The gravity field over the Ungava Bay region from satellite altimetry and new land-based data: implications for the geology of the area
Gravity data were obtained along two transects on the southern coast of Ungava Bay, which provide continuous gravity coverage between Leaf Bay and George River. The transects and the derived gravity profiles extend from the Superior craton to the Rae Province across the New Quebec Orogen (NQO). Inte...
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crcansciencepubl:10.1139/e98-085 2024-09-30T14:38:10+00:00 The gravity field over the Ungava Bay region from satellite altimetry and new land-based data: implications for the geology of the area Telmat, Hamid Mareschal, Jean-Claude Gariépy, Clément 1999 http://dx.doi.org/10.1139/e98-085 http://www.nrcresearchpress.com/doi/pdf/10.1139/e98-085 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 36, issue 1, page 75-89 ISSN 0008-4077 1480-3313 journal-article 1999 crcansciencepubl https://doi.org/10.1139/e98-085 2024-09-05T04:11:16Z Gravity data were obtained along two transects on the southern coast of Ungava Bay, which provide continuous gravity coverage between Leaf Bay and George River. The transects and the derived gravity profiles extend from the Superior craton to the Rae Province across the New Quebec Orogen (NQO). Interpretation of the transect along the southwestern coast of Ungava Bay suggests crustal thickening beneath the NQO and crustal thinning beneath the Kuujjuaq Terrane, east of the NQO. Two alternative interpretations are proposed for the transect along the southeastern coast of the bay. The first model shows crustal thickening beneath the George River Shear Zone (GRSZ) and two shallow bodies correlated with the northern extensions of the GRSZ and the De Pas batholith. The second model shows constant crustal thickness and bodies more deeply rooted than in the first model. The gravity models are consistent with the easterly dipping reflections imaged along a Lithoprobe seismic line crossing Ungava Bay and suggest westward thrusting of the Rae Province over the NQO. Because no gravity data have been collected in Ungava Bay, satellite altimetry data have been used as a means to fill the gap in data collected at sea. The satellite-derived gravity data and standard Bouguer gravity data were combined in a composite map for the Ungava Bay region. The new land-based gravity measurements were used to verify and calibrate the satellite data and to ensure that offshore gravity anomalies merge with those determined by the land surveys in a reasonable fashion. Three parallel east-west gravity profiles were extracted: across Ungava Bay (59.9°N), on the southern shore of the bay (58.5°N), and onshore ~200 km south of Ungava Bay (57.1°N). The gravity signature of some major structures, such as the GRSZ, can be identified on each profile. Article in Journal/Newspaper Kuujjuaq Ungava Bay Canadian Science Publishing Ungava Bay ENVELOPE(-67.489,-67.489,59.498,59.498) Kuujjuaq ENVELOPE(-68.398,-68.398,58.100,58.100) Canadian Journal of Earth Sciences 36 1 75 89 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Gravity data were obtained along two transects on the southern coast of Ungava Bay, which provide continuous gravity coverage between Leaf Bay and George River. The transects and the derived gravity profiles extend from the Superior craton to the Rae Province across the New Quebec Orogen (NQO). Interpretation of the transect along the southwestern coast of Ungava Bay suggests crustal thickening beneath the NQO and crustal thinning beneath the Kuujjuaq Terrane, east of the NQO. Two alternative interpretations are proposed for the transect along the southeastern coast of the bay. The first model shows crustal thickening beneath the George River Shear Zone (GRSZ) and two shallow bodies correlated with the northern extensions of the GRSZ and the De Pas batholith. The second model shows constant crustal thickness and bodies more deeply rooted than in the first model. The gravity models are consistent with the easterly dipping reflections imaged along a Lithoprobe seismic line crossing Ungava Bay and suggest westward thrusting of the Rae Province over the NQO. Because no gravity data have been collected in Ungava Bay, satellite altimetry data have been used as a means to fill the gap in data collected at sea. The satellite-derived gravity data and standard Bouguer gravity data were combined in a composite map for the Ungava Bay region. The new land-based gravity measurements were used to verify and calibrate the satellite data and to ensure that offshore gravity anomalies merge with those determined by the land surveys in a reasonable fashion. Three parallel east-west gravity profiles were extracted: across Ungava Bay (59.9°N), on the southern shore of the bay (58.5°N), and onshore ~200 km south of Ungava Bay (57.1°N). The gravity signature of some major structures, such as the GRSZ, can be identified on each profile. |
format |
Article in Journal/Newspaper |
author |
Telmat, Hamid Mareschal, Jean-Claude Gariépy, Clément |
spellingShingle |
Telmat, Hamid Mareschal, Jean-Claude Gariépy, Clément The gravity field over the Ungava Bay region from satellite altimetry and new land-based data: implications for the geology of the area |
author_facet |
Telmat, Hamid Mareschal, Jean-Claude Gariépy, Clément |
author_sort |
Telmat, Hamid |
title |
The gravity field over the Ungava Bay region from satellite altimetry and new land-based data: implications for the geology of the area |
title_short |
The gravity field over the Ungava Bay region from satellite altimetry and new land-based data: implications for the geology of the area |
title_full |
The gravity field over the Ungava Bay region from satellite altimetry and new land-based data: implications for the geology of the area |
title_fullStr |
The gravity field over the Ungava Bay region from satellite altimetry and new land-based data: implications for the geology of the area |
title_full_unstemmed |
The gravity field over the Ungava Bay region from satellite altimetry and new land-based data: implications for the geology of the area |
title_sort |
gravity field over the ungava bay region from satellite altimetry and new land-based data: implications for the geology of the area |
publisher |
Canadian Science Publishing |
publishDate |
1999 |
url |
http://dx.doi.org/10.1139/e98-085 http://www.nrcresearchpress.com/doi/pdf/10.1139/e98-085 |
long_lat |
ENVELOPE(-67.489,-67.489,59.498,59.498) ENVELOPE(-68.398,-68.398,58.100,58.100) |
geographic |
Ungava Bay Kuujjuaq |
geographic_facet |
Ungava Bay Kuujjuaq |
genre |
Kuujjuaq Ungava Bay |
genre_facet |
Kuujjuaq Ungava Bay |
op_source |
Canadian Journal of Earth Sciences volume 36, issue 1, page 75-89 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e98-085 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
36 |
container_issue |
1 |
container_start_page |
75 |
op_container_end_page |
89 |
_version_ |
1811640881436950528 |