Articles | Volume 35, issue 5
https://doi.org/10.5194/ejm-35-789-2023
© Author(s) 2023. 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-35-789-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
22 Sep 2023
Research article |
| 22 Sep 2023
| 22 Sep 2023
A revised model for activity–composition relations in solid and molten FePt alloys and a preliminary model for characterization of oxygen fugacity in high-pressure experiments
Dept of Earth & Environmental Sciences, University of Minnesota, Minneapolis, MN 55455, USA
Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth, Germany
Hongluo L. Zhang
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China
Related subject area
Experimental petrology
Elasticity of mixtures and implications for piezobarometry of mixed-phase inclusions
In situ single-crystal X-ray diffraction of olivine inclusion in diamond from Shandong, China: implications for the depth of diamond formation
One-atmosphere high-temperature CO–CO2–SO2 gas-mixing furnace: design, operation, and applications
CO2 diffusion in dry and hydrous leucititic melt
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
High-pressure homogenization of olivine-hosted CO2-rich melt inclusions in a piston cylinder: insight into the volatile content of primary mantle melts
Carbon-saturated COH fluids in the upper mantle: a review of high-pressure and high-temperature ex situ experiments
The influence of oxygen fugacity and chlorine on amphibole–liquid trace element partitioning at upper-mantle conditions
Effect of chlorine on water incorporation in magmatic amphibole: experimental constraints with a micro-Raman spectroscopy approach
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
Grain boundary diffusion and its relation to segregation of multiple elements in yttrium aluminum garnet
Melting relations of anhydrous olivine-free pyroxenite Px1 at 2 GPa
Breyite inclusions in diamond: experimental evidence for possible dual origin
Ross J. Angel, Mattia L. Mazzucchelli, Kira A. Musiyachenko, Fabrizio Nestola, and Matteo Alvaro
Eur. J. Mineral., 35, 461–478, https://doi.org/10.5194/ejm-35-461-2023, https://doi.org/10.5194/ejm-35-461-2023, 2023
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We have developed the thermodynamic theory of the properties of inclusions consisting of more than one phase, including inclusions containing solids plus a fluid. We present a software utility that enables for the first time the entrapment conditions of multiphase inclusions to be determined from the measurement of their internal pressure when that is measured in a laboratory.
Yanjuan Wang, Fabrizio Nestola, Huaikun Li, Zengqian Hou, Martha G. Pamato, Davide Novella, Alessandra Lorenzetti, Pia Antonietta Antignani, Paolo Cornale, Jacopo Nava, Guochen Dong, and Kai Qu
Eur. J. Mineral., 35, 361–372, https://doi.org/10.5194/ejm-35-361-2023, https://doi.org/10.5194/ejm-35-361-2023, 2023
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In this work we have applied the elastic geobarometry approach to a Chinese diamond in order to determine the depth of formation of an olivine-bearing diamond. Together with the temperature of residence at which the diamond resided in the mantle, we were able to discover that the diamond was formed at about 190 km depth. Beyond the geological meaning of our results, this work could be a reference paper for future works on Chinese diamonds using elastic geobarometry.
Shashank Prabha-Mohan, Kenneth T. Koga, Antoine Mathieu, Franck Pointud, and Diego F. Narvaez
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.
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
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
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.
We calibrate new models for the properties of solid and liquid FePt alloy. FePt alloy is used in...
