Josephinite: Crystal structures and phase relations of the metals

Details Josephinite: Crystal structures and phase relations of the metals Josephinite: Crystal structures and phase relations of the metals

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pepi...23..255b&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 23, Issue 4, p. 255-261.

Physics

1

Scientific paper

Josephinite, a complex, metal-bearing rock from the region of the Josephine Peridotite in southwest Oregon, contains FeNiCo metal alloy phases having exsolution textures. Scanning and transmission electron microscopy have revealed Widmanstaetten patterns in which the lamellae are polysynthetically twinned, ordered, face-centered-cubic FeNi3 surrounded by untwinned, ordered, face-centered-cubic FeNi3 and body-centered-cubic FeCo. These exsolution textures require a temperature in excess of 500°C for their formation. This is consistent with a mantle derivation of josephinite prior to obduction of the peridotite in one of the Klamath ophiolites.

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