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An equivalent layer magnetization model for Australia based on Magsat dataAn equivalent layer magnetization model for Australia and adjacent oceanic areas is presented. The model is obtained by linear inversion of Magsat anomaly data measured in the altitude range 325-550 km. The anomaly data set has been isolated from the raw data set by use of models of the core field and very long wavelength external fields, and is internally consistent. Certain major structural features of the Australian continent are geographically associated with magnetization anomalies. A first-order difference is seen between the Tasman Zone and the Precambrian cratonic areas: magnetization anomalies are much more subdued in the former, possibly reflecting a shallowing of the Curie isotherm within the crust. A profile of the vertical integral of magnetization is presented for a crustal section extending from the Gawler Block to the southeast coast. It is shown that the magnetization variations are probably due partly, but not wholly, to depth to Curie isotherm variations; gross magnetization variations among at least three distinct crustal units must be involved.
Document ID
19870060016
Document Type
Reprint (Version printed in journal)
Authors
Mayhew, M. A. (NSF Washington, DC, United States)
Johnson, B. D. (Macquarie University North Ryde, Australia)
Date Acquired
August 13, 2013
Publication Date
May 1, 1987
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 83
Issue: 1-4,
ISSN: 0012-821X
Subject Category
GEOPHYSICS
Distribution Limits
Public
Copyright
Other