Zoned Cr, Fe-spinel from the La Perouse layered gabbro, Fairweather Range, Alaska
Earth and Planetary Science Letters
By: G.K. Czamanske, G. R. Himmelberg, and F.E. Goff
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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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Zoned Cr, Fe-spinel from the La Perouse layered gabbro, Fairweather Range, Alaska |
| Series title | Earth and Planetary Science Letters |
| DOI | 10.1016/0012-821X(76)90163-1 |
| Volume | 33 |
| Issue | 1 |
| Year Published | 1976 |
| Language | English |
| Publisher | Elsevier |
| Description | 8 p. |
| First page | 111 |
| Last page | 118 |
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