article |
| 09 Feb 2021
| 09 Feb 2021
A combined Fourier transform infrared and Cr K-edge X-ray absorption near-edge structure spectroscopy study of the substitution and diffusion of H in Cr-doped forsterite
Michael C. Jollands
CORRESPONDING AUTHOR
Research School of Earth Sciences, Australian National University,
Canberra, ACT 2601, Australia
current address: Lamont-Doherty Earth Observatory, Columbia University, 61 Rt 9W,
Palisades, New York 10964, USA
Hugh St.C. O'Neill
Research School of Earth Sciences, Australian National University,
Canberra, ACT 2601, Australia
Andrew J. Berry
Research School of Earth Sciences, Australian National University,
Canberra, ACT 2601, Australia
Charles Le Losq
Université de Paris, Institut de Physique du Globe de Paris, UMR
7154 CNRS, 75005, Paris, France
Camille Rivard
European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000
Grenoble, France
current address: SOLEIL Synchrotron, L'Orme des Merisiers, Gif-sur-Yvette, 91192
Saint-Aubin, France
current address: INRAE, TRANSFORM, 44316 Nantes, France
Jörg Hermann
Research School of Earth Sciences, Australian National University,
Canberra, ACT 2601, Australia
current address: Institute of Geology, University of Bern, Baltzerstrasse 1+3, 3012
Bern, Switzerland
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Michael C. Jollands, Shiyun Jin, Martial Curti, Maxime Guillaumet, Keevin Béneut, Paola Giura, and Etienne Balan
Eur. J. Mineral., 35, 873–890, https://doi.org/10.5194/ejm-35-873-2023, https://doi.org/10.5194/ejm-35-873-2023, 2023
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The infrared spectrum of hydrous defects in corundum is routinely used in gemology, but the assignment of absorption bands to specific defects remains elusive. Here, we theoretically study selected defects and compare the results with available experimental data. The main results are the assignment of the
3161 cm−1 seriesto OH groups associated with Fe2+ ions and the interpretation of bands below 2700 cm−1 in corundum containing divalent cations in terms of overtones of OH bending modes.
Michael C. Jollands, Marc Blanchard, and Etienne Balan
Eur. J. Mineral., 32, 311–323, https://doi.org/10.5194/ejm-32-311-2020, https://doi.org/10.5194/ejm-32-311-2020, 2020
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Quartz is a very common form of almost pure silica. It can contain a small concentration of hydrogen-bearing defects whose nature is still debated. Here, we use a theoretical approach to unravel the atomic-scale geometry of these defects. Our findings help explain some important quartz properties.
Michael C. Jollands, Shiyun Jin, Martial Curti, Maxime Guillaumet, Keevin Béneut, Paola Giura, and Etienne Balan
Eur. J. Mineral., 35, 873–890, https://doi.org/10.5194/ejm-35-873-2023, https://doi.org/10.5194/ejm-35-873-2023, 2023
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The infrared spectrum of hydrous defects in corundum is routinely used in gemology, but the assignment of absorption bands to specific defects remains elusive. Here, we theoretically study selected defects and compare the results with available experimental data. The main results are the assignment of the
3161 cm−1 seriesto OH groups associated with Fe2+ ions and the interpretation of bands below 2700 cm−1 in corundum containing divalent cations in terms of overtones of OH bending modes.
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Eur. J. Mineral., 35, 679–701, https://doi.org/10.5194/ejm-35-679-2023, https://doi.org/10.5194/ejm-35-679-2023, 2023
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Mona Lueder, Renée Tamblyn, and Jörg Hermann
Eur. J. Mineral., 35, 243–265, https://doi.org/10.5194/ejm-35-243-2023, https://doi.org/10.5194/ejm-35-243-2023, 2023
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Although rutile does not have water in its chemical formula, it can contain trace amounts. We applied a new measurement protocol to study water incorporation into rutile from eight geological environments. H2O in natural rutile can be linked to six crystal defects, most importantly to Ti3+ and Fe3+. Quantifying the H2O in the individual defects can help us understand relationships of trace elements in rutile and might give us valuable information on the conditions under which the rock formed.
