Genesis of hydrothermal alterations using stable isotope geochemistry in Takestan area (Tarom zone)

زمین شناسی اقتصادی

Article 5, Volume 1, Issue 1, January 2010, Pages 101-115   

Document Type: Research Article

DOI: 10.22067/econg.v1i1.3683

Authors

Batoul Taghipour^{* 1}; Mohammad Ali Mackizadeh²

¹Shiraz

²Isfahan

Abstract

Hydrothermal alteration processes are extensively took place on volcanic and pyroclstics of Takestan area. Existence of abundant, deep fracturing and subvolcanic intrusions are enhanced extend hydrothermal alteration zones. The following alteration zones are determined: propylitic, argillic, advanced argillic and sillicic. There are outcropped and widespread in different size and limit. Formation of siliceous sinter, silicified tuffs with preserved primary sedimentary layering including pure mineralized alunite patches are most outstanding. Quartz, sussoritic plagioclase, chlorite, sericite and alunite are main mineral constituents in the volcanics. On the basis of geochemical data volcanic rocks are rhyolite, dacite, andesite, andesitic-basalt and basalt in composition. Acid-sulfate zone is the type of alteration in Tarom area and alunite is an index mineral of this zone. Results of 18O, D and 34S stable isotope geochemistry on altered minerals (muscovite, kaolinite and alunite), revealed that alteration fluids are magmatic in origin.

Keywords

Tarom zone; hydrothermal alteration; stable isotope; eocene tuff