作者： KHALID MAHMOOD , HAZEL PRICHARD , CJ MACLEOD , MEHRAB KHAN BALOCH , PETER FISHER
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摘要: ABSTRACT Ru-Os-Ir-bearing minerals have been located in chromites in the Muslim Bagh ophiolite complex. The most common mineral is laurite (Ru, Os, Ir) S2. An irasite was located as part of a composite with laurite. One mottled Ru-oxide was identified in silicate interstitial to the chromite grains. This paper documents, for the first time, the presence of discrete platinum-group minerals (PGM) in the Muslim Bagh ophiolite, following the report of occurrence of Ir and Os in 1996 by Nakagawa et al. Fifteen chromite-rich samples were studied using an SEM to locate and analyse the PGM. The samples came from both the Jang Tor Ghar and Saplai Tor Ghar blocks of the ophiolite. PGM have been found in both sample sets. PGM enclosed in chromite grains are often euhedral and sometimes associated with silicate inclusions in chromites. PGM in contact with interstitial silicates are often subhedral or rounded and may be mottled and composite indicating that they have been affected by alteration.