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《Mineral Deposits》 2001-01
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Mineral Association, Chemical Composition and Genetic Significance of Sham Gold Deposits in the Shizishan Orefield, Tongling Area, Anhui Province

Hu Huan, Wang Rucheng, Lu Jianjun and Liu Guanghua (1 Department of Earth Sciences of Nanjing University, Nanjing 210093; 2 No. 321 Geological party. Anhui Bureau of geology and Mineral Resources, Tongling 244031)  
The Baocun and Chaoshan gold deposits in Shizishan are field are of skarn type, and their intrusive rocks are Baocun quartz diorite and Baimangshan augite quartz diorite respectively. Gold grains from the deposits were thoroughly examined and analysed by means of reflected light microscope and electron probe microscope, and the results show that gold minerals in the primary zone of the Baocun and Chaoshan deposits all occur as individual native gold and often display silver-rim structure but exhibit obvious differences in modes of occurrence, carrier minerals, shape, sizes, content of Au and Ag, and fineness of gold grains in the two deposits. Gold minerals in the Baocun deposit occur as electrum and native gold, and electrum finenesses range from 605 to 911 with a mean of 831. Gold grains in the Chaoshan deposit consist of kustelite, electrum and native gold. Their finenesses range from 256 to 948 (averagely 729), being quite different in different sulfide minerals. According to the mode of occurrence of primary gold in deposits, the Baochun deposit is a Cu-Au association deposit, whereas the Chaoshan deposit is of Cu-Pb-Zn-Au association type. A comparison of the two deposits reveals that the significantly different modes of occurrence of gold between them are attributed to such factors of the fluids as gold complexes, temperature, pH and activity ratios of Au and Ag complexes. As gold was probably transported in the form of AuCl2, and its fineness was only controlled by temperature and aAgCl2-/aAuCl2-, gold from the Baocun Cu-Au association has higher fineness and much narrower fineness variation range. Nevertheless, in the Chaoshan deposit, gold migrated in the form of An(HS)2, its fineness was related to temperature, aAgCl2/aAu(HS)2-, aH2s and pH, so the gold grains there have lower fineness and wider range of variation. In the oxidized zones of Baocun and Chaoshan deposits, supergene gold occurs as native gold uniform in composition, and has higher fineness than primary gold, suggesting that in the case of moderate pH and high Eh, gold migrated mainly in the form of gold thiosulfate complex fluids.
【Fund】: 国家自然科学基金项目(编号:49673187)部分成果
【CateGory Index】: P618.51
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