Limiting depth of magnetization in cratonic lithosphere

Details Limiting depth of magnetization in cratonic lithosphere Limiting depth of magnetization in cratonic lithosphere

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..530t&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, May 1988, p. 530-533. Research supported by the Weasua Mining and Develo

Physics

17

Cratons, Lithosphere, Magnetic Permeability, Magnetization, Minerals, Remanence, Earth Crust, Earth Mantle, Geochemistry, Petrology

Scientific paper

Values of magnetic susceptibility and natural remanent magnetization (NRM) of clino-pyroxene-garnet-plagioclase granulite facies lower crustal xenoliths from a kimberlite in west Africa are correlated to bulk geochemistry and specific gravity. Thermomagnetic and alternating-field demagnetization analyses identify magnetite (Mt) and native iron as the dominant magnetic phases (totaling not more than 0.1 vol pct of the rocks) along with subsidiary sulfides. Oxidation states of the granulites are not greater than MW, observed Mt occurs as rims on coarse (about 1 micron) Fe particles, and inferred single domain-pseudosingle domain Mt may be a result of oxidation of fine-grained Fe. The deepest limit of lithospheric ferromagnetism is 95 km, but a limit of 70 km is most reasonable for the West African Craton and for modeling Magsat anomalies over exposed Precambrian shields.

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