Articles | Volume 32, issue 1
https://doi.org/10.5194/ejm-32-171-2020
© Author(s) 2020. 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-32-171-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
11 Feb 2020
Research article |
| 11 Feb 2020
| 11 Feb 2020
Breyite inclusions in diamond: experimental evidence for possible dual origin
Alan B. Woodland
CORRESPONDING AUTHOR
Institut für Geowissenschaften, Goethe-Universität Frankfurt am Main,
Altenhöferallee 1, Frankfurt am Main, 60438, Germany
Andrei V. Girnis
Institut für Geowissenschaften, Goethe-Universität Frankfurt am Main,
Altenhöferallee 1, Frankfurt am Main, 60438, Germany
Institute of Geology of Ore Deposits, Petrography, Mineralogy and
Geochemistry, Russian Academy of Sciences, Staromonetny 35, Moscow, 119017,
Russia
Vadim K. Bulatov
Institut für Geowissenschaften, Goethe-Universität Frankfurt am Main,
Altenhöferallee 1, Frankfurt am Main, 60438, Germany
Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian
Academy of Sciences, ul. Kosygina 19, Moscow, 119991, Russia
Gerhard P. Brey
Institut für Geowissenschaften, Goethe-Universität Frankfurt am Main,
Altenhöferallee 1, Frankfurt am Main, 60438, Germany
Heidi E. Höfer
Institut für Geowissenschaften, Goethe-Universität Frankfurt am Main,
Altenhöferallee 1, Frankfurt am Main, 60438, Germany
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Melanie J. Sieber, Max Wilke, Oona Appelt, Marcus Oelze, and Monika Koch-Müller
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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.
Michael C. Jollands, Hugh St.C. O'Neill, Andrew J. Berry, Charles Le Losq, Camille Rivard, and Jörg Hermann
Eur. J. Mineral., 33, 113–138, https://doi.org/10.5194/ejm-33-113-2021, https://doi.org/10.5194/ejm-33-113-2021, 2021
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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.
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
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Short summary
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.
We experimentally explored direct entrapment of breyite (CaSiO3) by diamond at upper-mantle...
