Citation: | GE Zhanlin, GU Xuexiang, ZHANG Yongmei, ZHENG Yanrong, LIU Ming, HAO Di, WANG Yuanwei. 2023. Mineralogical Characteristics and Metallogenic Indication of Gold−Bearing Sulfides in the Jinpenliang Gold Deposit, Zhashui−Shanyang Ore Cluster Area, South Qinling. Northwestern Geology, 56(5): 278-293. doi: 10.12401/j.nwg.2023118 |
The Jinpenliang gold deposit is located in the northern part of the Zhashui−Shanyang ore cluster area, South Qinling. The E−W trending main orebodies, occurring in sedimentary rocks of the Upper Devonian Tongyusi Formation, are strictly controlled by the left−lateral ductile faults. To date, there is still insufficient understanding of the ore mineralogy and gold mineralization processes. In this paper, we obtain data from a variety of experimental methods, such as petrographic identification, Back−Scattered Electron imaging (BSE), Energy Dispersive Spectrometry (EDS), and Electron Probe Micro−Analysis (EPMA), to determine the mineralogical characteristics of gold−bearing sulfides (arsenopyrite, pyrite, stibnite, and marcasite), and discuss the chemical states of Au and physicochemical conditions for gold mineralization. The results show that the micro−disseminated gold mineralization in hydrothermal period can be divided into three stages: pyrite−arsenopyrite−silicification stage (Ⅰ), quartz−stibnite−marcasite±antimony oxides stage (Ⅱ), and calcite−quartz stage (Ⅲ). The occurrence states of “invisible gold” vary greatly among different gold−bearing sulfides, from Au+ in arsenopyrite to Au+ and Au0 in early generation pyrite (Py-1), then to Au0 in late generation pyrite (Py-2) and marcasite. The metal mineral assemblage changes from arsenopyrite−pyrite to stibnite−marcasite, while the ore−forming fluid gradually evolves from relatively high−temperature solutions unsaturated with respect to native gold to low−temperature solutions saturated with respect to native gold. The Jinpenliang gold deposit is a Carlin−type gold deposit, which was formed in a medium−high temperature and shallow−moderate depth with logf(S2) ranging from −8.5 to −4.5.
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(a) Tectonic framework of the Qinliong orogen and (b) geological map of the Zhashui–Shanyang ore district cluster
Geological map of the Jinpenliang gold deposit
Photos of typical orebodies and ores of the Jinpenliang gold deposit
Microscopic characteristics of sulfides in ores of the Jinpenliang gold deposit
Paragenetic sequence of the Jinpenliang gold deposit
Relationships between selected elements of Au–bearing sulfides in the Jinpenliang gold depoist
Ternary Fe–As–S diagrams of gold–bearing sulfides in the Jinpenliang gold deposit
Correlation of Au–As values in arsenopyrite, pyrite, and marcasite from the Jinpenliang gold deposit
Logf(S2) vs. t equilibria diagram of arsenopyrite geothermometer