ISSN:
1432-1866
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Geologie und Paläontologie
Notizen:
Abstract In the ophiolite series of N. Oman numerous small and large elongated podiform chromite deposits occur within the peridotite complex at a certain level of 100–200 meters below the layered zone, which grades into the overlying gabbro complex. The chromite grains were corroded after their deposition; their composition shows a large variation in Cr/Al ratio and a small variation in Cr/Fe ratio. The chromium is thought to have been liberated from clino-pyroxenes during partial melting of lherzolitic upper mantle material. Precipitation of large quantities of chromite at the specific level below the gabbro complex is related to the plagioclase- /spinel-lherzolite transition, but the influence of a change in oxygen fugacity is also considered.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00203999
