Mineral paragenesis and ore-forming processes of the Dongping Gold Deposit, Hebei Province, China

Wang, Dazhao, Liu, Jiajun, Zhai, Degao, Carranza, Emmanuel J.M., Wang, Yinhong, Zhen, Shimin, Wang, Jiang, Wang, Jianping, Liu, Zhenjiang, and Zhang, Fangfang (2019) Mineral paragenesis and ore-forming processes of the Dongping Gold Deposit, Hebei Province, China. Resource Geology, 69 (3). pp. 287-313.

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Abstract

The Dongping gold deposit is located near the center of the northern margin of the North China Craton. It is hosted in the Shuiquangou syenite and characterized by large amounts of tellurides. Numerous studies have addressed this deposit; the mineral paragenesis and ore-forming processes, however, are still poorly studied. In this contribution, a new mineral paragenesis has been evaluated to further understand ore formation, including sulfides (pyrite, chalcopyrite, galena, sphalerite, molybdenite, and bornite), tellurides (altaite, calaverite, hessite, muthmannite, petzite, rucklidgeite, sylvanite, tellurobismuthite, tetradymite, and volynskite), and native elements (tellurium and gold). Molybdenite, muthmannite, rucklidgeite, and volynskite are reported for the first time in this deposit. We consider the Dongping gold deposit mainly formed in the Devonian, and the ore-forming processes and the physicochemical conditions for ore formation can be reconstructed based on our newly identified ore paragenesis, that is, iron oxides -> (CO₂ effervescence) -> sulfides -> (fTe₂/fS₂ ratio increase) -> Pb-Bi-tellurides -> (condensation of H₂Te vapor) -> Au-Ag-tellurides -> (mixing with oxidizing water) -> carbonate and microporous gold -> secondary minerals -> secondary minerals. The logfO₂ values increase from the early to late stages, while the fH₂S and logfS₂ values increase initially and then decrease. CO₂ effervescence is the main mechanism of sulfides precipitation; this sulfidation and condensation of H₂Te vapor lead to deposition of tellurides. The development of microporous gold indicates that the deposit might experience overprint after mineralization. The Dongping gold deposit has a close genetic relationship with the Shuiquangou syenite, and tellurium likely originated from Shuiquangou alkaline magmatic degassing.

Item ID: 59972
Item Type: Article (Research - C1)
ISSN: 1751-3928
Keywords: Dongping gold deposit, North China Craton, ore-forming processes, physicochemical conditions, tellurides
Copyright Information: © 2019 The Society of Resource Geology.
Funders: National Natural Science Foundation of China (NNSF), Major Basic Research Program of People’s Republic of China (MBRP), China University of Geosciences (CUG), Ministry of Education and the State Administration of Foreign Experts Affairs, China (ME & SAFEA)
Projects and Grants: NNSF grants nos. 41573036 and 41730426, MBRP grant no. 2014CB440903, CUG MOST Special Fund from the State Key Laboratory of Geological Processes and Mineral Resources, CUG Fundamental Research Funds for the Central Universities grant no. 652017262, ME & SAFEA 111 Project grant no. B07011
Date Deposited: 24 Jul 2019 08:00
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040306 Mineralogy and Crystallography @ 100%
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