Michael C. Jollands, Marc Blanchard, and Etienne Balan
Eur. J. Mineral., 32, 311–323, https://doi.org/10.5194/ejm-32-311-2020, https://doi.org/10.5194/ejm-32-311-2020, 2020
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Quartz is a very common form of almost pure silica. It can contain a small concentration of hydrogen-bearing defects whose nature is still debated. Here, we use a theoretical approach to unravel the atomic-scale geometry of these defects. Our findings help explain some important quartz properties.
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This study presents an approach that combines equilibrium thermodynamic modelling with oxygen isotope fractionation modelling for investigating fluid–rock interaction in metamorphic systems. An application to subduction zones shows that chemical and isotopic zoning in minerals can be used to determine feasible fluid sources and the conditions of interaction. Slab-derived fluids can cause oxygen isotope variations in the mantle wedge that may result in anomalous isotopic signatures of arc lavas.
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In situ single-crystal X-ray diffraction of olivine inclusion in diamond from Shandong, China: implications for the depth of diamond formation
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Melting relations of Ca–Mg carbonates and trace element signature of carbonate melts up to 9 GPa – a proxy for melting of carbonated mantle lithologies
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Christian R. Singer, Harald Behrens, Ingo Horn, Martin Oeser, Ralf Dohmen, and Stefan Weyer
Eur. J. Mineral., 35, 1009–1026, https://doi.org/10.5194/ejm-35-1009-2023, https://doi.org/10.5194/ejm-35-1009-2023, 2023
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Li is a critical element that is often enriched in pegmatites. To better understand the enrichment of Li in such systems, it is necessary to understand the underlying transport mechanisms. We performed experiments to investigate diffusion rates and exchange mechanisms of Li between a Li-rich and a Li-poor melt at high temperature and pressure. Our results indicate that fluxing elements do not increase the diffusivity of Li compared to a flux-free melt.
Martin Oeser, Ingo Horn, Ralf Dohmen, and Stefan Weyer
Eur. J. Mineral., 35, 813–830, https://doi.org/10.5194/ejm-35-813-2023, https://doi.org/10.5194/ejm-35-813-2023, 2023
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Marc M. Hirschmann and Hongluo L. Zhang
Eur. J. Mineral., 35, 789–803, https://doi.org/10.5194/ejm-35-789-2023, https://doi.org/10.5194/ejm-35-789-2023, 2023
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We calibrate new models for the properties of solid and liquid FePt alloy. FePt alloy is used in experiments investigating the origin, differentiation, and evolution of planets to characterize oxygen fugacity. The new models facilitate use of FePt for more extreme conditions than has been possible previously. We also describe shortcomings in the present knowledge of FePt alloy properties and highlight strategies that could improve such knowledge.
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Eur. J. Mineral., 35, 321–331, https://doi.org/10.5194/ejm-35-321-2023, https://doi.org/10.5194/ejm-35-321-2023, 2023
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This work presents an in-depth description of a new design for a high-temperature gas-mixing furnace using a mixture of CO–CO2–SO2. It has been designed and built with user safety in mind. The furnace can sustain temperatures of up to 1650 °C. This furnace sets itself apart with its size and unique quench mechanism. Crucially, the apparatus has the ability to change the gas mixture during an experiment. This feature allows the user to simulate natural environments, such as volcanoes.
Lennart Koch and Burkhard C. Schmidt
Eur. J. Mineral., 35, 117–132, https://doi.org/10.5194/ejm-35-117-2023, https://doi.org/10.5194/ejm-35-117-2023, 2023
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Volatile diffusivities in silicate melts control the nucleation and growth of bubbles in ascending magma. We investigated the diffusion of CO2 in an anhydrous and hydrous leucititic melt at high temperatures and high pressure. CO2 diffusion profiles were measured via attenuated total reflection Fourier transform infrared spectroscopy. CO2 diffusion increases with increasing temperature and water content. The data can be used to understand the CO2 degassing behaviour of leucititic melts.
Melanie J. Sieber, Max Wilke, Oona Appelt, Marcus Oelze, and Monika Koch-Müller
Eur. J. Mineral., 34, 411–424, https://doi.org/10.5194/ejm-34-411-2022, https://doi.org/10.5194/ejm-34-411-2022, 2022
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Carbonates reduce the melting point of the mantle, and carbonate melts produced in low-degree melting of a carbonated mantle are considered the precursor of CO2-rich magmas. We established experimentally the melting relations of carbonates up to 9 GPa, showing that Mg-carbonates melt incongruently to periclase and carbonate melt. The trace element signature of carbonate melts parental to kimberlites is approached by melting of Mg-rich carbonates.
