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Satellite magnetic anomalies over subduction zones - The Aleutian Arc anomalyPositive magnetic anomalies seen in MAGSAT average scalar anomaly data overlying some subduction zones can be explained in terms of the magnetization contrast between the cold subducted oceanic slab and the surrounding hotter, nonmagnetic mantle. Three-dimensional modeling studies show that peak anomaly amplitude and location depend on slab length and dip. A model for the Aleutian Arc anomaly matches the general trend of the observed MAGSAT anomaly if a slab thickness of 7 km and a relatively high (induced plus viscous) magnetization contrast of 4 A/m are used. A second source body along the present day continental margin is required to match the observed anomaly in detail, and may be modeled as a relic slab from subduction prior to 60 m.y. ago.
Document ID
19850038956
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Clark, S. C.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Frey, H.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Thomas, H. H.
(NASA Goddard Space Flight Center Geophysics Branch, Greenbelt, MD, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Publication Information
Publication: Geophysical Research Letters
Volume: 12
ISSN: 0094-8276
Subject Category
Earth Resources And Remote Sensing
Accession Number
85A21107
Distribution Limits
Public
Copyright
Other

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