Confocal $\mu$-XANES as a tool to analyze Fe oxidation state in heterogeneous samples: the case of melt inclusions in olivine from the Hekla volcano
Here we present a confocal Fe K-edge $μ$-XANES method (where XANES stands for X-ray absorption near-edge spectroscopy) for the analysis of Fe oxidation state in heterogeneous and one-side-polished samples. The new technique allows for an analysis of small volumes with high spatial 3D resolution of &...
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2024
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ftdesyvdb:oai:bib-pubdb1.desy.de:605229 2024-05-19T07:41:40+00:00 Confocal $\mu$-XANES as a tool to analyze Fe oxidation state in heterogeneous samples: the case of melt inclusions in olivine from the Hekla volcano Botcharnikov, Roman Wilke, Max Garrevoet, Jan Portnyagin, Maxim Klimm, Kevin Buhre, Stephan Krasheninnikov, Stepan Almeev, Renat Moune, Severine Falkenberg, Gerald DE 2024 https://bib-pubdb1.desy.de/record/605229 https://bib-pubdb1.desy.de/search?p=id:%22PUBDB-2024-01366%22 eng eng Copernicus Publications info:eu-repo/semantics/altIdentifier/doi/10.5194/ejm-36-195-2024 info:eu-repo/semantics/altIdentifier/issn/0935-1221 info:eu-repo/semantics/altIdentifier/doi/10.3204/PUBDB-2024-01366 info:eu-repo/semantics/altIdentifier/issn/1617-4011 https://bib-pubdb1.desy.de/record/605229 https://bib-pubdb1.desy.de/search?p=id:%22PUBDB-2024-01366%22 info:eu-repo/semantics/openAccess European journal of mineralogy 36(1), 195 - 208 (2024). doi:10.5194/ejm-36-195-2024 info:eu-repo/classification/ddc/550 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2024 ftdesyvdb https://doi.org/10.5194/ejm-36-195-202410.3204/PUBDB-2024-01366 2024-04-22T23:37:16Z Here we present a confocal Fe K-edge $μ$-XANES method (where XANES stands for X-ray absorption near-edge spectroscopy) for the analysis of Fe oxidation state in heterogeneous and one-side-polished samples. The new technique allows for an analysis of small volumes with high spatial 3D resolution of <100 µm$^3$. The probed volume is restricted to that just beneath the surface of the exposed object. This protocol avoids contamination of the signal by the host material and minimizes self-absorption effects. This technique has been tested on a set of experimental glasses with a wide range of Fe$^{3+}$ $Σ$Fe ratios. The method was applied to the analysis of natural melt inclusions trapped in forsteritic to fayalitic olivine crystals of the Hekla volcano, Iceland. Our measurements reveal changes in Fe$^{3+}$ $Σ$Fe from 0.17 in basaltic up to 0.45 in dacitic melts, whereas the magnetite–ilmenite equilibrium shows redox conditions with Fe$^{3+}$ $Σ$Fe ≤0.20 (close to FMQ, fayalite–magnetite–quartz redox equilibrium) along the entire range of Hekla melt compositions. This discrepancy indicates that the oxidized nature of glasses in the melt inclusions could be related to the post-entrapment process of diffusive hydrogen loss from inclusions and associated oxidation of Fe in the melt. The Fe$^{3+}$ $Σ$Fe ratio in silicic melts is particularly susceptible to this process due to their low FeO content, and it should be critically evaluated before petrological interpretation. Article in Journal/Newspaper Hekla Iceland DESY Publication Database (PUBDB) |
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DESY Publication Database (PUBDB) |
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English |
topic |
info:eu-repo/classification/ddc/550 |
spellingShingle |
info:eu-repo/classification/ddc/550 Botcharnikov, Roman Wilke, Max Garrevoet, Jan Portnyagin, Maxim Klimm, Kevin Buhre, Stephan Krasheninnikov, Stepan Almeev, Renat Moune, Severine Falkenberg, Gerald Confocal $\mu$-XANES as a tool to analyze Fe oxidation state in heterogeneous samples: the case of melt inclusions in olivine from the Hekla volcano |
