Fluid inclusion and sulfur isotopic studies of lead-zinc deposits, northwestern Guizhou, China
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摘要: 黔西北铅锌成矿区位于扬子地块西南缘，矿床产于不同时代的碳酸盐岩建造中，其矿物组合和热液蚀变特征类似于MVT型铅锌矿床。本文通过对该区部分铅锌矿床的矿石显微岩相学结构、矿物学与地球化学、脉石矿物和闪锌矿中流体包裹体岩相学与显微测温学以及硫同位素地球化学等研究，确定了该类型矿床成矿流体的性质及其成矿过程。结果表明，黔西北地区不同赋矿层位铅锌矿床具有相似的成矿流体特征，为中低温（160~260℃）、较高盐度（10%~22% NaCleqv）、含有低密度的CO2、CH4和N2的卤水，不同于MVT型铅锌矿床成矿流体特征；硫同位素地球化学研究揭示，这些铅锌矿床硫化物的δ34S范围均落在对应赋矿地层时代蒸发岩中的硫酸盐和生物成因硫化物的δ34S演化曲线上或其附近，表明这些铅锌矿床硫化物中的S可能主要来源于对应地层本身。结合地球化学热力学分析，认为Pb、Zn等成矿元素的Cl络合物是成矿元素的主要搬运形式，富含Pb、Zn的成矿流体与赋矿地层中富含H2S还原性流体的混合是铅锌富集成矿的重要机制之一。Abstract: Sediment-hosted lead-zinc deposits in northwestern Guizhou, China, are located on the southwest margin of the Yangtze craton and Youjiang orogenic belt. They are hosted by Proterozoic and Paleozoic carbonate rocks, and consist mainly of sphalerite, galena, and pyrite, with quartz, calcite and dolomite veins. Petrography, microthermometry, laser Raman spectroscopy analyses of fluid inclusions in quartz and sphalerite, and sulfur isotopic compositions of sulfides are used to characterize the ore-forming fluids associated with Pb-Zn mineralization in the northwestern Guizhou. The results show that the fluid inclusions in quartz are two-phase, aqueous inclusion and have higher homogenization temperatures (160~260℃) and salinities of 10%~22% NaCleqv, with low density of CO2, CH4 and N2, whereas the homogenization temperatures of two-phase aqueous inclusion in sphalerite range from 160~180℃, with salinities of 3%~23% NaCleqv. Sulfur isotopic compositions of sulfides indicate that reduced sulfur was mainly derived from the host rocks. We proposed that fluid mixing between metal-rich brines and reduced sulfur-bearing sedimentary formation waters is the most efficient process for Pb-Zn ore mineral precipitation.
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Key words:
- Fluid inclusion /
- Sphalerite and quartz /
- Sulfur isotope /
- Lead-zinc deposits /
- Northwestern Guizhou
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[1] Basuki NI and Spooner ETC. 2004. A review of fluid inclusion temperatures and salinities in Mississippi Valley-type Zn-Pb deposits:Identifying thresholds for metal transport. Exploration and Mining Geology, 11(1-4):1-17
[2] Chang ZS, Large RR and Maslennikov V. 2008. Sulfur isotopes in sediment-hosted orogenic gold deposits:Evidence for an early timing and a seawater sulfur source. Geology, 36(12):971-974
[3] Chen SJ. 1986. Research on the genesis of lead-zinc ore deposits in western Guizhou and northeastern Yunnan. Geology of Guizhou, (3):211-222 (in Chinese)
[4] Gu SY. 2007. Study on the sulfur isotopic compositions of lead-zinc deposits in northwestern Guizhou Province. Journal of Guizhou University of Technology (Natural Science Edition), 36(1):8-11 (in Chinese with English abstract)
[5] He LL, Xu GX, Yang ZP and Huang Q. 2013. Geology of Lvmaoping lead-zinc deposit, Pu'an, Guizhou. In:The Paper Collection for the First Conference of Guizhou Geological Association. Guiyang:Geological Society of Guizhou Province (in Chinese)
[6] Hu RZ and Zhou MF. 2012. Multiple Mesozoic mineralization events in South China:An introduction to the thematic issue. Mineralium Deposita, 47(6):579-588
