Crustal structure of the Churchill-Superior boundary zone between 80 and 98 deg W longitude from Magsat anomaly maps and stacked passes
A modeling technique using spherical shell elements and equivalent dipole sources has been applied to Magsat signatures at the Churchill-Superior boundary in Manitoba, Ontario, and Ungava. A large satellite magnetic anomaly (12 nT amplitude) on POGO and Magsat maps near the Churchill-Superior bounda...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19850044270 2023-05-15T15:55:03+02:00 Crustal structure of the Churchill-Superior boundary zone between 80 and 98 deg W longitude from Magsat anomaly maps and stacked passes Hall, D. H. Millar, T. W. Noble, I. A. Unclassified, Unlimited, Publicly available Feb 28, 1985 http://ntrs.nasa.gov/search.jsp?R=19850044270 unknown http://ntrs.nasa.gov/search.jsp?R=19850044270 Accession ID: 85A26421 Copyright Other Sources 46 Journal of Geophysical Research; 90; 2621-263 1985 ftnasantrs 2012-02-15T16:19:34Z A modeling technique using spherical shell elements and equivalent dipole sources has been applied to Magsat signatures at the Churchill-Superior boundary in Manitoba, Ontario, and Ungava. A large satellite magnetic anomaly (12 nT amplitude) on POGO and Magsat maps near the Churchill-Superior boundary was found to be related to the Richmond Gulf aulacogen. The averaged crustal magnetization in the source region is 5.2 A/m. Stacking of the magnetic traces from Magsat passes reveals a magnetic signature (10 nT amplitude) at the Churchill-Superior boundary in an area studied between 80 deg W and 98 deg W. Modeling suggests a steplike thickening of the crust on the Churchill side of the boundary in a layer with a magnetization of 5 A/m. Signatures on aeromagnetic maps are also found in the source areas for both of these satellite anomalies. Other/Unknown Material Churchill NASA Technical Reports Server (NTRS) |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
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unknown |
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46 |
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46 Hall, D. H. Millar, T. W. Noble, I. A. Crustal structure of the Churchill-Superior boundary zone between 80 and 98 deg W longitude from Magsat anomaly maps and stacked passes |
topic_facet |
46 |
description |
A modeling technique using spherical shell elements and equivalent dipole sources has been applied to Magsat signatures at the Churchill-Superior boundary in Manitoba, Ontario, and Ungava. A large satellite magnetic anomaly (12 nT amplitude) on POGO and Magsat maps near the Churchill-Superior boundary was found to be related to the Richmond Gulf aulacogen. The averaged crustal magnetization in the source region is 5.2 A/m. Stacking of the magnetic traces from Magsat passes reveals a magnetic signature (10 nT amplitude) at the Churchill-Superior boundary in an area studied between 80 deg W and 98 deg W. Modeling suggests a steplike thickening of the crust on the Churchill side of the boundary in a layer with a magnetization of 5 A/m. Signatures on aeromagnetic maps are also found in the source areas for both of these satellite anomalies. |
format |
Other/Unknown Material |
author |
Hall, D. H. Millar, T. W. Noble, I. A. |
author_facet |
Hall, D. H. Millar, T. W. Noble, I. A. |
author_sort |
Hall, D. H. |
title |
Crustal structure of the Churchill-Superior boundary zone between 80 and 98 deg W longitude from Magsat anomaly maps and stacked passes |
title_short |
Crustal structure of the Churchill-Superior boundary zone between 80 and 98 deg W longitude from Magsat anomaly maps and stacked passes |
title_full |
Crustal structure of the Churchill-Superior boundary zone between 80 and 98 deg W longitude from Magsat anomaly maps and stacked passes |
title_fullStr |
Crustal structure of the Churchill-Superior boundary zone between 80 and 98 deg W longitude from Magsat anomaly maps and stacked passes |
title_full_unstemmed |
Crustal structure of the Churchill-Superior boundary zone between 80 and 98 deg W longitude from Magsat anomaly maps and stacked passes |
title_sort |
crustal structure of the churchill-superior boundary zone between 80 and 98 deg w longitude from magsat anomaly maps and stacked passes |
publishDate |
1985 |
url |
http://ntrs.nasa.gov/search.jsp?R=19850044270 |
op_coverage |
Unclassified, Unlimited, Publicly available |
genre |
Churchill |
genre_facet |
Churchill |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19850044270 Accession ID: 85A26421 |
op_rights |
Copyright |
_version_ |
1766390389207465984 |