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
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 &a...
Published in: | European Journal of Mineralogy |
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2024
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Online Access: | https://doi.org/10.5194/ejm-36-195-2024 https://ejm.copernicus.org/articles/36/195/2024/ |
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ftcopernicus:oai:publications.copernicus.org:ejm112950 2024-09-09T19:43:55+00:00 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 Botcharnikov, Roman Wilke, Max Garrevoet, Jan Portnyagin, Maxim Klimm, Kevin Buhre, Stephan Krasheninnikov, Stepan Almeev, Renat Moune, Severine Falkenberg, Gerald 2024-02-12 application/pdf https://doi.org/10.5194/ejm-36-195-2024 https://ejm.copernicus.org/articles/36/195/2024/ eng eng doi:10.5194/ejm-36-195-2024 https://ejm.copernicus.org/articles/36/195/2024/ eISSN: 1617-4011 Text 2024 ftcopernicus https://doi.org/10.5194/ejm-36-195-2024 2024-08-28T05:24:15Z 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 µ m 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+ / <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="8pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="fb147fccdcf98a9911cf3d26a8f6dc33"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ejm-36-195-2024-ie00001.svg" width="8pt" height="14pt" src="ejm-36-195-2024-ie00001.png"/> </svg:svg> 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+ / <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="8pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="165b352473919034209a9d51d0eaf41d"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ejm-36-195-2024-ie00002.svg" width="8pt" height="14pt" src="ejm-36-195-2024-ie00002.png"/> </svg:svg> 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+ / <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="8pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="539a58614ea8688159b8effbc6d3da8d"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ejm-36-195-2024-ie00003.svg" width="8pt" height="14pt" src="ejm-36-195-2024-ie00003.png"/> </svg:svg> Σ Fe ≤0.20 (close to FMQ, fayalite–magnetite–quartz redox equilibrium) ... Text Hekla Iceland Copernicus Publications: E-Journals European Journal of Mineralogy 36 1 195 208 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
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 µ m 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+ / <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="8pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="fb147fccdcf98a9911cf3d26a8f6dc33"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ejm-36-195-2024-ie00001.svg" width="8pt" height="14pt" src="ejm-36-195-2024-ie00001.png"/> </svg:svg> 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+ / <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="8pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="165b352473919034209a9d51d0eaf41d"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ejm-36-195-2024-ie00002.svg" width="8pt" height="14pt" src="ejm-36-195-2024-ie00002.png"/> </svg:svg> 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+ / <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="8pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="539a58614ea8688159b8effbc6d3da8d"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ejm-36-195-2024-ie00003.svg" width="8pt" height="14pt" src="ejm-36-195-2024-ie00003.png"/> </svg:svg> Σ Fe ≤0.20 (close to FMQ, fayalite–magnetite–quartz redox equilibrium) ... |
format |
Text |
author |
Botcharnikov, Roman Wilke, Max Garrevoet, Jan Portnyagin, Maxim Klimm, Kevin Buhre, Stephan Krasheninnikov, Stepan Almeev, Renat Moune, Severine Falkenberg, Gerald |
spellingShingle |
Botcharnikov, Roman Wilke, Max Garrevoet, Jan Portnyagin, Maxim Klimm, Kevin Buhre, Stephan Krasheninnikov, Stepan Almeev, Renat Moune, Severine Falkenberg, Gerald 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 |
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 μ-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 μ-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 μ-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 μ-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 μ-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 μ-xanes as a tool to analyze fe oxidation state in heterogeneous samples: the case of melt inclusions in olivine from the hekla volcano |
publishDate |
2024 |
url |
https://doi.org/10.5194/ejm-36-195-2024 https://ejm.copernicus.org/articles/36/195/2024/ |
genre |
Hekla Iceland |
genre_facet |
Hekla Iceland |
op_source |
eISSN: 1617-4011 |
op_relation |
doi:10.5194/ejm-36-195-2024 https://ejm.copernicus.org/articles/36/195/2024/ |
op_doi |
https://doi.org/10.5194/ejm-36-195-2024 |
container_title |
European Journal of Mineralogy |
container_volume |
36 |
container_issue |
1 |
container_start_page |
195 |
op_container_end_page |
208 |
_version_ |
1809913621415723008 |