Low-Pressure Granulites from the Ketilidian Mobile Belt of Southern Greenland
Early Proterozoic cordierite-garnet–orthopyroxene–K–feldspar metasedimentary gneisses are developed in the flat—lying complex (FLC) of the southern part of the Ketilidian mobile belt (1�8–1�7GA), Greenland. These granulites contain low—pressure assemblages and are developed in both regional metamorp...
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1991
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fthighwire:oai:open-archive.highwire.org:petrology:32/5/979 2023-05-15T16:27:28+02:00 Low-Pressure Granulites from the Ketilidian Mobile Belt of Southern Greenland DEMPSTER, T. J. HARRISON, T. N. BROWN, P. E. HUTTON, D. H 1991-10-01 00:00:00.0 text/html http://petrology.oxfordjournals.org/cgi/content/short/32/5/979 https://doi.org/10.1093/petrology/32.5.979 en eng Oxford University Press http://petrology.oxfordjournals.org/cgi/content/short/32/5/979 http://dx.doi.org/10.1093/petrology/32.5.979 Copyright (C) 1991, Oxford University Press Articles TEXT 1991 fthighwire https://doi.org/10.1093/petrology/32.5.979 2013-05-27T05:02:42Z Early Proterozoic cordierite-garnet–orthopyroxene–K–feldspar metasedimentary gneisses are developed in the flat—lying complex (FLC) of the southern part of the Ketilidian mobile belt (1�8–1�7GA), Greenland. These granulites contain low—pressure assemblages and are developed in both regional metamorphic rocks and in some thermal aureoles of contemporaneous rapakivi granite plutons. Thermobarometry shows that both the regional and contact metamorphism took place at 2–4 kb and 650–800�C. The granulites were developed in an extensional tectonic regime, and appartently record the culmination of a single thermotectonic event. There is a close temporal association between the peak of high—grade metamorphism and the emplacement of synorogenic rapakivi granites, and melts from the metasedimentary pile probably contributed largely to the granites. The low pressures and high temperatures for regional metamorphism require geothermal gradients in excess of 60�C/km, and are consistent with the presence of regional extensional tectonics, synorogenic magmatism, and underplating of mafic magma in this area during the Ketilidian. Text Greenland HighWire Press (Stanford University) Greenland Journal of Petrology 32 5 979 1004 |
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English |
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Articles DEMPSTER, T. J. HARRISON, T. N. BROWN, P. E. HUTTON, D. H Low-Pressure Granulites from the Ketilidian Mobile Belt of Southern Greenland |
topic_facet |
Articles |
description |
Early Proterozoic cordierite-garnet–orthopyroxene–K–feldspar metasedimentary gneisses are developed in the flat—lying complex (FLC) of the southern part of the Ketilidian mobile belt (1�8–1�7GA), Greenland. These granulites contain low—pressure assemblages and are developed in both regional metamorphic rocks and in some thermal aureoles of contemporaneous rapakivi granite plutons. Thermobarometry shows that both the regional and contact metamorphism took place at 2–4 kb and 650–800�C. The granulites were developed in an extensional tectonic regime, and appartently record the culmination of a single thermotectonic event. There is a close temporal association between the peak of high—grade metamorphism and the emplacement of synorogenic rapakivi granites, and melts from the metasedimentary pile probably contributed largely to the granites. The low pressures and high temperatures for regional metamorphism require geothermal gradients in excess of 60�C/km, and are consistent with the presence of regional extensional tectonics, synorogenic magmatism, and underplating of mafic magma in this area during the Ketilidian. |
format |
Text |
author |
DEMPSTER, T. J. HARRISON, T. N. BROWN, P. E. HUTTON, D. H |
author_facet |
DEMPSTER, T. J. HARRISON, T. N. BROWN, P. E. HUTTON, D. H |
author_sort |
DEMPSTER, T. J. |
title |
Low-Pressure Granulites from the Ketilidian Mobile Belt of Southern Greenland |
title_short |
Low-Pressure Granulites from the Ketilidian Mobile Belt of Southern Greenland |
title_full |
Low-Pressure Granulites from the Ketilidian Mobile Belt of Southern Greenland |
title_fullStr |
Low-Pressure Granulites from the Ketilidian Mobile Belt of Southern Greenland |
title_full_unstemmed |
Low-Pressure Granulites from the Ketilidian Mobile Belt of Southern Greenland |
title_sort |
low-pressure granulites from the ketilidian mobile belt of southern greenland |
publisher |
Oxford University Press |
publishDate |
1991 |
url |
http://petrology.oxfordjournals.org/cgi/content/short/32/5/979 https://doi.org/10.1093/petrology/32.5.979 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
http://petrology.oxfordjournals.org/cgi/content/short/32/5/979 http://dx.doi.org/10.1093/petrology/32.5.979 |
op_rights |
Copyright (C) 1991, Oxford University Press |
op_doi |
https://doi.org/10.1093/petrology/32.5.979 |
container_title |
Journal of Petrology |
container_volume |
32 |
container_issue |
5 |
container_start_page |
979 |
op_container_end_page |
1004 |
_version_ |
1766016645556338688 |