The Nares Strait gravity anomaly and its implications for crustal structure
A negative free-air gravity anomaly is associated with Nares Strait, the waterway that separates Ellesmere Island and Greenland. Two east–west gravity profiles that cross Ellesmere Island and Nares Strait were collected. A low with values in the range of −100 to −120 mGal (−1000 to −1200 μm/s 2 ) wa...
Published in: | Canadian Journal of Earth Sciences |
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Language: | English |
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Canadian Science Publishing
1985
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Online Access: | http://dx.doi.org/10.1139/e85-136 http://www.nrcresearchpress.com/doi/pdf/10.1139/e85-136 |
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crcansciencepubl:10.1139/e85-136 2024-09-15T18:04:45+00:00 The Nares Strait gravity anomaly and its implications for crustal structure Jackson, H. R. Koppen, L. 1985 http://dx.doi.org/10.1139/e85-136 http://www.nrcresearchpress.com/doi/pdf/10.1139/e85-136 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 22, issue 9, page 1322-1328 ISSN 0008-4077 1480-3313 journal-article 1985 crcansciencepubl https://doi.org/10.1139/e85-136 2024-07-25T04:10:07Z A negative free-air gravity anomaly is associated with Nares Strait, the waterway that separates Ellesmere Island and Greenland. Two east–west gravity profiles that cross Ellesmere Island and Nares Strait were collected. A low with values in the range of −100 to −120 mGal (−1000 to −1200 μm/s 2 ) was observed, and two-dimensional crustal models were created to identify the cause of the anomaly. The gravity anomaly cannot be attributed wholly to the bathymetry of the strait or to the sedimentary rocks underlying the strait. Crustal models that reproduce the anomaly have a M discontinuity that slopes under Nares Strait towards Ellesmere Island so that the crust beneath Ellesmere Island is thickened. The anomaly is similar to those associated with ancient and modern suture zones, regions of collided continental crust. Plate reconstructions suggest Nares Strait is a collisional boundary between the North American Plate (Ellesmere Island) and the Greenland Plate. The gravity anomaly supports this interpretation of Nares Strait. Article in Journal/Newspaper Ellesmere Island Greenland Nares strait Canadian Science Publishing Canadian Journal of Earth Sciences 22 9 1322 1328 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
A negative free-air gravity anomaly is associated with Nares Strait, the waterway that separates Ellesmere Island and Greenland. Two east–west gravity profiles that cross Ellesmere Island and Nares Strait were collected. A low with values in the range of −100 to −120 mGal (−1000 to −1200 μm/s 2 ) was observed, and two-dimensional crustal models were created to identify the cause of the anomaly. The gravity anomaly cannot be attributed wholly to the bathymetry of the strait or to the sedimentary rocks underlying the strait. Crustal models that reproduce the anomaly have a M discontinuity that slopes under Nares Strait towards Ellesmere Island so that the crust beneath Ellesmere Island is thickened. The anomaly is similar to those associated with ancient and modern suture zones, regions of collided continental crust. Plate reconstructions suggest Nares Strait is a collisional boundary between the North American Plate (Ellesmere Island) and the Greenland Plate. The gravity anomaly supports this interpretation of Nares Strait. |
format |
Article in Journal/Newspaper |
author |
Jackson, H. R. Koppen, L. |
spellingShingle |
Jackson, H. R. Koppen, L. The Nares Strait gravity anomaly and its implications for crustal structure |
author_facet |
Jackson, H. R. Koppen, L. |
author_sort |
Jackson, H. R. |
title |
The Nares Strait gravity anomaly and its implications for crustal structure |
title_short |
The Nares Strait gravity anomaly and its implications for crustal structure |
title_full |
The Nares Strait gravity anomaly and its implications for crustal structure |
title_fullStr |
The Nares Strait gravity anomaly and its implications for crustal structure |
title_full_unstemmed |
The Nares Strait gravity anomaly and its implications for crustal structure |
title_sort |
nares strait gravity anomaly and its implications for crustal structure |
publisher |
Canadian Science Publishing |
publishDate |
1985 |
url |
http://dx.doi.org/10.1139/e85-136 http://www.nrcresearchpress.com/doi/pdf/10.1139/e85-136 |
genre |
Ellesmere Island Greenland Nares strait |
genre_facet |
Ellesmere Island Greenland Nares strait |
op_source |
Canadian Journal of Earth Sciences volume 22, issue 9, page 1322-1328 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e85-136 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
22 |
container_issue |
9 |
container_start_page |
1322 |
op_container_end_page |
1328 |
_version_ |
1810442359066853376 |