Intermediate sulfidation epithermal Pb-Zn-Cu (±Ag-Au) mineralization at Cheshmeh Hafez deposit, Semnan province, Iran
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- 作者：Behzad Mehrabi (1)
Majid Ghasemi Siani (1) - 关键词：Pb ; Cu ; Zn Mineralization ; Cheshmeh Hafez deposit ; Fluid inclusion ; Alteration ; Geochemistry ; Iran
- 刊名：Journal of the Geological Society of India
- 出版年：2012
- 出版时间：October 2012
- 年：2012
- 卷：80
- 期：4
- 页码：563-578
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Majid Ghasemi Siani (1)
1. Department of Geology, Faculty of science, Tarbiat Moallem University, Tehran, Iran - ISSN：0974-6889
文摘
The Cheshmeh Hafez epithermal base metal deposit is located in Troud-Chah Shirin mountain range in the Alborz magmatic belt of northern Iran. In this area, the Eocene volcanism and associated mineralization are controlled by NW-SE trending Anjilo and Troud major faults. Geological units are composed of porphyritic andesite, andesitic basalt, dacite, rhyodacite, trachyandesite and basalt, which are typically high-K igneous rocks transitional to shoshonites. Alteration in Cheshmeh Hafez area comprise of propylilitization, sericitization, argillization and silicification. Mineralization consists of three stages. Stage 1, quartz, carbonate with early pyrite I and chalcopyrite assemblages. Stage 2, the main stage of sulfide deposition, comprises early euhedral galena I followed by galena II and sphalerite, then galena III, chalcopyrite, tetrahedrite, pyrite II, bornite and digenite. Stage 3 involves the deposition of quartz and calcite barren veins with minor pyrite. The average assays from 12 channel samples of Cheshmeh Hafez veins are 0.15 g/t Au, 3.23 g/t Ag, 4.47 wt % Pb, 2.64 wt % Cu, and 1.73 wt % Zn. Fluid inclusion homogenization temperatures (Th) in quartz fall within the range of 140°-280°C with salinities ranging from 4.7 to 18 wt. % NaCl equivalent. Comparison of Th versus ice melting (Tmice) values indicates fluid dilution.