Burial and exhumation of the Long Range Inlier and its surroundings, western Newfoundland: results of an apatite fission-track study
The Long Range Inlier, a steep-sided plateau underlain mainly by Grenvillian gneisses, is the most prominent topographic feature of western Newfoundland. Apatite fission-track analysis of 31 samples from the Long Range Inlier and its surroundings yielded measured apparent ages of 343–152 Ma. Age ver...
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Language: | French |
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1993
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Online Access: | http://dx.doi.org/10.1139/e93-137 http://www.nrcresearchpress.com/doi/pdf/10.1139/e93-137 |
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crcansciencepubl:10.1139/e93-137 2024-09-15T18:19:59+00:00 Burial and exhumation of the Long Range Inlier and its surroundings, western Newfoundland: results of an apatite fission-track study Hendriks, M. Jamieson, R. A. Willett, S. D. Zentilli, M. 1993 http://dx.doi.org/10.1139/e93-137 http://www.nrcresearchpress.com/doi/pdf/10.1139/e93-137 fr fre Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 30, issue 8, page 1594-1606 ISSN 0008-4077 1480-3313 journal-article 1993 crcansciencepubl https://doi.org/10.1139/e93-137 2024-07-25T04:10:06Z The Long Range Inlier, a steep-sided plateau underlain mainly by Grenvillian gneisses, is the most prominent topographic feature of western Newfoundland. Apatite fission-track analysis of 31 samples from the Long Range Inlier and its surroundings yielded measured apparent ages of 343–152 Ma. Age versus elevation plots, track-length distributions, and model thermal histories indicate that the region experienced slow cooling in the late Paleozoic, with apparent exhumation rates of 7–9 m∙Ma −1 and cooling rates of 0.08–0.28 °C∙Ma −1 . Model thermal histories suggest that the present upper surface of the Long Range plateau cooled below ~120 °C in Ordovician times. The thermal histories are compatible with, but do not require, some exhumation of the Long Range Inlier along Acadian thrust faults. Results from Early Carboniferous sedimentary rocks of the Deer Lake Basin are similar to Long Range Inlier data from similar elevations, implying that at some time between ~350 and 300 Ma, the entire region was buried to depths sufficient to induce total annealing (T > 120 °C) in these samples. Closure ages determined from model thermal histories indicate that regional cooling to temperatures below ~120 °C began before 300 Ma. The Carboniferous sedimentary cover was largely removed by Jurassic time, perhaps in response to lowering of regional base level by rifting associated with the opening of the Atlantic Ocean. Article in Journal/Newspaper Newfoundland Canadian Science Publishing Canadian Journal of Earth Sciences 30 8 1594 1606 |
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Canadian Science Publishing |
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French |
description |
The Long Range Inlier, a steep-sided plateau underlain mainly by Grenvillian gneisses, is the most prominent topographic feature of western Newfoundland. Apatite fission-track analysis of 31 samples from the Long Range Inlier and its surroundings yielded measured apparent ages of 343–152 Ma. Age versus elevation plots, track-length distributions, and model thermal histories indicate that the region experienced slow cooling in the late Paleozoic, with apparent exhumation rates of 7–9 m∙Ma −1 and cooling rates of 0.08–0.28 °C∙Ma −1 . Model thermal histories suggest that the present upper surface of the Long Range plateau cooled below ~120 °C in Ordovician times. The thermal histories are compatible with, but do not require, some exhumation of the Long Range Inlier along Acadian thrust faults. Results from Early Carboniferous sedimentary rocks of the Deer Lake Basin are similar to Long Range Inlier data from similar elevations, implying that at some time between ~350 and 300 Ma, the entire region was buried to depths sufficient to induce total annealing (T > 120 °C) in these samples. Closure ages determined from model thermal histories indicate that regional cooling to temperatures below ~120 °C began before 300 Ma. The Carboniferous sedimentary cover was largely removed by Jurassic time, perhaps in response to lowering of regional base level by rifting associated with the opening of the Atlantic Ocean. |
format |
Article in Journal/Newspaper |
author |
Hendriks, M. Jamieson, R. A. Willett, S. D. Zentilli, M. |
spellingShingle |
Hendriks, M. Jamieson, R. A. Willett, S. D. Zentilli, M. Burial and exhumation of the Long Range Inlier and its surroundings, western Newfoundland: results of an apatite fission-track study |
author_facet |
Hendriks, M. Jamieson, R. A. Willett, S. D. Zentilli, M. |
author_sort |
Hendriks, M. |
title |
Burial and exhumation of the Long Range Inlier and its surroundings, western Newfoundland: results of an apatite fission-track study |
title_short |
Burial and exhumation of the Long Range Inlier and its surroundings, western Newfoundland: results of an apatite fission-track study |
title_full |
Burial and exhumation of the Long Range Inlier and its surroundings, western Newfoundland: results of an apatite fission-track study |
title_fullStr |
Burial and exhumation of the Long Range Inlier and its surroundings, western Newfoundland: results of an apatite fission-track study |
title_full_unstemmed |
Burial and exhumation of the Long Range Inlier and its surroundings, western Newfoundland: results of an apatite fission-track study |
title_sort |
burial and exhumation of the long range inlier and its surroundings, western newfoundland: results of an apatite fission-track study |
publisher |
Canadian Science Publishing |
publishDate |
1993 |
url |
http://dx.doi.org/10.1139/e93-137 http://www.nrcresearchpress.com/doi/pdf/10.1139/e93-137 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Canadian Journal of Earth Sciences volume 30, issue 8, page 1594-1606 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e93-137 |
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Canadian Journal of Earth Sciences |
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30 |
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8 |
container_start_page |
1594 |
op_container_end_page |
1606 |
_version_ |
1810458352763797504 |