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Geology, mineralization, mineralogy and genesis of Pirgheshlagh Cu-Zn-Pb deposit, NW Zanjan

Document Type : Original Research Paper

Authors

1 M.Sc. Student, Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan, Iran

2 Assistant Professor, Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan, Iran

3 Assistant Professor, Faculty of Earth Sciences, Institute for Advance Studies in Basic Sciences (IASBS), Zanjan, Iran

4 M.Sc., Angouran Mining Company, Zanjan, Iran

Abstract

Pirgheshlagh Cu-Zn-Pb deposit is located in the Central Iranian zone, north-east of the Mahneshan in the Zanjan province. The Kahar Formation with Precambrian age is the oldest Formation in the area which cutted by the granitic dykes. The Pirgheshlagh Cu-Zn-Pb mineralization occurred mainly as tabular-shape within the metamorphosed sandstones, meta-andesitic tuff, meta-crystal lithic tuff and meta-andesite rocks. Based on the field and microscopic studies, the main minerals consist of chalcopyrite, sphalerite, galena, pyrite, arsenopyrite and minor magnetite. The ore textures consist of disseminated, laminated, massive and veinlet which the veinlet texture is occurred mainly in the lower part of deposit. Secondary minerals such as smithsonite, cerrusite, chalcocite, covellite, malachite, azurite, goethite and lepidochrosite have formed during supergene processes. The main alterations in the Pirgheshlagh deposit include silicic, sericitic, chlorite and carbonate. The results of this study suggest that the Cu-Zn-Pb mineralization in the Pirgheshlagh deposit is a Besshi-type valcogenic massive sulfide (VMS) mineralization.

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References
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Scientific Quarterly Journal of Geosciences
Volume 28, Issue 109
September 2018
Pages 133-148
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