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Journal of Applied Sciences
Year: 2008  |  Volume: 8  |  Issue: 23  |  Page No.: 4251 - 4262

Petrography and Geochemistry Characteristic of Enclaves in the Astaneh Pluton (Sanandaj-Sirjan Zone, Western Iran)

Z. Tahmasbi, M. Khalili, A. Castro and A. Ahmadi    

Abstract: Microgabbrodiorite, microdiorite and less than microgranodiorite enclaves occur in the Astaneh pluton. These enclaves have I-type mineral assemblages that are broadly similar to those in the host granitoids except for the greater abundance of mafic minerals, such as amphibole. They show various features formed by magma mixing/mingling environment: abundant subrounded shape, sharp but partly diffuse contact with host granitoids, finer grain size than host granites, more mafic small enclave in large enclave, ocellar quartz, acicular apatite, poikilitic textures and pargasitic amphibole in dacitic enclave. Indeed geochemistry evidences and enclaves normalized against their host granodiorites show that magma mingling occurred.

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