Ahmadnejad
Subject Areas :
Esmaiel Darvishi
1
(
استادیار گروه زمین شناسی، دانشگاه آزاد اسلامی، واحد الیگودرز
)
Keywords: Sanandaj- Sirjan, Granitoid, Metamorphic Zone, Neotethys,
Abstract :
The Dehno granite massive is located in the East Dehno village and southern Khomein city and within themetamorphic Sanandaj–sirjan Zone. The composition of these rocks include: granodiorite, quartzdiorite(tonalite), monzogranite and leucogranite. Quartz, alkali feldspar, plagioclase, biotite, andalusite, hornblendemuscovite, tourmaline, zircon and apatite are examples of the existing major and minor minerals in theseintrusive rocks. This body is host the tourmaline bearing silica veins and dykes and mafic enclave microgranolaraplitic (several) and doleritic (seldom). Mineralogy and geochemical studies this rocks indicated mantlePeraluminium and calc alkaline and mixing origin(melting of the oceanic crust of the Neo-Tethyan belowCentral Iranian Microplate) and anatexi melting (the melting of continental crust sediments) and rocksenrichment LILE elements such as granite(Rb, K, Cs) and the concentration of depleted elements, particularlyHFSE Ti, Nb and P is consistent with the pattern of granites associated with the subduction setting and from thetectonic environment aspect, they are considered as the volcanic arc granitoids (VAG).
