Abstract
The Bainiuchang deposit in Yunnan Province, China, is located geographically between the Gejiu ore field and the Dulong ore field. In addition to >7000 t Ag reserves, the deposit possesses large-scale Pb, Zn, Sn reserves and a mass of dispersed elements (i.e., In, Cd, Ge, Ga, etc.). Based on systematic studies of sulfur isotopic composition, the authors conclude: The Bainiuchang deposit experienced two epochs of metallogenesis, i.e., the Middle-Cambrian sea-floor exhalative sedimentary metallogenic epoch and the Yanshanian magmatic hydrothermal superimposition metallogenic epoch. In the two metallogenic epochs, the δ34S values of sulfides were all near 0, showing a tendency of being enriched slightly in heavy sulfur. The δ34S values of sulfides in the early metallogenic epoch are within the range of 2‰–5‰ with a peak value range of 2‰–3‰ and an average of 3.0‰, and those of sulfides in the late metallogenic epoch are within the range of 2‰–6‰ with a peak value of 3‰–4‰ and an average of 3.9‰. For the single metallogenic epoch, sulfur in the ore-forming fluids in the early epoch already reached isotopic equilibrium and was derived mainly from underneath the magma chamber or basement metamorphic igneous rocks. Sulfur in the sulfides in the late epoch was derived mainly from magmatic hydrothermal fluids formed in the process of remelting of the basement metamorphic igneous rocks.
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References
Bai Jingang, Chi Sanchuan, and Mei Jianming (1995) The typomorphic characteristics of pyrites and its genetic meaning in Bainiuchang silver-polymetallic deposit, Yunnan Province [J]. Journal of Precious Metallic Geology. 4, 302–306 (in Chinese with English abstract).
Chen Xueming, Deng Jun, Bai Jingang, and Shen Chonghui (2000) Mineralization fluid system of a Paleozoic sedimentary basin at Bainiuchang, Yunnan Province [J]. Geoscience. 14, 173–178 (in Chinese with English abstract).
Chen Xueming, Lin Zong, and Xie Fuchang (1998) Geological and geochemical characteristics of the Bainiuchang super-large silver polymetallic deposit of superimposed mineralization origin, Yunnan Province [J]. Scientia Geologica Sinica. 33, 115–123 (in Chinese with English abstract).
Dai Fusheng (1996) Characteristics and evolution of rock series, lithogenesis, metallogenesis of crust-derived anatectic magma in the Gejiu or field [J]. Yunnan Geology. 15, 330–344 (in Chinese with English abstract).
Gao Ziying (1996) Study on the Bainiuchang silver-polymetallic deposit in Mengzi [J]. Yunnan Geology. 15, 91–102 (in Chinese with English abstract).
Hua Renmin, Zhu Jinchu, Zhao Yiying, Zhou Jianping, Wu Yanyu, and Chen Xiaodong (1997) Preliminary study on the metallogenetic series of nonferrous metal deposits in the Youjiang fold belt [J]. Geological Journal of China Universities. 3, 183–191 (in Chinese with English abstract).
Jiang Xinpei (1990) The discussion of deposit characteristics and mineralizing process of the Bainiuchang silver polymetallic deposit in Mengzi [J]. Yunnan Geology. 9, 291–307 (in Chinese with English abstract).
Li Chaoyang (2004) The Characteristics of Several Massive Sulfide Deposits in the Western Part of the South China Fold System [Z]. The 32nd International Geological Congress, Florence-Italy August 20–28.
Li Jahe (1985) The characteristics and genesis of Gejiu granite [J]. Yunnan Geology. 4, 327–352 (in Chinese with English abstract).
Ohmoto H. (1972) Systematics of sulfur and carbon isotopes in hydrothermal ore deposits [J]. Econ Geol. 67, 551–579.
Ohmoto H. (1983) Stable isotope geochemistry of ore deposits [J]. Review of Mineralogy. 16, 491–560.
Wu Qinsheng, Xu Junzhen, and Yang Zhi (1984) Sr isotopic characteristics of Gejiu Sn-bearing granites and a study of ore search indicators [J]. Geochimica. (4), 293–302 (in Chinese with English abstract).
Zeng Zhigang, Jiang Fuqing, Qin Yunshan, and Zhai Shikui (2001) Sulfide isotopic composition of modern sea-floor hydrothermal sediment and its geologic significance [J]. Acta Oceanologica Sinica. 23, 48–56 (in Chinese with English abstract).
Zhang Qian (1990) Principal geological and geochemical features of Pb-Zn deposits associated with pelite and fine detrital rocks and their time-bound factors [J]. Geochimica. (3), 230–238 (in Chinese with English abstract)
Zhang Shitao and Chen Guochang (1997) The geological features and evolution of the Bozhushan complex granite body in Southeast Yunnan [J]. Yunnan Geology. 16, 222–232 (in Chinese with English abstract).
Zhou Jianping, Xu Keqing, Hua Renmin, Zhao Yiying, and Zhu Jinchu (1998) Characteristics and genesis of exhalative sedimentary massive sulfides in southeastern Yunnan Province [J]. Acta Mineralogical Sinica. 18, 158–168 (in Chinese with English abstract).
Zhou Jianping, Xu Keqing, Hua Renmin, and Zhao Yiying (1997) Discussion on genesis of the Tin polymetallic sulfide deposit of southeastern Yunnan [J]. Yunnan Geology. 16, 309–49 (in Chinese with English abstract).
Zhu Chaohui, Zhang Qian, and He Yuliang (2005) The characteristics of mineralizing materials of the Bainiuchang silver polymetallic ore deposit in southeastern Yunnan [J]. Bulletin of Mineralogy, Petrology and Geochemistry. 24, 327–332 (in Chinese with English abstract).
Zhu Chaohui, Zhang Qian, Shao Shuxun, Zhu Xiaoqing, He Yuliang, and Wang Dapeng (2007) Sea-floor exhalative sedimentary and magmatic hydrothermal superimposition of the Bainiuchang polymetallic deposit in Yunnan: Evidence from REE Geochemistry [J]. Chinese Journal of Geochemistry. 26, 267–275.
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Xie, H., Zhu, C., Zhang, Q. et al. Sulfur isotopic composition of the Bainiuchang super-large Ag polymetallic deposit, Yunnan Province, China: Implications for the source of sulfur in ore-forming fluids. Chin. J. Geochem. 28, 284–292 (2009). https://doi.org/10.1007/s11631-009-0284-6
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DOI: https://doi.org/10.1007/s11631-009-0284-6