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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Bibliographic Details
Main Authors: Hall, D. H., Millar, T. W., Noble, I. A.
Format: Other/Unknown Material
Language:unknown
Published: 1985
Subjects:
46
Churchill
Online Access:http://ntrs.nasa.gov/search.jsp?R=19850044270
id ftnasantrs:oai:casi.ntrs.nasa.gov:19850044270
record_format openpolar
spelling 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)
institution Open Polar
collection NASA Technical Reports Server (NTRS)
op_collection_id ftnasantrs
language unknown
topic 46
spellingShingle 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

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