Native iron in the continental lower crust - Petrological and geophysical implications

Details Native iron in the continental lower crust - Petrological and geophysical implications Native iron in the continental lower crust - Petrological and geophysical implications

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985sci...229..647h&link_type=abstract

Science (ISSN 0036-8075), vol. 229, Aug. 16, 1985, p. 647-649. Research supported by the Weasua Mining and Development Corp.

Other

17

Continents, Earth Crust, Geomagnetism, Iron, Petrology, Ferromagnetism, Liberia, Magnetic Anomalies, Oxidation, Remanence

Scientific paper

Lower crustal granulite xenoliths recovered from a kimberlite pipe in western Africa contain native iron (Fe) as a decomposition product of garnet and ilmenite. Magnetic measurements show that less than 0.1 percent (by volume) of iron metal is present. Data from geothermometry and oxygen geobarometry indicate that the oxide and metal phases equilibrated between iron-wuestite and magnetite-wuestite buffers, which may represent the oxidation state of the continental lower crust, and the depleted lithospheric upper mantle. Ferromagnetic native iron could be stable to a depth of about 95 kilometers and should be considered in the interpretation of long-wavelength static magnetic anomalies.

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