A preliminary study of komatiites in Anshan-Benxi-Fushun region,Northeast China |
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| Authors: | Guangrong Xu Hongjiang Chen |
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| Institution: | 1. Changchun Geological School, Ministry of Metallurgical Industry, China
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| Abstract: | Discovered for the first time in the Lower Anshan Group with a metamorphic grade from amphibolite to granulite facies, komatiites occur as bedded ultramafic volcanic rocks on the ocean-floor. The komatiites in the Anshan-Benxi-Fushun region occurring in the metamorphic rocks are some monomineralic rocks such as hornblendite, clinopyroxene and hypersthenite. Local komatiites are found retaining some typical pre-existing structures and textures of volcanic rocks, such as blastovariolitic and blastodoleritic textures. The chemical composition of komatiites in this region is much similar to that of other well-known model komatiites in the world, and so are their geochemical characteristics. The occurrence of komatiites in the Anshan-Benxi-Fushun region provides strong evidence showing that this region is an Archean greenstone belt. Studies on komatiites in this region will shed much light on the stratigraphic division of the Anshan Group and the paleo-structure of the greenstone belt as well as on the rules governing metallogenesis in the Anshan-Benxi-Fushun region. |
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