Ultra-high Pressure Minerals in Ophiolites

Details Ultra-high Pressure Minerals in Ophiolites Ultra-high Pressure Minerals in Ophiolites

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.v14a..08r&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #V14A-08

Other

3660 Metamorphic Petrology, 3665 Mineral Occurrences And Deposits

Scientific paper

Most ultra-high pressure (UHP) minerals are found in kimberlites, deeply subducted continental crustal rocks and meteorites or meteorite impact craters. Graphitized diamonds have been found in subcontinental peridotites of the Ronda and Beni Boursera massifs. Numerous UHP minerals have also been reported from ophiolites, particularly in Russia, Indonesia, Canada, the USA and China. Many of these reported discoveries are from placer deposits and the origin of the UHP minerals has not been confirmed. The best documented occurrence of an UHP mineral-bearing ophiolite is the Luobusa ophiolite, which lies in the Yarlung-Zangbo suture zone of southern Tibet. A wide variety of UHP minerals, including diamond, moissanite, coesite, Fe-silicides, wüstite, silicon rutile, silicon spinel, and CrC alloys, has been recovered from podiform chromitites in Luobusa. These minerals are associated with native elements, such as Si, Fe, Ti, and Cr, and with PGE alloys, some of which may also have an UHP origin. Diamonds have also been reported from the Donqiao ophiolite of the Nujiang-Bangong Lake suture zone in central Tibet but this occurrence as not been confirmed. The demonstrated occurrence of UHP minerals in Luobusa and the reported occurrences from other bodies suggest that ophiolites may be common repositories of UHP minerals.

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