Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland Caledonides
The Charcot Land tectonic window exposes crystalline basement gneisses, which form part of the foreland of the East Greenland Caledonides. These gneisses were previously believed to be Archaean in age, on the basis of imprecise K-Ar analyses carried out in the early 1980s on hornblende from amphibol...
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ftjgeusbullet:oai:geusjournals.org:article/4818 2023-05-15T15:54:02+02:00 Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland Caledonides Thrane, Kristine 2004-12-30 application/pdf https://geusbulletin.org/index.php/geusb/article/view/4818 https://doi.org/10.34194/geusb.v6.4818 eng eng Geological Survey of Denmark and Greenland (GEUS) https://geusbulletin.org/index.php/geusb/article/view/4818/10454 https://geusbulletin.org/index.php/geusb/article/view/4818 doi:10.34194/geusb.v6.4818 GEUS Bulletin; Vol. 6 (2004): East Greenland Caledonides, stratigraphy, structure and geochronology; 57-66 2597-2154 2597-2162 Caledonides East Greenland geochronology Palaeoproterozoic info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article. 2004 ftjgeusbullet https://doi.org/10.34194/geusb.v6.4818 2022-03-15T17:22:15Z The Charcot Land tectonic window exposes crystalline basement gneisses, which form part of the foreland of the East Greenland Caledonides. These gneisses were previously believed to be Archaean in age, on the basis of imprecise K-Ar analyses carried out in the early 1980s on hornblende from amphibolitic bands and inconclusive Rb/Sr isotope data. New U-Pb singlezircon ion microprobe analyses on the gneisses of the window yield upper intercept ages of 1916 ± 21 and 1928 ± 11 Ma, and are interpreted to represent the age of crystallisation of the igneous protolith. The foreland gneisses of the Charcot Land window are similar in age to parts of the allochthonous gneiss complexes of structurally overlying thrust sheets, but the two terranes have different lithological and structural characteristics. No Archaean rocks have been identified with certainty in any of the East Greenland Caledonian foreland windows. Article in Journal/Newspaper Charcot Land East Greenland Greenland GEUS Bulletin (Geological Survey of Denmark and Greenland) Greenland Charcot ENVELOPE(139.017,139.017,-69.367,-69.367) Charcot Land ENVELOPE(-29.000,-29.000,72.033,72.033) Geological Survey of Denmark and Greenland (GEUS) Bulletin 6 57 66 |
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Open Polar |
collection |
GEUS Bulletin (Geological Survey of Denmark and Greenland) |
op_collection_id |
ftjgeusbullet |
language |
English |
topic |
Caledonides East Greenland geochronology Palaeoproterozoic |
spellingShingle |
Caledonides East Greenland geochronology Palaeoproterozoic Thrane, Kristine Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland Caledonides |
topic_facet |
Caledonides East Greenland geochronology Palaeoproterozoic |
description |
The Charcot Land tectonic window exposes crystalline basement gneisses, which form part of the foreland of the East Greenland Caledonides. These gneisses were previously believed to be Archaean in age, on the basis of imprecise K-Ar analyses carried out in the early 1980s on hornblende from amphibolitic bands and inconclusive Rb/Sr isotope data. New U-Pb singlezircon ion microprobe analyses on the gneisses of the window yield upper intercept ages of 1916 ± 21 and 1928 ± 11 Ma, and are interpreted to represent the age of crystallisation of the igneous protolith. The foreland gneisses of the Charcot Land window are similar in age to parts of the allochthonous gneiss complexes of structurally overlying thrust sheets, but the two terranes have different lithological and structural characteristics. No Archaean rocks have been identified with certainty in any of the East Greenland Caledonian foreland windows. |
format |
Article in Journal/Newspaper |
author |
Thrane, Kristine |
author_facet |
Thrane, Kristine |
author_sort |
Thrane, Kristine |
title |
Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland Caledonides |
title_short |
Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland Caledonides |
title_full |
Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland Caledonides |
title_fullStr |
Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland Caledonides |
title_full_unstemmed |
Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland Caledonides |
title_sort |
palaeoproterozoic age of a basement gneiss complex in the charcot land tectonic window, east greenland caledonides |
publisher |
Geological Survey of Denmark and Greenland (GEUS) |
publishDate |
2004 |
url |
https://geusbulletin.org/index.php/geusb/article/view/4818 https://doi.org/10.34194/geusb.v6.4818 |
long_lat |
ENVELOPE(139.017,139.017,-69.367,-69.367) ENVELOPE(-29.000,-29.000,72.033,72.033) |
geographic |
Greenland Charcot Charcot Land |
geographic_facet |
Greenland Charcot Charcot Land |
genre |
Charcot Land East Greenland Greenland |
genre_facet |
Charcot Land East Greenland Greenland |
op_source |
GEUS Bulletin; Vol. 6 (2004): East Greenland Caledonides, stratigraphy, structure and geochronology; 57-66 2597-2154 2597-2162 |
op_relation |
https://geusbulletin.org/index.php/geusb/article/view/4818/10454 https://geusbulletin.org/index.php/geusb/article/view/4818 doi:10.34194/geusb.v6.4818 |
op_doi |
https://doi.org/10.34194/geusb.v6.4818 |
container_title |
Geological Survey of Denmark and Greenland (GEUS) Bulletin |
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6 |
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57 |
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66 |
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1766389203853115392 |