Pre-Nagssugtoqidian crustal evolution in West Greenland: geology, geochemistry and deformation of supracrustal and granitic rocks north-east of Kangaatsiaq
The area north-east of Kangaatsiaq features polyphase grey orthogneisses, supracrustal rocks and Kangaatsiaq granite exposed within a WSW–ENE-trending synform. The supracrustal rocks are comprised of garnet-bearing metapelites, layered amphibolites and layered, likewise grey biotite paragneisses. Th...
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ftjgeusbullet:oai:geusjournals.org:article/4915 2023-05-15T16:29:36+02:00 Pre-Nagssugtoqidian crustal evolution in West Greenland: geology, geochemistry and deformation of supracrustal and granitic rocks north-east of Kangaatsiaq Moyen, Jean-François Watt, Gordon R. 2006-12-05 application/pdf https://geusbulletin.org/index.php/geusb/article/view/4915 https://doi.org/10.34194/geusb.v11.4915 eng eng Geological Survey of Denmark and Greenland (GEUS) https://geusbulletin.org/index.php/geusb/article/view/4915/10582 https://geusbulletin.org/index.php/geusb/article/view/4915 doi:10.34194/geusb.v11.4915 GEUS Bulletin; Vol. 11 (2006): Precambrian crustal evolution and Cretaceous-Palaeogene faulting in West Greenland; 33-52 2597-2154 2597-2162 Archaean deformation supracrustal rocks granite Nagssugtoqidian info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article. 2006 ftjgeusbullet https://doi.org/10.34194/geusb.v11.4915 2022-03-15T17:22:19Z The area north-east of Kangaatsiaq features polyphase grey orthogneisses, supracrustal rocks and Kangaatsiaq granite exposed within a WSW–ENE-trending synform. The supracrustal rocks are comprised of garnet-bearing metapelites, layered amphibolites and layered, likewise grey biotite paragneisses. Their association and geochemical compositions are consistent with a metamorphosed volcano-sedimentary basin (containing both tholeiitic and calc-alkali lavas) and is similar to other Archaean greenstone belts. The Kangaatsiaq granite forms a 15 × 3 km flat, subconcordant body of deformed, pink, porphyritic granite occupying the core of the supracrustal synform, and is demonstrably intrusive into the amphibolites. The granite displays a pronounced linear fabric (L or L > S). The post-granite deformation developed under lower amphibolite facies conditions (400 ± 50°C), and is characterised by a regular, NE–SW-trending subhorizontal lineation and an associated irregular foliation, whose poles define a great circle; together they are indicative of highly constrictional strain. The existence of a pre-granite event is attested by early isoclinal folds and a foliation within the amphibolites that is not present in the granite, and by the fact that the granite cuts earlier structures in the supracrustal rocks. This early event, preserved only in quartz-free lithologies, resulted in high-temperature fabrics being developed under upper amphibolite to granulite facies conditions. Article in Journal/Newspaper Greenland Kangaatsiaq GEUS Bulletin (Geological Survey of Denmark and Greenland) Greenland Kangaatsiaq ENVELOPE(-53.464,-53.464,68.306,68.306) Geological Survey of Denmark and Greenland (GEUS) Bulletin 11 33 52 |
institution |
Open Polar |
collection |
GEUS Bulletin (Geological Survey of Denmark and Greenland) |
op_collection_id |
ftjgeusbullet |
language |
English |
topic |
Archaean deformation supracrustal rocks granite Nagssugtoqidian |
spellingShingle |
Archaean deformation supracrustal rocks granite Nagssugtoqidian Moyen, Jean-François Watt, Gordon R. Pre-Nagssugtoqidian crustal evolution in West Greenland: geology, geochemistry and deformation of supracrustal and granitic rocks north-east of Kangaatsiaq |
topic_facet |
Archaean deformation supracrustal rocks granite Nagssugtoqidian |
description |
The area north-east of Kangaatsiaq features polyphase grey orthogneisses, supracrustal rocks and Kangaatsiaq granite exposed within a WSW–ENE-trending synform. The supracrustal rocks are comprised of garnet-bearing metapelites, layered amphibolites and layered, likewise grey biotite paragneisses. Their association and geochemical compositions are consistent with a metamorphosed volcano-sedimentary basin (containing both tholeiitic and calc-alkali lavas) and is similar to other Archaean greenstone belts. The Kangaatsiaq granite forms a 15 × 3 km flat, subconcordant body of deformed, pink, porphyritic granite occupying the core of the supracrustal synform, and is demonstrably intrusive into the amphibolites. The granite displays a pronounced linear fabric (L or L > S). The post-granite deformation developed under lower amphibolite facies conditions (400 ± 50°C), and is characterised by a regular, NE–SW-trending subhorizontal lineation and an associated irregular foliation, whose poles define a great circle; together they are indicative of highly constrictional strain. The existence of a pre-granite event is attested by early isoclinal folds and a foliation within the amphibolites that is not present in the granite, and by the fact that the granite cuts earlier structures in the supracrustal rocks. This early event, preserved only in quartz-free lithologies, resulted in high-temperature fabrics being developed under upper amphibolite to granulite facies conditions. |
format |
Article in Journal/Newspaper |
author |
Moyen, Jean-François Watt, Gordon R. |
author_facet |
Moyen, Jean-François Watt, Gordon R. |
author_sort |
Moyen, Jean-François |
title |
Pre-Nagssugtoqidian crustal evolution in West Greenland: geology, geochemistry and deformation of supracrustal and granitic rocks north-east of Kangaatsiaq |
title_short |
Pre-Nagssugtoqidian crustal evolution in West Greenland: geology, geochemistry and deformation of supracrustal and granitic rocks north-east of Kangaatsiaq |
title_full |
Pre-Nagssugtoqidian crustal evolution in West Greenland: geology, geochemistry and deformation of supracrustal and granitic rocks north-east of Kangaatsiaq |
title_fullStr |
Pre-Nagssugtoqidian crustal evolution in West Greenland: geology, geochemistry and deformation of supracrustal and granitic rocks north-east of Kangaatsiaq |
title_full_unstemmed |
Pre-Nagssugtoqidian crustal evolution in West Greenland: geology, geochemistry and deformation of supracrustal and granitic rocks north-east of Kangaatsiaq |
title_sort |
pre-nagssugtoqidian crustal evolution in west greenland: geology, geochemistry and deformation of supracrustal and granitic rocks north-east of kangaatsiaq |
publisher |
Geological Survey of Denmark and Greenland (GEUS) |
publishDate |
2006 |
url |
https://geusbulletin.org/index.php/geusb/article/view/4915 https://doi.org/10.34194/geusb.v11.4915 |
long_lat |
ENVELOPE(-53.464,-53.464,68.306,68.306) |
geographic |
Greenland Kangaatsiaq |
geographic_facet |
Greenland Kangaatsiaq |
genre |
Greenland Kangaatsiaq |
genre_facet |
Greenland Kangaatsiaq |
op_source |
GEUS Bulletin; Vol. 11 (2006): Precambrian crustal evolution and Cretaceous-Palaeogene faulting in West Greenland; 33-52 2597-2154 2597-2162 |
op_relation |
https://geusbulletin.org/index.php/geusb/article/view/4915/10582 https://geusbulletin.org/index.php/geusb/article/view/4915 doi:10.34194/geusb.v11.4915 |
op_doi |
https://doi.org/10.34194/geusb.v11.4915 |
container_title |
Geological Survey of Denmark and Greenland (GEUS) Bulletin |
container_volume |
11 |
container_start_page |
33 |
op_container_end_page |
52 |
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1766019301080301568 |