Mineralogical characteristics and Pb isotopes of Gongdongchong lead-zinc polymetallic deposit, Dabie orogenic belt

WU Haoran; XIE Yuling; WANG Ying

2020 Vol. 39, No. 2-3

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WU Haoran, XIE Yuling, WANG Ying. Mineralogical characteristics and Pb isotopes of Gongdongchong lead-zinc polymetallic deposit, Dabie orogenic belt[J]. Geological Bulletin of China, 2020, 39(2-3): 338-352.

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WU Haoran, XIE Yuling, WANG Ying. Mineralogical characteristics and Pb isotopes of Gongdongchong lead-zinc polymetallic deposit, Dabie orogenic belt[J]. Geological Bulletin of China, 2020, 39(2-3): 338-352.

Mineralogical characteristics and Pb isotopes of Gongdongchong lead-zinc polymetallic deposit, Dabie orogenic belt

School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China

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Corresponding author: XIE Yuling, yulingxie63@hotmail.com

Received Date: 12 July 2019

Revised Date: 27 September 2019

Publish Date: 15 March 2020

Abstract

Abstract

The Gongdongchong Pb-Zn deposit, located on the north border of Dabie orogenic belt, Jinzhai County, Anhui Province, is a representative hydrothermal breccia-type lead-zinc polymetallic deposit in the Dabie Mountain region.The results of microscopic identification, SEM/EDS and EPMA of ore minerals indicate that silver exists mainly in the form of independent silver-bearing minerals, such as polybasite and Ag-tetrahedrite, which occur mainly in galena as micro-inclusions in the granular shape, columnar shape, lath shape and irregular form.The data ²⁰⁶Pb/²⁰⁴Pb (17.804~17.947), ²⁰⁷Pb/²⁰⁴Pb (15.567~15.669) and ²⁰⁸Pb/²⁰⁴Pb (38.496~38.886) of sulfides suggest that the ore-forming metals were derived from crust-mantle mixed source, being closely related to the Yanshanian magmatic activity.Metal ions such as Pb, Zn and Ag which were dissolved from magma migrate as chlorine-complex in the early stage of mineralization.As the temperature, salinity and f_O2 dropped and pH rose, Pb, Zn-chloride-complex was decomposed to form a lead-zinc breccia ore due to the decrease in stability in the ore-forming hydrothermal solution, while the Ag-ions formed sulfur-hydrogen-complex.When the temperature fell, the Ag-sulfur-hydrogen-complex were decomposed and precipitated.Meanwhile, Ag⁺ combined with Sb³⁺, As³⁺, and Cu⁺ to form a large amount of independent silver-bearing minerals.
- Gongdongchong Pb-Zn deposit /
- modes of occurrence of silver /
- EPMA /
- Pb isotope /
- Dabie orogenic belt

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