Josephinite: Crystal structures and phase relations of the metals |
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| Authors: | William A. Bassett John M. Bird Maura S. Weathers D.L. Kohlstedt |
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| Affiliation: | 1. Department of Geological Sciences, Cornell University, Ithaca, NY 14853 U.S.A.;2. Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853 U.S.A. |
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| Abstract: | 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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