Late Cretaceous bimodal magmatism,northern Ellesmere Island:isotopic age and origin
In the Yelverton Bay region of northwestern Ellesmere Island, bimodal intrusive and volcanic rocks are associated with a major fault in the Proterozoic–Cambrian rocks of the Pearya Terrane. The Wootton intrusion consists mainly of gabbro with lesser amounts of granitic and hybrid rocks; the Hansen P...
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Language: | English |
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Canadian Science Publishing
1987
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Online Access: | http://dx.doi.org/10.1139/e87-027 http://www.nrcresearchpress.com/doi/pdf/10.1139/e87-027 |
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crcansciencepubl:10.1139/e87-027 2024-09-15T17:56:52+00:00 Late Cretaceous bimodal magmatism,northern Ellesmere Island:isotopic age and origin Trettin, H. P. Parrish, R. 1987 http://dx.doi.org/10.1139/e87-027 http://www.nrcresearchpress.com/doi/pdf/10.1139/e87-027 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 24, issue 2, page 257-265 ISSN 0008-4077 1480-3313 journal-article 1987 crcansciencepubl https://doi.org/10.1139/e87-027 2024-07-25T04:10:03Z In the Yelverton Bay region of northwestern Ellesmere Island, bimodal intrusive and volcanic rocks are associated with a major fault in the Proterozoic–Cambrian rocks of the Pearya Terrane. The Wootton intrusion consists mainly of gabbro with lesser amounts of granitic and hybrid rocks; the Hansen Point volcanics are composed of felsic rocks and basalt. Plutonic zircons are very slightly discordant, but volcanic zircons have unusually high degrees of inheritance. Interpreted U/Pb zircon ages of 92.0 ± 1.0 Ma for the Wootton intrusion (assuming a wide range of inheritance ages) and of [Formula: see text] for the Hansen Point volcanics are close to the 93 Ma average of hornblende K/Ar dates obtained earlier for a small quartz diorite pluton in central northernmost Ellesmere Island. All fall into the early Late Cretaceous and indicate correlation with mafic volcanics of the Cenomanian–Turonian Strand Fiord Formation of eastern Axel Heiberg Island. The upper intercept age for the Hansen Point volcanics ([Formula: see text]) suggests that the felsic component in the bimodal suites was in part derived from the upper Middle Proterozoic (Neohelikian) basement gneiss. Limited field observations on the Wootton intrusion also are compatible with the hypothesis that the granitic component represents sialic basement, melted by mafic intrusion at depth during an extensional tectonic regime. Article in Journal/Newspaper Axel Heiberg Island Ellesmere Island Yelverton Bay Canadian Science Publishing Canadian Journal of Earth Sciences 24 2 257 265 |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
description |
In the Yelverton Bay region of northwestern Ellesmere Island, bimodal intrusive and volcanic rocks are associated with a major fault in the Proterozoic–Cambrian rocks of the Pearya Terrane. The Wootton intrusion consists mainly of gabbro with lesser amounts of granitic and hybrid rocks; the Hansen Point volcanics are composed of felsic rocks and basalt. Plutonic zircons are very slightly discordant, but volcanic zircons have unusually high degrees of inheritance. Interpreted U/Pb zircon ages of 92.0 ± 1.0 Ma for the Wootton intrusion (assuming a wide range of inheritance ages) and of [Formula: see text] for the Hansen Point volcanics are close to the 93 Ma average of hornblende K/Ar dates obtained earlier for a small quartz diorite pluton in central northernmost Ellesmere Island. All fall into the early Late Cretaceous and indicate correlation with mafic volcanics of the Cenomanian–Turonian Strand Fiord Formation of eastern Axel Heiberg Island. The upper intercept age for the Hansen Point volcanics ([Formula: see text]) suggests that the felsic component in the bimodal suites was in part derived from the upper Middle Proterozoic (Neohelikian) basement gneiss. Limited field observations on the Wootton intrusion also are compatible with the hypothesis that the granitic component represents sialic basement, melted by mafic intrusion at depth during an extensional tectonic regime. |
format |
Article in Journal/Newspaper |
author |
Trettin, H. P. Parrish, R. |
spellingShingle |
Trettin, H. P. Parrish, R. Late Cretaceous bimodal magmatism,northern Ellesmere Island:isotopic age and origin |
author_facet |
Trettin, H. P. Parrish, R. |
author_sort |
Trettin, H. P. |
title |
Late Cretaceous bimodal magmatism,northern Ellesmere Island:isotopic age and origin |
title_short |
Late Cretaceous bimodal magmatism,northern Ellesmere Island:isotopic age and origin |
title_full |
Late Cretaceous bimodal magmatism,northern Ellesmere Island:isotopic age and origin |
title_fullStr |
Late Cretaceous bimodal magmatism,northern Ellesmere Island:isotopic age and origin |
title_full_unstemmed |
Late Cretaceous bimodal magmatism,northern Ellesmere Island:isotopic age and origin |
title_sort |
late cretaceous bimodal magmatism,northern ellesmere island:isotopic age and origin |
publisher |
Canadian Science Publishing |
publishDate |
1987 |
url |
http://dx.doi.org/10.1139/e87-027 http://www.nrcresearchpress.com/doi/pdf/10.1139/e87-027 |
genre |
Axel Heiberg Island Ellesmere Island Yelverton Bay |
genre_facet |
Axel Heiberg Island Ellesmere Island Yelverton Bay |
op_source |
Canadian Journal of Earth Sciences volume 24, issue 2, page 257-265 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e87-027 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
24 |
container_issue |
2 |
container_start_page |
257 |
op_container_end_page |
265 |
_version_ |
1810433040894132224 |