Abstract
In order to study the characteristics of sea-floor exhalative sedimentary and magmatic hydrothermal superimposition on the Bainiuchang polymetallic deposit, the REE compositions of the granites, host-rocks and ores have been systematically analyzed by ICP-MS. As viewed from their REE compositions, the granites show obvious negative Eu anomalies and weak negative Ce anomalies. According to their REE characteristics, the host-rocks were derived partly from sea-floor exhalative sediments. In terms of their REE compositions, the ores can be divided into two groups: one group, of which the samples were collected from the Baiyang segment relatively far away from the Bozhushan granite batholith, possesses positive Eu anomalies or no Eu anomaly and negative Ce anomalies, indicating that ore-forming hydrothermal fluid was relatively reductive and its temperature was higher than 250°C. Furthermore, the coinstantaneous presence of positive Eu anomalies and negative Ce anomalies indicate that the convective mixing of a little amount of seawater with hydrothermal fluid had happened while ores were precipitated on ancient sea floor. The other group, of which the samples were mainly collected from the Chuanxindong and Duimenshan segments near the Bozhushan granite batholith, has similar chondrite-monalized REE distribution patterns to those of the magmatic rocks. But as a whole, the REE characteristics of both groups change gradually starting from the Bozhushan granite batholith. Based on the REE characteristics of the granites, host-rocks and ores, it is suggested that the ore-forming metals seem to have come from several different sources.
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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).
Bau M. (1991) Rare-earth element mobility during hydrothermal and metamorphic fluid-rock interaction and significance of the oxidation state of europium [J]. Chemical Geology. 93, 219–230.
Bostrom K, Rydell H., and Joensuu O. (1979) Langbank: An exhalative sedimentary deposit [J]. Econ. Geol. 74, 1002–1011.
Chen Duofu, Chen Guangqian, Pan jingming, Ma Shaogang, Dong Weiquan, Gao Jiyuan, and Chen Xianpei (1998) Hydrothermal Sedimentation Characteristics of the Dajiangping super large pyrite deposit, Yunfu, Guangdong [J]. Chinese Journal of Geochemistry. 17, 331–337.
Chen Xueming, Deng Jun, Bai Jingang, and Shen Chonghui (2000) Mineralization fluid system of 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, yunnan province [J]. Scientia Geologica Sinica. 33, 115–123 (in Chinese with English abstract).
Crerar D.A., Namson J., Chyi M.S., Williams L., and Feigenson M.D. (1982) Manganiferous chert of the Franciscan assemblage: I. General geology ancient and modern analogues and implication for hydrothermal convection at oceanic spreading centers [J]. Econ. Geol. 77, 519–540.
Deng Jun, Chen Xueming, Fang Yun, Cheng Xiaojiu, Shen Chonghui, and Wang Qingfen (2000) Characteristics of Late Paleozoic fluid system of the Yuebei sedimentary basin [J]. Earth Science Frontier. 7, 95–102 (in Chinese with English abstract).
Ding Zhenju, Liu Congqiang, Yao Shuzhen, and Zhou Zonggui (2000) REE composition of hydrothermal sediment in seafloor and its implication [J]. Information of Geologic Science and Technology. 19, 27–30 (in Chinese with English abstract).
Ding Zhenju, Yao Shuzhen, Liu Congqiang, Zhou Zonggui, and Yang Mingguo (2003) Characteristics of exhalation-sedimentary deposit of Dongouba polymertal deposit: Evidence from ore’s REE composition [J]. Acta Petrologic Sinica. 19, 792–798 (in Chinese with English abstract).
Gao Ziying (1996) On the genesis of the Bainiuchang silver-polymetallic deposit in Mengzi [J]. Yunnan Geology. 15, 91–102 (in Chinese with English abstract).
Hass J.R., Shock E.L., and Sassani D.C. (1995) Rare-earth elements in hydrothermal systems: Estimates of standard partial modal thermodynamic properties of aqueous complexes of the rare-earth elements at high pressures and temperature [J]. Geochim. Cosmochim. Acta. 59, 4329–4350.
