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...
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ftdatacite:10.3929/ethz-b-000470677 2024-04-28T08:27:52+00:00 Pristine microstructures in pseudotachylytes formed in dry lower crust, Lofoten, Norway ... Dunkel, Kristina G. Morales, Luiz F.G. Jamtveit, Bjørn 2021 application/pdf https://dx.doi.org/10.3929/ethz-b-000470677 http://hdl.handle.net/20.500.11850/470677 en eng ETH Zurich info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 article-journal Text ScholarlyArticle Journal Article 2021 ftdatacite https://doi.org/10.3929/ethz-b-000470677 2024-04-02T12:34:54Z 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'. ... : Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences, 379 (2193) ... Article in Journal/Newspaper Lofoten Moskenesøya DataCite Metadata Store (German National Library of Science and Technology) |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
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ftdatacite |
language |
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'. ... : Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences, 379 (2193) ... |
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 |
ETH Zurich |
publishDate |
2021 |
url |
https://dx.doi.org/10.3929/ethz-b-000470677 http://hdl.handle.net/20.500.11850/470677 |
genre |
Lofoten Moskenesøya |
genre_facet |
Lofoten Moskenesøya |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_doi |
https://doi.org/10.3929/ethz-b-000470677 |
_version_ |
1797586620499623936 |