[7] Hu RZ, Mao JW, Hua RM and Fan WM. 2015. Intra-Continental Mineralization of South China Craton. Beijing:Science Press, 1-903 (in Chinese)
[8] Hu XY, Cai GS, Su WC, Zeng DG and Wang D. 2013. Characteristics of ore forming fluid in sphalerite of Saojiwan lead-zinc deposit in the Northwest Guizhou Province, China. Acta Mineralogica Sinica, 33(3):302-307 (in Chinese with English abstract)
[9] Huang ZL, Hu RZ, Su WC, Wen HJ, Liu S and Fu YZ. 2011. A study on the large-scale Low-temperature Metallogenic Domain in southwestern China:Significance, history and new progress. Acta Mineralogica Sinica, 31(3):309-314 (in Chinese with English abstract)
[10] Jin ZG. 2006. Research on the ore-controlling factors, metallogenic regularity and prediction of lead-zinc ore district in Northwest Guizhou. Ph. D. Dissertation. Changsha:Central South University (in Chinese with English summary)
[11] Jin ZG, Zhang LW and Ye J. 2007. Ore-forming materials source of lead-zinc deposits in the Northwest Guizhou. Geology and Prospecting, 43(6):32-35 (in Chinese with English abstract)
[12] Leach DL, Sangster DF, Kelley KD, Large RR, Garven G, Allen CR, Gutzmer J and Walters SG. 2005. Sediment-hosted lead-zinc deposits:A global perspective. In:Hedenquist JW, Thompson JFH, Goldfarb RJ and Richards JP (eds.). Economic Geology 100th Anniversary Volume. Lancaster, Pa:Economic Geology Publishing Co., 561-607
[13] Liao W. 1984. Sulfur and lead isotopic characteristics and discussion of metallogenic models of lead-zinc metal areas in eastern Yunnan and western Guizhou. Geology and Prospecting, (1):2-6 (in Chinese)
[14] Liu HC. 1996. Metallogenic model of lead-zinc deposits in Dian-Chuan-Qian. Yunnan Geology, 15(1):41-51 (in Chinese)
[15] Liu YP. 2002. Preliminary study on the metallogenic regulation and the prospecting model for the Pb-Zn deposits in the areas of southwest Guizhou. Guizhou Geology, 19(3):169-174 (in Chinese with English abstract)
[16] Luo W, Kong L, Jin ZG and Dai TG. 2010. Study of ore-controlling structure and mineralization process of the lead-zinc deposits in the Northwest Guizhou. Mineral Resources and Geology, 24(1):35-43 (in Chinese with English abstract)
[17] Ou JX. 1996. Geological characteristics and ore-control geological conditions of Qingshan lead-zinc deposit, Guizhou. Journal of Guilin Institute of Technology, 16(3):277-282 (in Chinese with English abstract)
[18] Stoffell B, Appold MS, Wilkinson JJ, McClean NA and Jefferies TE. 2008. Geochemistry and evolution of Mississippi Valley-type mineralizing brines from the Tri-State and northern Arkansas districts determined by LA-ICP-MS microanalysis of fluid inclusions. Economic Geology, 103(7):1411-1435
[19] Tagirov BR and Seward TM. 2010. Hydrosulfide/sulfide complexes of zinc to 250℃ and the thermodynamic properties of sphalerite. Chemical Geology, 269(3-4):301-311
[20] Tu GC. 2002. Two unique mineralization areas in Southwest China. Bulletin of Mineralogy, Petrology and Geochemistry, 21(1):1-2 (in Chinese with English abstract)
[21] Wang HY. 1993. Geochemistry of Pb-Zn mineralization in Guizhou. Guizhou Geology, 10(4):272-290 (in Chinese with English abstract)
[22] Wang HY, Liang FL and Zeng DQ. 1996. Geology of Lead-Zinc Deposits in Guizhou. Guiyang:Guizhou Science and Technology Publishing House (in Chinese)