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, https://doi.org/10.5194/ejm-34-325-2022, 2022
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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.
Carla Tiraboschi, Francesca Miozzi, and Simone Tumiati
Eur. J. Mineral., 34, 59–75, https://doi.org/10.5194/ejm-34-59-2022, https://doi.org/10.5194/ejm-34-59-2022, 2022
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This review provides an overview of ex situ carbon-saturated COH fluid experiments at upper-mantle conditions. Several authors experimentally investigated the effect of COH fluids. However, fluid composition is rarely tackled as a quantitative issue, and rather infrequently fluids are analyzed as the associated solid phases in the experimental assemblage. Recently, improved techniques have been proposed for analyses of COH fluids, leading to significant advancement in fluid characterization.
Enrico Cannaò, Massimo Tiepolo, Giulio Borghini, Antonio Langone, and Patrizia Fumagalli
Eur. J. Mineral., 34, 35–57, https://doi.org/10.5194/ejm-34-35-2022, https://doi.org/10.5194/ejm-34-35-2022, 2022
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Amphibole–liquid partitioning of elements of geological relevance is experimentally derived at conditions compatible with those of the Earth's upper mantle. Experiments are carried out at different oxygen fugacity conditions and variable Cl content in order to investigate their influence on the amphibole–liquid partition coefficients. Our results point to the capability of amphibole to act as filter for trace elements at upper-mantle conditions, oxidized conditions, and Cl-rich environments.
Enrico Cannaò, Federica Schiavi, Giulia Casiraghi, Massimo Tiepolo, and Patrizia Fumagalli
Eur. J. Mineral., 34, 19–34, https://doi.org/10.5194/ejm-34-19-2022, https://doi.org/10.5194/ejm-34-19-2022, 2022
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Detailed knowledge of the mechanisms ruling water incorporation in amphibole is essential to understand how much water can be fixed at upper-mantle conditions by this mineral. We provide the experimental evidence of the Cl effect on the oxo-substitution and the incorporation of water in amphibole. Finally, we highlight the versatility of confocal micro-Raman spectroscopy as an analytical tool to quantify water in amphibole.
Joana Polednia, Ralf Dohmen, and Katharina Marquardt
Eur. J. Mineral., 32, 675–696, https://doi.org/10.5194/ejm-32-675-2020, https://doi.org/10.5194/ejm-32-675-2020, 2020
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Grain boundary diffusion is orders of magnitude faster compared to volume diffusion. We studied this fast transport process in a well-defined garnet grain boundary. State-of-the-art microscopy was used for quantification. A dedicated numerical diffusion model shows that iron diffusion requires the operation of two diffusion modes, one fast, one slow. We conclude that impurity bulk diffusion in garnet aggregates is always dominated by grain boundary diffusion.
Giulio Borghini and Patrizia Fumagalli
Eur. J. Mineral., 32, 251–264, https://doi.org/10.5194/ejm-32-251-2020, https://doi.org/10.5194/ejm-32-251-2020, 2020
Alan B. Woodland, Andrei V. Girnis, Vadim K. Bulatov, Gerhard P. Brey, and Heidi E. Höfer
Eur. J. Mineral., 32, 171–185, https://doi.org/10.5194/ejm-32-171-2020, https://doi.org/10.5194/ejm-32-171-2020, 2020
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We experimentally explored direct entrapment of breyite (CaSiO3) by diamond at upper-mantle conditions in a model subducted sediment rather than formation by retrogression of CaSiO3 perovskite, implying a deeper origin. Anhydrous low-T melting of CaCO3+SiO2 precludes breyite formation. Under hydrous conditions, reduction of melt results in graphite with breyite. Thus, breyite inclusions in natural diamond may form from aragonite + coesite or carbonate melt at 6–8 GPa via reduction with water.
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Short summary
How, and how fast, does hydrogen move through crystals? We consider this question by adding hydrogen, by diffusion, to synthetic crystals of olivine doped with trace amounts of chromium. Even in a highly simplified system, the behaviour of hydrogen is complex. Hydrogen can move into and through the crystal using various pathways (different defects within the crystal) and hop between these pathways too.
How, and how fast, does hydrogen move through crystals? We consider this question by adding...
