Diagenesis and Tectonic Setting of the Varcheh Intrusive Masses in Sanandaj-Sirjan Zone, Iran
Keywords:
Basic intrusive rocks, Tectonic environment, Varech, Samandaj-Sirjan zoneAbstract
Varcheh intrusive masses of the Sanandaj-Sirjan zone (SSZ) are embedded in middle and upper cretaceous sedimentary rocks. The lithological composition of this complex is mostly olivine gabbro, monzogabbro, diorite, and monzodiorite with granular and ophitic textures. The clinopyroxene, plagioclase, and sometimes indigenized olivine are the major crystals of these rocks. Enrichment in LILE (i.e., Ba, Rb, and Th) and depletion in HFSEs (Ti and Nb) from spider diagrams show the characteristics of rift environment-associated rocks. The geochemical and petrogenetic studies indicate the common origin of the intrusive rocks in the region and the role of differential crystallization along with the contamination of magma with crustal rocks in the evolution of the source magma of the mentioned rocks. This magma has originated from the low-grade partial melting of an enriched garnet-spinel-lherzolite mantle source at a depth of 100 to 110 km. In general, small exposures from a large batholith are observed on the ground.
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