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Magsat and POGO magnetic anomalies over the Lord Howe Rise Evidence against a simple continental crustal structureMagsat average scalar and POGO reduced-to-pole magnetic anomaly data both show prominent positive signatures over the Lord Howe Rise. Although generally assumed to be continental in nature, the Lord Howe Rise cannot simply be submerged ordinary continental crust, which would produce a negative anomaly contrast with respect to the surrounding higher susceptibility oceanic crust. Three-dimensional modeling of the plateau, using the known crustal structure and assuming an induced origin for the satellite elevation anomaly, leads to a model in which the lowest crustal layer in an otherwise 'continental' crustal structure has an unusually high susceptibility in the range cgs 0.008-0.010 (SI 0.10-0.13). Replacement or alteration of the lowest layer by a high-susceptibility rock type may be related to the subsidence of the plateau.
Document ID
19850044271
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Frey, H.
(NASA Goddard Space Flight Center Geophysics Branch, Greenbelt, MD, United States)
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
Accession Number
85A26422
Distribution Limits
Public
Copyright
Other

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