Articles | Volume 32, issue 2
https://doi.org/10.5194/ejm-32-251-2020
© 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-32-251-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
23 Mar 2020
Research article |
| 23 Mar 2020
| 23 Mar 2020
Melting relations of anhydrous olivine-free pyroxenite Px1 at 2 GPa
Giulio Borghini
Dipartimento di Scienze della Terra, via Botticelli 23, 20133 Milan, Italy
Patrizia Fumagalli
CORRESPONDING AUTHOR
Dipartimento di Scienze della Terra, via Botticelli 23, 20133 Milan, Italy
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Giulio Borghini, Patrizia Fumagalli, and Elisabetta Rampone
Eur. J. Mineral., 34, 109–129, https://doi.org/10.5194/ejm-34-109-2022, https://doi.org/10.5194/ejm-34-109-2022, 2022
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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.
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.
Benedetta Chrappan Soldavini, Marco Merlini, Mauro Gemmi, Paola Parlanti, Patrizia Fumagalli, Sula Milani, Boby Joseph, Giorgio Bais, Maurizio Polentarutti, Alexander Kurnosov, and Stefano Poli
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The CaSiO3 system exhibits structural complexity with various polymorphs under different pressure and temperature conditions. This study stabilizes a new high-pressure polymorph, parabreyite, via multianvil syntheses at 4–5 GPa and 600–800 °C. Parabreyite's triclinic structure, with distinct threefold tetrahedral rings, was solved using 3D electron diffraction and X-ray diffraction. Elastic properties, thermal expansion and Raman spectra differences with breyite were analyzed.
Sula Milani, Deborah Spartà, Patrizia Fumagalli, Boby Joseph, Roberto Borghes, Valentina Chenda, Juliette Maurice, Giorgio Bais, and Marco Merlini
Eur. J. Mineral., 34, 351–358, https://doi.org/10.5194/ejm-34-351-2022, https://doi.org/10.5194/ejm-34-351-2022, 2022
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This work presents new thermoelastic parameters and the structural evolution of burbankite at high pressure and high temperature, obtained by in situ synchrotron radiation single-crystal diffraction measurements. Burbankite is a carbonate that may potentially play a key role as an upper-mantle reservoir of light REE3+. We observed that the density of burbankite is greater with respect to carbonatitic magmas, indicating a possible fractionation of this phase in upper-mantle conditions.
Giulio Borghini, Patrizia Fumagalli, and Elisabetta Rampone
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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.
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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.
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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.
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Experimental petrology constraints on kamafugitic magmas
Chrome incorporation in high-pressure Fe–Mg oxides
Magma storage conditions of Lascar andesites, central volcanic zone, Chile
Chemical interdiffusion between Na-series tephritic and phonolitic melts with different H2O content, temperature, and oxygen fugacity values
Re-equilibration of quartz inclusions in garnet
H2 mobility and redox control in open vs. closed hydrothermal oceanic systems – evidence from serpentinization experiments
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Li–Na interdiffusion and diffusion-driven lithium isotope fractionation in pegmatitic melts
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The growing interest in lithium (Li) diffusion for the determination of timescales of magmatic events increases the necessity to better understand Li diffusion in common mineral phases. In this context we analyzed Li diffusion in plagioclase, one of the most common mineral phases. Our study is the first to confirm two diffusion mechanisms for Li in plagioclase, and our results indicate timescales derived from Li diffusion data in previous studies were underestimated by a factor of up to 100.
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Eur. J. Mineral., 36, 899–916, https://doi.org/10.5194/ejm-36-899-2024, https://doi.org/10.5194/ejm-36-899-2024, 2024
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Benjamin A. Pummell and Jay B. Thomas
Eur. J. Mineral., 36, 581–597, https://doi.org/10.5194/ejm-36-581-2024, https://doi.org/10.5194/ejm-36-581-2024, 2024
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Mechanical interaction between quartz inclusions in garnet creates residual pressure in the inclusion used to calculate the pressure and temperature where the two minerals formed. We crystallised quartz and garnet at high pressure and temperature and then adjusted the experimental pressure to observe the interaction between the quartz inclusions and garnet host. The quartz and garnet adjust to the new experimental pressures, reset inclusion pressures, and no longer match entrapment conditions.
Colin Fauguerolles, Teddy Castelain, Johan Villeneuve, and Michel Pichavant
Eur. J. Mineral., 36, 555–579, https://doi.org/10.5194/ejm-36-555-2024, https://doi.org/10.5194/ejm-36-555-2024, 2024
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Ross J. Angel, Matteo Alvaro, and Silvio Ferrero
Eur. J. Mineral., 36, 411–415, https://doi.org/10.5194/ejm-36-411-2024, https://doi.org/10.5194/ejm-36-411-2024, 2024
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Inclusions in natural rocks are an invaluable asset for geoscientists because they provide information about processes in the Earth's history that are otherwise hidden or subsequently overprinted. In this paper we review the development over the last 200 years of the concepts and methods to measure the remnant pressures in mineral inclusions and how they can be used to determine pressures and temperatures at which the inclusions were formed deep within the Earth.
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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This study presents a new method designed to analyze micrometer-scale chemical and isotopic profiles in minerals, glasses, and other solids. The employed technique combines plasma mass spectrometers and a state-of-the-art femtosecond laser equipped with open-source software (LinuxCNC) that controls the movement of the laser beam. It allows for equably drilling into the sample surface, e.g., in order to measure chemically or isotopically zoned or heterogeneous materials at micrometer scales.
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.
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
Short summary
Short summary
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
Short summary
Short summary
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.
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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