U–Pb age determinations on Proterozoic to Devonian rocks from northern Ellesmere Island, Arctic Canada
This paper presents age determinations on six units of the Franklinian deep-water basin and the Pearya Terrane of northern Ellmere Island and discusses their tectonic implications.Four different fractions of detrital zircon from the Lower Cambrian Grant Land Formation of the deep-water basin all hav...
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1987
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crcansciencepubl:10.1139/e87-026 2024-06-23T07:50:38+00:00 U–Pb age determinations on Proterozoic to Devonian rocks from northern Ellesmere Island, Arctic Canada Trettin, H. P. Parrish, R. Loveridge, W. D. 1987 http://dx.doi.org/10.1139/e87-026 http://www.nrcresearchpress.com/doi/pdf/10.1139/e87-026 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 24, issue 2, page 246-256 ISSN 0008-4077 1480-3313 journal-article 1987 crcansciencepubl https://doi.org/10.1139/e87-026 2024-05-30T08:13:48Z This paper presents age determinations on six units of the Franklinian deep-water basin and the Pearya Terrane of northern Ellmere Island and discusses their tectonic implications.Four different fractions of detrital zircon from the Lower Cambrian Grant Land Formation of the deep-water basin all have average 207 Pb/ 206 Pb ages of 2.2–2.4 Ga, suggesting that the sediments were derived mainly from Aphebian–Archean parts of the Canadian Shield rather than from the Neohelikian crystalline basement of Pearya, as assumed earlier. The first evidence for Ordovician arc-type volcanism in the northern part of the deep-water basin is provided by a Llandeilo(?) zircon age of [Formula: see text] but the fault-bounded volcanic unit could be exotic.Four major stratigraphic successions are recognized in Pearya. Present zircon studies confirm that succession I has been affected by a 1.0–1.1 Ga orogeny, as inferred earlier by Sinha and Frisch from a Rb–Sr isochron. A zircon age of [Formula: see text] on a rhyolite demonstrates that succession II extended into the Late Cambrian or Early Ordovician.Granitic intrusions in the Pearya Terrane, at Cape Richards and Cape Woods, are, respectively, Middle Ordovician (463 ± 5 Ma) and Devonian (382 ± 18 Ma or, more likely, 390 ± 10 Ma) in age on the basis of combined zircon and sphene determinations. They are post-tectonic with regard to major deformations in the Middle Ordovician and Late Silurian. Both have a significant component of xenocrystic zircon, which appears to have been derived from succession I of Pearya on the basis of upper intercept ages. Article in Journal/Newspaper Arctic Ellesmere Island Canadian Science Publishing Arctic Ellesmere Island Canada Sinha ENVELOPE(-136.150,-136.150,-75.067,-75.067) Cape Richards ENVELOPE(-79.279,-79.279,82.986,82.986) Cape Woods ENVELOPE(-86.666,-86.666,82.219,82.219) Canadian Journal of Earth Sciences 24 2 246 256 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
This paper presents age determinations on six units of the Franklinian deep-water basin and the Pearya Terrane of northern Ellmere Island and discusses their tectonic implications.Four different fractions of detrital zircon from the Lower Cambrian Grant Land Formation of the deep-water basin all have average 207 Pb/ 206 Pb ages of 2.2–2.4 Ga, suggesting that the sediments were derived mainly from Aphebian–Archean parts of the Canadian Shield rather than from the Neohelikian crystalline basement of Pearya, as assumed earlier. The first evidence for Ordovician arc-type volcanism in the northern part of the deep-water basin is provided by a Llandeilo(?) zircon age of [Formula: see text] but the fault-bounded volcanic unit could be exotic.Four major stratigraphic successions are recognized in Pearya. Present zircon studies confirm that succession I has been affected by a 1.0–1.1 Ga orogeny, as inferred earlier by Sinha and Frisch from a Rb–Sr isochron. A zircon age of [Formula: see text] on a rhyolite demonstrates that succession II extended into the Late Cambrian or Early Ordovician.Granitic intrusions in the Pearya Terrane, at Cape Richards and Cape Woods, are, respectively, Middle Ordovician (463 ± 5 Ma) and Devonian (382 ± 18 Ma or, more likely, 390 ± 10 Ma) in age on the basis of combined zircon and sphene determinations. They are post-tectonic with regard to major deformations in the Middle Ordovician and Late Silurian. Both have a significant component of xenocrystic zircon, which appears to have been derived from succession I of Pearya on the basis of upper intercept ages. |
format |
Article in Journal/Newspaper |
author |
Trettin, H. P. Parrish, R. Loveridge, W. D. |
spellingShingle |
Trettin, H. P. Parrish, R. Loveridge, W. D. U–Pb age determinations on Proterozoic to Devonian rocks from northern Ellesmere Island, Arctic Canada |
author_facet |
Trettin, H. P. Parrish, R. Loveridge, W. D. |
author_sort |
Trettin, H. P. |
title |
U–Pb age determinations on Proterozoic to Devonian rocks from northern Ellesmere Island, Arctic Canada |
title_short |
U–Pb age determinations on Proterozoic to Devonian rocks from northern Ellesmere Island, Arctic Canada |
title_full |
U–Pb age determinations on Proterozoic to Devonian rocks from northern Ellesmere Island, Arctic Canada |
title_fullStr |
U–Pb age determinations on Proterozoic to Devonian rocks from northern Ellesmere Island, Arctic Canada |
title_full_unstemmed |
U–Pb age determinations on Proterozoic to Devonian rocks from northern Ellesmere Island, Arctic Canada |
title_sort |
u–pb age determinations on proterozoic to devonian rocks from northern ellesmere island, arctic canada |
publisher |
Canadian Science Publishing |
publishDate |
1987 |
url |
http://dx.doi.org/10.1139/e87-026 http://www.nrcresearchpress.com/doi/pdf/10.1139/e87-026 |
long_lat |
ENVELOPE(-136.150,-136.150,-75.067,-75.067) ENVELOPE(-79.279,-79.279,82.986,82.986) ENVELOPE(-86.666,-86.666,82.219,82.219) |
geographic |
Arctic Ellesmere Island Canada Sinha Cape Richards Cape Woods |
geographic_facet |
Arctic Ellesmere Island Canada Sinha Cape Richards Cape Woods |
genre |
Arctic Ellesmere Island |
genre_facet |
Arctic Ellesmere Island |
op_source |
Canadian Journal of Earth Sciences volume 24, issue 2, page 246-256 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e87-026 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
24 |
container_issue |
2 |
container_start_page |
246 |
op_container_end_page |
256 |
_version_ |
1802641555471728640 |