Vesicles, amygdales and similar structures in fault-generated pseudotachylytes
Amygdales in fault-generated pseudotachylytes from the Outer Hebrides Thrust, Scotland, and the Ikertôq Shear Belt, West Greenland, contain mineral assemblages dominated by K-spar + sphene + epidote + quartz and carbonates respectively. These contrasting assemblages indicate that vesicle infilling t...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/16954 2023-07-23T04:19:29+02:00 Vesicles, amygdales and similar structures in fault-generated pseudotachylytes Maddock, R.H. Grocott, J. Nes, M. van 1987-08 image/pdf https://dspace.library.uu.nl/handle/1874/16954 en eng 0024-4937 https://dspace.library.uu.nl/handle/1874/16954 info:eu-repo/semantics/OpenAccess Aardwetenschappen Article 1987 ftunivutrecht 2023-07-01T23:10:37Z Amygdales in fault-generated pseudotachylytes from the Outer Hebrides Thrust, Scotland, and the Ikertôq Shear Belt, West Greenland, contain mineral assemblages dominated by K-spar + sphene + epidote + quartz and carbonates respectively. These contrasting assemblages indicate that vesicle infilling took place under differing environmental conditions. Other ‘filled cavities’, resembling amygdales in form and mineralogy, are recognized as replacement pseudomorphs after porphyroclasts. Using published data relating vesicle abundance and solubility functions for H2O and CO2 to pressure, a palaeoseismic depth estimate (equivalent to the depth of vesiculation) of about 1.6 km is inferred for the Greenland pseudotachylytes described in this paper. Article in Journal/Newspaper Greenland Utrecht University Repository Greenland |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Aardwetenschappen |
spellingShingle |
Aardwetenschappen Maddock, R.H. Grocott, J. Nes, M. van Vesicles, amygdales and similar structures in fault-generated pseudotachylytes |
topic_facet |
Aardwetenschappen |
description |
Amygdales in fault-generated pseudotachylytes from the Outer Hebrides Thrust, Scotland, and the Ikertôq Shear Belt, West Greenland, contain mineral assemblages dominated by K-spar + sphene + epidote + quartz and carbonates respectively. These contrasting assemblages indicate that vesicle infilling took place under differing environmental conditions. Other ‘filled cavities’, resembling amygdales in form and mineralogy, are recognized as replacement pseudomorphs after porphyroclasts. Using published data relating vesicle abundance and solubility functions for H2O and CO2 to pressure, a palaeoseismic depth estimate (equivalent to the depth of vesiculation) of about 1.6 km is inferred for the Greenland pseudotachylytes described in this paper. |
format |
Article in Journal/Newspaper |
author |
Maddock, R.H. Grocott, J. Nes, M. van |
author_facet |
Maddock, R.H. Grocott, J. Nes, M. van |
author_sort |
Maddock, R.H. |
title |
Vesicles, amygdales and similar structures in fault-generated pseudotachylytes |
title_short |
Vesicles, amygdales and similar structures in fault-generated pseudotachylytes |
title_full |
Vesicles, amygdales and similar structures in fault-generated pseudotachylytes |
title_fullStr |
Vesicles, amygdales and similar structures in fault-generated pseudotachylytes |
title_full_unstemmed |
Vesicles, amygdales and similar structures in fault-generated pseudotachylytes |
title_sort |
vesicles, amygdales and similar structures in fault-generated pseudotachylytes |
publishDate |
1987 |
url |
https://dspace.library.uu.nl/handle/1874/16954 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
0024-4937 https://dspace.library.uu.nl/handle/1874/16954 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772182632878047232 |