Hua Renmin, Zhu Jinchu, Zhao Yiying, Zhou Jianping, Wu Yanyu, and Chen Xiaodong (1997) Preliminary study on metallogenetic series of nonferrous metal deposits in 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 Bainiuchang silver polymetallic deposit in Mengzi [J]. Yunnan Geology. 9, 291–307 (in Chinese with English abstract).
Klinkhammer G.P.E., Edmond J.M., Edmond J.M., and Mitra A. (1994) Geochemical implication of rare-earth element patterns in hydrothermal fluid from mid-ocean ridges [J]. Geochim. Cosmochim. Acta. 58, 5105–5133.
Mills R. and Elderfield H. (1995) Rare-earth element geochemistry of hydrothermal deposits from the active TAG mount, 26°N mid-Atlantic Ridge [J]. Geochim. Cosmochim. Acta. 59, 3511–3524.
Marching V., Gundlach H., Moller P., and Schley F. (1982) Some Geological indicators for discrimination between diagenetic and hydrothermal metalliferous sediments [J]. Marine Geology. 50, 241–256.
Mou Chuanlong, Yu Qian, and Zang Lisheng (2002) REE Geochemistry of the Lead-Zinc Ores from the Jinding Lead-Zinc Deposit, Lanping, Yunnan [J]. Chinese Journal of Geochemistry. 21, 57–64.
Murray R.W., Buchholtz T.B., Jones D.L., David L.G., and David C.R. (1990). Rare-earth elements as indicators of different marine depositional environments in chert and shale [J]. Geology. 18, 268–271.
Qi Liang, Hu Jing, and Gregoire D.C. (2000) Determination of trace elements in granites by inductively coupled plasma mass spectrometry [J]. Talanta. 51, 507–513.
Wang Zhonggan, Yu Xueyuan, and Zhao Zhenhua (1989) Geochemistry of Rare-Earth Elements [M]. pp.271–276. Science Press, Beijing (in Chinese).
Yang Shiyu (1991) Classification and type association of tin deposits in Southeast Yunnan tin belt [J]. Chinese Journal of Geochemistry. 10, 21–35.
Yang Yaomin, Tu Guamgzhi, and Hu Ruizhong (2004) REE and trace element geochemistry of Yinachang Fe-Cu-REE deposit, Yunnan Province, China [J]. Chinese Journal of Geochemistry. 23, 265–274.
Yomanoto K. (1987) Geochemical characteristics and depositional environments of cherts and associated rocks in the Franciscan and Schimanto terranes [J]. Sedimentary Geology. 52, 65–108.
Zhang Qian, Zhang Baogui, Pan Jiayong, and Cao Yubo (1992) Characteristics and REE model of the hot-water sedimentary siliceous rocks from the Dajiangping pyrite deposit in western Guangdong [J]. Chinese Science Bulletin. 37, 1588–1592 (in Chinese with English abstract).
Zhang Qian, Zhang Baogui, Cao Yubo, and Pan Jiayong (1993) REE characteristics of hot-water deposited silicalite in Dajiangping pyrite deposit [J]. Acta Petrologica Sinica. 9, 180–188 (in Chinese with English abstract).
Zhou Jianping, Xu Keqin, Hua Renmin, and Zhao Yiying (1997) A discussion on genesis of the tin polymetallic sulfide deposit of southeastern Yunnan [J]. Yunnan Geology. 16, 309–349 (in Chinese with English abstract).
Zhou Jianping, Xu Keqin, 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).
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Zhu, C., Zhang, Q., Shao, S. et al. Sea-floor exhalative sedimentary and magmatic hydrothermal superimposition on the Bainiuchang polymetallic deposit in Yunnan Province: REE geochemical evidence. Chin. J. of Geochem. 26, 267–275 (2007). https://doi.org/10.1007/s11631-007-0267-4
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DOI: https://doi.org/10.1007/s11631-007-0267-4