Petrology of Intrusive Masses of Kuh-e-Siah and Kuh-e-Anarbone (NW of kashan)

Category Petrology
Group GSI.IR
Location 21th symposium on geosciences
Holding Date 21 May 2008

      The outcrops of intrusive rocks of kuh-e-Anarboneh and kuh-e-siah are located between 34? 15?to 34? 25? N and 51? 00 to 51? 05? E on northwest of Kashan. They are intruded among Eocene tuff and volcanic. Rocks of this area which are part of Uroomieh ? Dokhtar Zone, contain collection of granitoid, aplitic dikes and pegmatite. Their overall texture is granular and porphyroid but pertitic?antipertitic, granophyric, micro-graphic and mirmekitic textures could also be seen.
   According to field investigation, lithologic characteristics, behavior of rare and main elements oxides, spider diagrams and geochemical specification, the intrusive rocks of the area belongs to calc-alkaline series and are from subduction zone of continental shelf. This magma is the result of subduction of Neo?Tethis ocean crust and collision of Arabian plate with central Iran which produced volcanic arc. The collision of Arabian plate with central Iran has happened in Upper Cretaceous and granitoid formation probably coincides with Pyrenean orogenic.