topic_facet |
info:eu-repo/classification/ddc/550 |
description |
Here we present a confocal Fe K-edge $μ$-XANES method (where XANES stands for X-ray absorption near-edge spectroscopy) for the analysis of Fe oxidation state in heterogeneous and one-side-polished samples. The new technique allows for an analysis of small volumes with high spatial 3D resolution of <100 µm$^3$. The probed volume is restricted to that just beneath the surface of the exposed object. This protocol avoids contamination of the signal by the host material and minimizes self-absorption effects. This technique has been tested on a set of experimental glasses with a wide range of Fe$^{3+}$ $Σ$Fe ratios. The method was applied to the analysis of natural melt inclusions trapped in forsteritic to fayalitic olivine crystals of the Hekla volcano, Iceland. Our measurements reveal changes in Fe$^{3+}$ $Σ$Fe from 0.17 in basaltic up to 0.45 in dacitic melts, whereas the magnetite–ilmenite equilibrium shows redox conditions with Fe$^{3+}$ $Σ$Fe ≤0.20 (close to FMQ, fayalite–magnetite–quartz redox equilibrium) along the entire range of Hekla melt compositions. This discrepancy indicates that the oxidized nature of glasses in the melt inclusions could be related to the post-entrapment process of diffusive hydrogen loss from inclusions and associated oxidation of Fe in the melt. The Fe$^{3+}$ $Σ$Fe ratio in silicic melts is particularly susceptible to this process due to their low FeO content, and it should be critically evaluated before petrological interpretation. |
format |
Article in Journal/Newspaper |
author |
Botcharnikov, Roman Wilke, Max Garrevoet, Jan Portnyagin, Maxim Klimm, Kevin Buhre, Stephan Krasheninnikov, Stepan Almeev, Renat Moune, Severine Falkenberg, Gerald |
author_facet |
Botcharnikov, Roman Wilke, Max Garrevoet, Jan Portnyagin, Maxim Klimm, Kevin Buhre, Stephan Krasheninnikov, Stepan Almeev, Renat Moune, Severine Falkenberg, Gerald |
author_sort |
Botcharnikov, Roman |
title |
Confocal $\mu$-XANES as a tool to analyze Fe oxidation state in heterogeneous samples: the case of melt inclusions in olivine from the Hekla volcano |
title_short |
Confocal $\mu$-XANES as a tool to analyze Fe oxidation state in heterogeneous samples: the case of melt inclusions in olivine from the Hekla volcano |
title_full |
Confocal $\mu$-XANES as a tool to analyze Fe oxidation state in heterogeneous samples: the case of melt inclusions in olivine from the Hekla volcano |
title_fullStr |
Confocal $\mu$-XANES as a tool to analyze Fe oxidation state in heterogeneous samples: the case of melt inclusions in olivine from the Hekla volcano |
title_full_unstemmed |
Confocal $\mu$-XANES as a tool to analyze Fe oxidation state in heterogeneous samples: the case of melt inclusions in olivine from the Hekla volcano |
title_sort |
confocal $\mu$-xanes as a tool to analyze fe oxidation state in heterogeneous samples: the case of melt inclusions in olivine from the hekla volcano |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://bib-pubdb1.desy.de/record/605229 https://bib-pubdb1.desy.de/search?p=id:%22PUBDB-2024-01366%22 |
op_coverage |
DE |
genre |
Hekla Iceland |
genre_facet |
Hekla Iceland |
op_source |
European journal of mineralogy 36(1), 195 - 208 (2024). doi:10.5194/ejm-36-195-2024 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/ejm-36-195-2024 info:eu-repo/semantics/altIdentifier/issn/0935-1221 info:eu-repo/semantics/altIdentifier/doi/10.3204/PUBDB-2024-01366 info:eu-repo/semantics/altIdentifier/issn/1617-4011 https://bib-pubdb1.desy.de/record/605229 https://bib-pubdb1.desy.de/search?p=id:%22PUBDB-2024-01366%22 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/ejm-36-195-202410.3204/PUBDB-2024-01366 |
_version_ |
1799481273662570496 |