Pristine microstructures in pseudotachylytes formed in dry lower crust, Lofoten, Norway
Feldspar-rich pseudotachylytes from the island of Moskenesøya, Lofoten, formed in dry granulites under lower crustal conditions during the Caledonian orogeny. The central parts of the pseudotachylytes, where the cooling rates were slowest, are characterized by microlites and spherulites of plagiocla...
Published in: | Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
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crroyalsociety:10.1098/rsta.2019.0423 2024-06-02T08:10:09+00:00 Pristine microstructures in pseudotachylytes formed in dry lower crust, Lofoten, Norway Dunkel, Kristina G. Morales, Luiz F. G. Jamtveit, Bjørn H2020 European Research Council 2021 http://dx.doi.org/10.1098/rsta.2019.0423 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2019.0423 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsta.2019.0423 en eng The Royal Society http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences volume 379, issue 2193, page 20190423 ISSN 1364-503X 1471-2962 journal-article 2021 crroyalsociety https://doi.org/10.1098/rsta.2019.0423 2024-05-07T14:16:04Z Feldspar-rich pseudotachylytes from the island of Moskenesøya, Lofoten, formed in dry granulites under lower crustal conditions during the Caledonian orogeny. The central parts of the pseudotachylytes, where the cooling rates were slowest, are characterized by microlites and spherulites of plagioclase and K-feldspar. K-feldspar surrounding plagioclase is consistent with crystallization from a melt during cooling instead of devitrification as the origin of the spherulites. Very thin (a few micrometres wide) injection veins, which experienced very rapid quenching, contain amorphous or cryptocrystalline material. The preservation of this material and of the fine-grained microstructures shows that, under fluid-absent conditions, recrystallization and reactions are slow and the original microstructures of the pseudotachylytes can be preserved. This article is part of a discussion meeting issue ‘Understanding earthquakes using the geological record’. Article in Journal/Newspaper Lofoten Moskenesøya The Royal Society Lofoten Moskenesøya ENVELOPE(13.000,13.000,67.983,67.983) Norway Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 379 2193 20190423 |
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Open Polar |
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The Royal Society |
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crroyalsociety |
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English |
description |
Feldspar-rich pseudotachylytes from the island of Moskenesøya, Lofoten, formed in dry granulites under lower crustal conditions during the Caledonian orogeny. The central parts of the pseudotachylytes, where the cooling rates were slowest, are characterized by microlites and spherulites of plagioclase and K-feldspar. K-feldspar surrounding plagioclase is consistent with crystallization from a melt during cooling instead of devitrification as the origin of the spherulites. Very thin (a few micrometres wide) injection veins, which experienced very rapid quenching, contain amorphous or cryptocrystalline material. The preservation of this material and of the fine-grained microstructures shows that, under fluid-absent conditions, recrystallization and reactions are slow and the original microstructures of the pseudotachylytes can be preserved. This article is part of a discussion meeting issue ‘Understanding earthquakes using the geological record’. |
author2 |
H2020 European Research Council |
format |
Article in Journal/Newspaper |
author |
Dunkel, Kristina G. Morales, Luiz F. G. Jamtveit, Bjørn |
spellingShingle |
Dunkel, Kristina G. Morales, Luiz F. G. Jamtveit, Bjørn Pristine microstructures in pseudotachylytes formed in dry lower crust, Lofoten, Norway |
author_facet |
Dunkel, Kristina G. Morales, Luiz F. G. Jamtveit, Bjørn |
author_sort |
Dunkel, Kristina G. |
title |
Pristine microstructures in pseudotachylytes formed in dry lower crust, Lofoten, Norway |
title_short |
Pristine microstructures in pseudotachylytes formed in dry lower crust, Lofoten, Norway |
title_full |
Pristine microstructures in pseudotachylytes formed in dry lower crust, Lofoten, Norway |
title_fullStr |
Pristine microstructures in pseudotachylytes formed in dry lower crust, Lofoten, Norway |
title_full_unstemmed |
Pristine microstructures in pseudotachylytes formed in dry lower crust, Lofoten, Norway |
title_sort |
pristine microstructures in pseudotachylytes formed in dry lower crust, lofoten, norway |
publisher |
The Royal Society |
publishDate |
2021 |
url |
http://dx.doi.org/10.1098/rsta.2019.0423 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2019.0423 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsta.2019.0423 |
long_lat |
ENVELOPE(13.000,13.000,67.983,67.983) |
geographic |
Lofoten Moskenesøya Norway |
geographic_facet |
Lofoten Moskenesøya Norway |
genre |
Lofoten Moskenesøya |
genre_facet |
Lofoten Moskenesøya |
op_source |
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences volume 379, issue 2193, page 20190423 ISSN 1364-503X 1471-2962 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1098/rsta.2019.0423 |
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Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
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379 |
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2193 |
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20190423 |
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