Geology and geochemistry studies of mineralizations associated with the Agh Ziarat alkaline granite, southeastern Salmas city, NW Iran

Document Type : Research Paper

Author

master of exploration of mining engineering

Abstract

Agh Ziarat area is situated in the southeastern of the Salmas city. The important lithologic outcrops in this area are intrusive bodies well known as Qushchi granite which are late Carboniferous in age. Geochemically, these intrusive bodies have alkaline affinity and most likely classified as A-type granites. Moreover, a syenite body has cut this granite. The intrusion of granite body, into the reginal metamorphic rocks, has led to the metasomatism, alteration and mineralization processes. The Cu-Au-Mo mineralization has occurred in the pyrite-silica zones which have stockwork structure. Pyrite and melnikovite are the main sulfide minerals in altered zone. Arsenopyrite, chalcopyrite, sphalerite and galena are found in minor amounts. Microprobe mineralogical study indicates that gold has concentrated in pyrite within strongly silicified rocks. Average value of Au have obtained as 670 ppb in 70 lithogeochemical samples collected from mineralized zones and their maximum amount reach to 1.8 ppm. Au has a positive correlation coefficient with Mo (0.53). As is correlated with Co, Ni, Pb and Mo by the values 0.72, 0.53, 0.58, 0.57, respectively. Based on the geochemical factor analysis method three major factors are involved in mineralization. First factor includes As, Co, Ni, the second factor is Zn and Cu, and the third factor is Au, Mo and Pb.

Keywords

References

منابع
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New Findings in Applied Geology
Volume 10, Issue 20 - Serial Number 20
February 2016
Pages 121-137

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History

  • Receive Date: 01 July 2015
  • Revise Date: 08 May 2016
  • Accept Date: 09 May 2016

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