Crustal magnetization and temperature at depth beneath the Yilgarn block, Western Australia inferred from Magsat data

Details Crustal magnetization and temperature at depth beneath the Yilgarn block, Western Australia inferred from Magsat data Crustal magnetization and temperature at depth beneath the Yilgarn block, Western Australia inferred from Magsat data

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.107..515m&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 107, no. 3-4, Dec. 1991, p. 515-522. Research supported by Australian

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6

Earth Crust, Magnetization, Magsat Satellites, Temperature Effects, Australia, Earth Mantle, Isotherms, Precambrian Period, Structural Properties (Geology)

Scientific paper

Variations in crustal magnetization along a seismic section across the Archean Yilgarn block of Western Australia inferred from Magsat data are interpreted as a subtle thermal effect arising from variations in depth to the Curie isotherm. The isotherm lies deep within the mantle of the eastern part of the province, but transects the crust-mantle transition and rises well into the crust on the western side. The model is consistent with heat flow variations along the section line. The mean crustal magnetization implied by the model is approximately 2 A/m. The temperature variation implied by the model is consistent with the hypothesis that the crust-mantle transition seen seismically corresponds to the mafic granulite-eclogite phase transition within a zone of igneous crustal underplating.

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