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crustal structure of the churchill-superior boundary zone between 80 and 98 deg w longitude from magsat anomaly maps and stacked passesA 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.
Document ID
19850044270
Document Type
Reprint (Version printed in journal)
Authors
Hall, D. H.
(Manitoba Univ. Winnipeg, Manitoba, Canada)
Millar, T. W.
(Manitoba, University Winnipeg, Canada)
Noble, I. A.
(Texaco Canada Resources, Ltd. Calgary, Alberta, Canada)
Date Acquired
August 12, 2013
Publication Date
February 28, 1985
Publication Information
Publication: Journal of Geophysical Research
Volume: 90
ISSN: 0148-0227
Subject Category
GEOPHYSICS
Distribution Limits
Public
Copyright
Other