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Detailed Reference Information |
Toft, P.B. and Haggerty, S.E. (1988). Limiting depth of magnetization in cratonic lithosphere. Geophysical Research Letters 15. doi: 10.1029/88GL02123. issn: 0094-8276. |
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Values of magnetic susceptibility and natural remanent magnetization (NRM) of clinopyroxene-garnet-plagioclase granulite facies lower crustal xenoliths from a kimberlite in west Africa are correlated to bulk geochemistry and specific gravity. Thermomagnetic and AF demagnetization analyses identify magnetite (Mt) and native iron (Fe) as the dominant magnetic phases (totalling ≤0.1 vol. % of the rocks) along with subsidiary sulfides. Oxidation states of the granulites are ≤MW, observed Mt occurs as rims on coarse (~1 &mgr;m) Fe particles, and inferred SD-PSD 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 modelling Magsat anomalies over exposed Precambrian shields. ¿ American Geophysical Union 1988 |
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Abstract |
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Keywords
Geomagnetism and Paleomagnetism, Rock and mineral magnetism, Geochemistry, Composition of the crust, Mineral Physics, High-pressure behavior, Geomagnetism and Paleomagnetism, Spatial variations (all harmonics and anomalies) |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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