| Abstract: | Zoned spinel of unusual composition and morphology has been found in massive pyrrhotite-chalcopyrite-pent-landite ore from the La Perouse layered gabbro intrusion in the Fairweather Range, southeastern Alaska. The spinel grains show continuous zoning from cores with up to 53 wt.% Cr2O3 to rims with less than 11 wt.% Cr2O3. Their composition is exceptional because they contain less than 0.32 wt.% MgO and less than 0.10 wt.% Al2O3 and TiO2. Also notable are the concentrations of MnO and V2O3, which reach 4.73 and 4.50 wt.%, respectively, in the cores. The spinel is thought to have crystallized at low oxygen fugacity and at temperatures above 900??C, directly from a sulfide melt that separated by immiscibility from the gabbroic parental magma. ?? 1976. |
| Genre: | Article |
| ProdID: | 70010374 |
| Citation Author: | Czamanske, G. K.; Himmelberg, G. R.; Goff, F. E. |
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| Citation End Page: | 118 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Earth and Planetary Science Letters |
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| Citation Number Of Pages: | 8 |
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| Citation Search Results Text: | Zoned Cr, Fe-spinel from the La Perouse layered gabbro, Fairweather Range, Alaska; 1976; Article; Journal; Earth and Planetary Science Letters; Czamanske, G. K.; Himmelberg, G. R.; Goff, F. E. |
| Citation Start Page: | 111 |
| Citation Volume: | 33 |
| Citation Year: | 1976 |
| Type: | citation/reference |
| Text: | Zoned Cr, Fe-spinel from the La Perouse layered gabbro, Fairweather Range, Alaska; 1976; Article; Journal; Earth and Planetary Science Letters; Czamanske, G. K.; Himmelberg, G. R.; Goff, F. E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1976 00:00 -0600 |
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