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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Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7898121/ http://www.ncbi.nlm.nih.gov/pubmed/33517873 https://doi.org/10.1098/rsta.2019.0423 |
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ftpubmed:oai:pubmedcentral.nih.gov:7898121 2023-05-15T17:08:14+02:00 Pristine microstructures in pseudotachylytes formed in dry lower crust, Lofoten, Norway Dunkel, Kristina G. Morales, Luiz F. G. Jamtveit, Bjørn 2021-03-22 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7898121/ http://www.ncbi.nlm.nih.gov/pubmed/33517873 https://doi.org/10.1098/rsta.2019.0423 en eng The Royal Society Publishing http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7898121/ http://www.ncbi.nlm.nih.gov/pubmed/33517873 http://dx.doi.org/10.1098/rsta.2019.0423 © 2021 The Authors. http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/http://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited. CC-BY Philos Trans A Math Phys Eng Sci Articles Text 2021 ftpubmed https://doi.org/10.1098/rsta.2019.0423 2021-02-28T01:38:32Z 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’. Text Lofoten Moskenesøya PubMed Central (PMC) 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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Articles Dunkel, Kristina G. Morales, Luiz F. G. Jamtveit, Bjørn Pristine microstructures in pseudotachylytes formed in dry lower crust, Lofoten, Norway |
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Articles |
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’. |
format |
Text |
author |
Dunkel, Kristina G. Morales, Luiz F. G. Jamtveit, Bjørn |
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 Publishing |
publishDate |
2021 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7898121/ http://www.ncbi.nlm.nih.gov/pubmed/33517873 https://doi.org/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 |
Philos Trans A Math Phys Eng Sci |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7898121/ http://www.ncbi.nlm.nih.gov/pubmed/33517873 http://dx.doi.org/10.1098/rsta.2019.0423 |
op_rights |
© 2021 The Authors. http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/http://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited. |
op_rightsnorm |
CC-BY |
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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