Genesis of ultramafic rocks of the Alkhadyr terrane (East Sayan,Siberia): implications from the data on Cr-spinel compositions |
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| Affiliation: | 1. A.P. Vinogradov Institute of Geochemistry, Siberian Branch, Russian Academy of Science, ul. Favorskogo 1a, Irkutsk, 664033, Russia;2. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;3. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;4. Irkutsk State Technical University, ul. Lermontova 83, Irkutsk, 664074, Russia |
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| Abstract: | This paper presents the first geochemical data on Cr-spinels from ultramafic rocks of the Alkhadyr terrane, which were obtained on a representative collection of samples using modern research methods. The compositional data on melt inclusions allowed the identification of three generations of Cr-spinels on the basis of their morphology, composition, and relationships with the rock-forming minerals. Different types of geochemical zoning were recognized in heterogeneous Cr-spinel grains. The composition of parental melt and crystallization temperatures of the minerals in ultramafic rocks were derived from the compositional data on Cr-spinels and trapped melt inclusions. |
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