Zoned Cr, Fe-spinel from the La Perouse layered gabbro, Fairweather Range, Alaska

Details Zoned Cr, Fe-spinel from the La Perouse layered gabbro, Fairweather Range, Alaska Zoned Cr, Fe-spinel from the La Perouse layered gabbro, Fairweather Range, Alaska

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..33..111c&link_type=abstract

Earth and Planetary Science Letters, Volume 33, Issue 1, p. 111-118.

Computer Science

6

Scientific paper

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.

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