Vol. 3,No. 7, July 2013

Author(s): Amin Panahi,Mohsen balvasi

Abstract: The Tas hall copper index is located in 15 Km of south of Azna, Lorestan, Iran, and is regarded as a small portion of Sanandaj – Sirjan Zone (SSZ). The studied region is affected by important orogenic phases of Cimmerian and final cretaceous and several intrusive masses like Azna are injected in it. These masses have penetrated into shales and Jurassic sandstone. The igneous rocks are mainly ranging from granodiorite to andesite volcanic. The petrology studies show that volcanic rocks of the region are porphyry andesite. In terms of mineralization : chalcopyrite, chalcosite, burnit, malachite, azurite, magnetite and limonite minerals are the most important minerals that occurring as veinlets. In terms of alteration, sericitiazation, chloritization, and epidotization are dominated alterations of the region. With regard to development of alteration zones in volcanic rocks and vein mineralization in these rocks it seems that these rocks are the main host rock of mineralization in the region and mineralize factor must be related to probably granodiritic intrusive. Based on geotectonic data these rocks are related to arcs after collision volcanic. The under studied region’s rocks are normalized based on primitive mantle and ORG values. All cases almost show chemical-charactiritics and similar neicheru mantle metasomatism ore continental crust impregnation.

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