Water contents of nominally anhydrous orthopyroxenes from oceanic peridotites determined by SIMS and FTIR
Abstract This study presents new secondary ion mass spectrometry (SIMS) reference materials (RMs) for measuring water contents in nominally anhydrous orthopyroxenes from upper mantle peridotites. The enstatitic reference orthopyroxenes from spinel peridotite xenoliths have Mg#s between 0.83 and 0.86...
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Springer Science and Business Media LLC
2021
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crspringernat:10.1007/s00710-021-00757-9 2023-05-15T15:13:59+02:00 Water contents of nominally anhydrous orthopyroxenes from oceanic peridotites determined by SIMS and FTIR Wenzel, Kirsten T. Wiedenbeck, Michael Gose, Jürgen Rocholl, Alexander Schmädicke, Esther Deutsche Forschungsgemeinschaft Bavarian Equal Opportunities Sponsorship - Realization Equal Opportunities for Women in Research and Teaching Friedrich-Alexander-Universität Erlangen-Nürnberg 2021 http://dx.doi.org/10.1007/s00710-021-00757-9 https://link.springer.com/content/pdf/10.1007/s00710-021-00757-9.pdf https://link.springer.com/article/10.1007/s00710-021-00757-9/fulltext.html en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Mineralogy and Petrology volume 115, issue 6, page 611-630 ISSN 0930-0708 1438-1168 Geochemistry and Petrology Geophysics journal-article 2021 crspringernat https://doi.org/10.1007/s00710-021-00757-9 2022-01-04T14:58:36Z Abstract This study presents new secondary ion mass spectrometry (SIMS) reference materials (RMs) for measuring water contents in nominally anhydrous orthopyroxenes from upper mantle peridotites. The enstatitic reference orthopyroxenes from spinel peridotite xenoliths have Mg#s between 0.83 and 0.86, Al 2 O 3 ranges between 4.02 and 5.56 wt%, and Cr 2 O 3 ranges between 0.21 and 0.69 wt%. Based on Fourier-transform infrared spectroscopy (FTIR) characterizations, the water contents of the eleven reference orthopyroxenes vary from dry to 249 ± 6 µg/g H 2 O. Using these reference grains, a set of orthopyroxene samples obtained from variably altered abyssal spinel peridotites from the Atlantic and Arctic Ridges as well as from the Izu-Bonin-Mariana forearc region was analyzed by SIMS and FTIR regarding their incorporation of water. The major element composition of the sample orthopyroxenes is typical of spinel peridotites from the upper mantle, characterized by Mg#s between 0.90 and 0.92, Al 2 O 3 between 1.66 and 5.34 wt%, and Cr 2 O 3 between 0.62 and 0.96 wt%. Water contents as measured by SIMS range from 68 ± 7 to 261 ± 11 µg/g H 2 O and correlate well with Al 2 O 3 contents (r = 0.80) and Cr#s (r . = -0.89). We also describe in detail an optimized strategy, employing both SIMS and FTIR, for quantifying structural water in highly altered samples such as abyssal peridotite. This approach first analyzes individual oriented grains by polarized FTIR, which provides an overview of alteration. Subsequently, the same grain along with others of the same sample is measured using SIMS, thereby gaining information about homogeneity at the hand sample scale, which is key for understanding the geological history of these rocks. Article in Journal/Newspaper Arctic Springer Nature (via Crossref) Arctic Mineralogy and Petrology |
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Springer Nature (via Crossref) |
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English |
topic |
Geochemistry and Petrology Geophysics |
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Geochemistry and Petrology Geophysics Wenzel, Kirsten T. Wiedenbeck, Michael Gose, Jürgen Rocholl, Alexander Schmädicke, Esther Water contents of nominally anhydrous orthopyroxenes from oceanic peridotites determined by SIMS and FTIR |
topic_facet |
Geochemistry and Petrology Geophysics |
description |
Abstract This study presents new secondary ion mass spectrometry (SIMS) reference materials (RMs) for measuring water contents in nominally anhydrous orthopyroxenes from upper mantle peridotites. The enstatitic reference orthopyroxenes from spinel peridotite xenoliths have Mg#s between 0.83 and 0.86, Al 2 O 3 ranges between 4.02 and 5.56 wt%, and Cr 2 O 3 ranges between 0.21 and 0.69 wt%. Based on Fourier-transform infrared spectroscopy (FTIR) characterizations, the water contents of the eleven reference orthopyroxenes vary from dry to 249 ± 6 µg/g H 2 O. Using these reference grains, a set of orthopyroxene samples obtained from variably altered abyssal spinel peridotites from the Atlantic and Arctic Ridges as well as from the Izu-Bonin-Mariana forearc region was analyzed by SIMS and FTIR regarding their incorporation of water. The major element composition of the sample orthopyroxenes is typical of spinel peridotites from the upper mantle, characterized by Mg#s between 0.90 and 0.92, Al 2 O 3 between 1.66 and 5.34 wt%, and Cr 2 O 3 between 0.62 and 0.96 wt%. Water contents as measured by SIMS range from 68 ± 7 to 261 ± 11 µg/g H 2 O and correlate well with Al 2 O 3 contents (r = 0.80) and Cr#s (r . = -0.89). We also describe in detail an optimized strategy, employing both SIMS and FTIR, for quantifying structural water in highly altered samples such as abyssal peridotite. This approach first analyzes individual oriented grains by polarized FTIR, which provides an overview of alteration. Subsequently, the same grain along with others of the same sample is measured using SIMS, thereby gaining information about homogeneity at the hand sample scale, which is key for understanding the geological history of these rocks. |
author2 |
Deutsche Forschungsgemeinschaft Bavarian Equal Opportunities Sponsorship - Realization Equal Opportunities for Women in Research and Teaching Friedrich-Alexander-Universität Erlangen-Nürnberg |
format |
Article in Journal/Newspaper |
author |
Wenzel, Kirsten T. Wiedenbeck, Michael Gose, Jürgen Rocholl, Alexander Schmädicke, Esther |
author_facet |
Wenzel, Kirsten T. Wiedenbeck, Michael Gose, Jürgen Rocholl, Alexander Schmädicke, Esther |
author_sort |
Wenzel, Kirsten T. |
title |
Water contents of nominally anhydrous orthopyroxenes from oceanic peridotites determined by SIMS and FTIR |
title_short |
Water contents of nominally anhydrous orthopyroxenes from oceanic peridotites determined by SIMS and FTIR |
title_full |
Water contents of nominally anhydrous orthopyroxenes from oceanic peridotites determined by SIMS and FTIR |
title_fullStr |
Water contents of nominally anhydrous orthopyroxenes from oceanic peridotites determined by SIMS and FTIR |
title_full_unstemmed |
Water contents of nominally anhydrous orthopyroxenes from oceanic peridotites determined by SIMS and FTIR |
title_sort |
water contents of nominally anhydrous orthopyroxenes from oceanic peridotites determined by sims and ftir |
publisher |
Springer Science and Business Media LLC |
publishDate |
2021 |
url |
http://dx.doi.org/10.1007/s00710-021-00757-9 https://link.springer.com/content/pdf/10.1007/s00710-021-00757-9.pdf https://link.springer.com/article/10.1007/s00710-021-00757-9/fulltext.html |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Mineralogy and Petrology volume 115, issue 6, page 611-630 ISSN 0930-0708 1438-1168 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1007/s00710-021-00757-9 |
container_title |
Mineralogy and Petrology |
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1766344491371855872 |