Articles | Volume 36, issue 1
https://doi.org/10.5194/ejm-36-195-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/ejm-36-195-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
12 Feb 2024
Research article |
| 12 Feb 2024
| 12 Feb 2024
Confocal μ-XANES as a tool to analyze Fe oxidation state in heterogeneous samples: the case of melt inclusions in olivine from the Hekla volcano
Roman Botcharnikov
CORRESPONDING AUTHOR
Institut für Geowissenschaften, Johannes Gutenberg Universität Mainz, Mainz, Germany
Max Wilke
Institut für Geowissenschaften, Universität Potsdam, Potsdam, Germany
Jan Garrevoet
Deutsches Elektronen-Synchrotron, DESY, Hamburg, Germany
Maxim Portnyagin
GEOMAR Helmholtz-Zentrum für Ozeanforschung, Kiel, Germany
Kevin Klimm
Institut für Geowissenschaften, Goethe Universität Frankfurt, Frankfurt, Germany
Stephan Buhre
Institut für Geowissenschaften, Johannes Gutenberg Universität Mainz, Mainz, Germany
Stepan Krasheninnikov
Institut für Geowissenschaften, Johannes Gutenberg Universität Mainz, Mainz, Germany
Renat Almeev
Institut für Mineralogie, Leibniz Universität Hannover, Hanover, Germany
Severine Moune
Observatoire de Physique du Globe de Clermont-Ferrand, Université Clermont Auvergne, Aubière CEDEX, France
Gerald Falkenberg
Deutsches Elektronen-Synchrotron, DESY, Hamburg, Germany
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Lascar volcano, located in northern Chile, is among the most active volcanoes of the Andes. Its activity culminated in the last major explosive eruption in April 1993. We carried out experiments at high temperatures (up to 1050 °C) and pressures (up to 5000 bar) in the lab, and we used a wide variety of geochemical methods to provide comprehensive constraints on the depth and temperature of the magma chamber beneath Lascar volcano.
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Lascar volcano, located in northern Chile, is among the most active volcanoes of the Andes. Its activity culminated in the last major explosive eruption in April 1993. We carried out experiments at high temperatures (up to 1050 °C) and pressures (up to 5000 bar) in the lab, and we used a wide variety of geochemical methods to provide comprehensive constraints on the depth and temperature of the magma chamber beneath Lascar volcano.
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We studied the exchange of chemical elements by diffusion between magmas of tephritic and phonolitic composition from the Canary Islands, performing experiments at high pressure and high temperature with different amounts of added water. Our results characterize the way water and temperature affect the diffusion process, and we also find unexpectedly high mobility of aluminium, which may be related to its variable chemical bonding in highly alkaline melts.
Carina Silke Hanser, Tobias Häger, and Roman Botcharnikov
Eur. J. Mineral., 36, 449–472, https://doi.org/10.5194/ejm-36-449-2024, https://doi.org/10.5194/ejm-36-449-2024, 2024
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The structure of beryl has been a topic of research for decades but is still not entirely understood. This especially applies to substitutions by Fe ions and the occupation of the channels of beryl by H2O and alkalis. The growing amount of studies makes it difficult to gain an overview on these topics. Therefore, this article reviews the current consensus and debates found in the literature.
Diao Luo, Marc K. Reichow, Tong Hou, M. Santosh, Zhaochong Zhang, Meng Wang, Jingyi Qin, Daoming Yang, Ronghao Pan, Xudong Wang, François Holtz, and Roman Botcharnikov
Eur. J. Mineral., 34, 469–491, https://doi.org/10.5194/ejm-34-469-2022, https://doi.org/10.5194/ejm-34-469-2022, 2022
Short summary
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Volcanoes on Earth are divided into monogenetic and composite volcanoes based on edifice shape. Currently the evolution from monogenetic to composite volcanoes is poorly understood. There are two distinct magma chambers, with a deeper region at the Moho and a shallow mid-crustal zone in the Wulanhada Volcanic Field. The crustal magma chamber represents a snapshot of transition from monogenetic to composite volcanoes, which experience more complex magma processes than magma stored in the Moho.
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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.
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Short summary
The new spectroscopic method, based on the syncrotron radiation, allows for determination of Fe oxidation state in tiny objects or in heterogeneous samples. This technique is expected to be an important tool in geosciences unraveling redox conditions in rocks and magmas as well as in material sciences providing constraints on material properties.
The new spectroscopic method, based on the syncrotron radiation, allows for determination of Fe...
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