[23] Wang JZ, Li CY, Li ZQ, Li BH and Liu WZ. 2002. The comparison of Mississippi Valley-type lead-zinc deposits in southwest of China and in mid-continent of United States. Bulletin of Mineralogy, Petrology and Geochemistry, 21(2):127-132 (in Chinese with English abstract)
[24] Wilkinson JJ, Stoffell B, Wilkinson CC, Jeffries TE and Appold MS. 2009. Anomalously metal-rich fluids form hydrothermal ore deposits. Science, 323(5915):764-767
[25] Wu B and Chen GY. 2010. Study of quartz inclusion character and mining temperature of Shuidong lead-zinc deposit in Nayong, Guizhou. Guizhou Geology, 27(2):100-105 (in Chinese with English abstract)
[26] Xiao XG, Huang ZL, Zhou JX, Jin ZG, Li XB and Zhang LW. 2011. Several problems involved in genetic studies on the Pb-Zn deposits, Northwest Guizhou Province, China. Acta Mineralogica Sinica, 31(3):419-424 (in Chinese with English abstract)
[27] Xie JR. 1963. Deposits in China. Beijing:Academic Books and Periodicals Publishing House (in Chinese)
[28] Zhang CQ, Mao JW, Wu SP, Li HM, Liu F, Guo BJ and Gao DR. 2005. Distribution, characteristics and genesis of Mississippi Valley-Type lead-zinc deposits in Sichuan-Yunnan-Guizhou area. Mineral Deposits, 24(3):336-348 (in Chinese with English abstract)
[29] Zhang CQ, Yu JJ, Mao JW and Rui ZY. 2009. Advances in the study of Mississippi Valley-type deposits. Mineral Deposits, 28(2):195-210 (in Chinese with English abstract)
[30] Zhang DM, He LL, Zeng GQ, Yang KG, Dai CG and Zhang H. 2014. Superimposed deformation and its controlling effect on Pb-Zn deposits of Guanziyao region in West Guizhou. Guizhou Geology, 31(4):241-251 (in Chinese with English abstract)
[31] Zhou JX. 2011. Geochemistry of dispersed elements and zinc isotope in Carbonate-hosted lead-zinc ore deposits district, Northwest Guizhou Province, China. Ph. D. Dissertation. Guiyang:Institute of Geochemistry, Chinese Academy of Sciences (in Chinese with English summary)
[32] Zhou JX, Huang ZL, Zhou MF, Li XB and Jin ZG. 2013. Constraints of C-O-S-Pb isotope compositions and Rb-Sr isotopic age on the origin of the Tianqiao carbonate-hosted Pb-Zn deposit, SW China. Ore Geology Reviews, 53:77-92
[33] Zhou JX, Huang ZL, Lv ZC, Zhu XK, Gao JG and Mirnejad H. 2014. Geology, isotope geochemistry and ore genesis of the Shanshulin carbonate-hosted Pb-Zn deposit, Southwest China. Ore Geology Reviews, 63:209-225
[34] 陈士杰. 1986. 黔西滇东北铅锌矿成因探讨. 贵州地质, (3):211-222
[35] 顾尚义. 2007. 黔西北地区铅锌矿硫同位素特征研究. 贵州工业大学学报(自然科学版), 36(1):8-11
[36] 何良伦, 许光鑫, 杨致萍, 黄庆. 2013. 普安绿卯坪铅锌矿矿床地质特征. 见:贵州省地质学会青年工作委员会首届学术年会论文集. 贵阳:贵州省地质学会
[37] 胡瑞忠, 毛景文, 华仁民, 范蔚茗. 2015. 华南陆块陆内成矿作用, 北京:科学出版社, 1-903
[38] 胡晓燕, 蔡国盛, 苏文超, 曾道国, 王蝶. 2013. 黔西北筲箕湾铅锌矿床闪锌矿中的成矿流体特征. 矿物学报, 33(3):302-307
[39] 黄智龙, 胡瑞忠, 苏文超, 温汉捷, 刘燊, 符亚洲. 2011. 西南大面积低温成矿域:研究意义、历史及新进展. 矿物学报, 31(3):309-314
[40] 金中国. 2006. 黔西北地区铅锌矿控矿因素、成矿规律与找矿预测研究. 博士学位论文. 长沙:中南大学
[41] 金中国, 张伦尉, 叶静. 2007. 黔西北地区铅锌矿床成矿物质来源探讨. 地质与勘探, 43(6):32-35
[42] 廖文. 1984. 滇东、黔西铅锌金属区硫、铅同位素组成特征与成矿模式探讨. 地质与勘探, (1):2-6
[43] 柳贺昌. 1996. 滇、川、黔铅锌成矿区的成矿模式. 云南地质:15(1):41-51
[44] 刘幼平. 2002. 黔西北地区铅锌矿成矿规律及找矿模式初探. 贵州地质, 19(3):169-174
[45] 罗卫, 孔令, 金中国, 戴塔根. 2010. 黔西北地区铅锌矿床控矿构造与成矿. 矿产与地质, 24(1):35-43
[46] 欧锦秀. 1996. 贵州水城青山铅锌矿床的成矿地质特征. 桂林工学院学报, 16(3):277-282
[47] 涂光炽. 2002. 我国西南地区两个别具一格的成矿带(域). 矿物岩石地球化学通报, 21(1):1-2
[48] 王华云. 1993. 贵州铅锌矿的地球化学特征. 贵州地质, 10(4):272-290
[49] 王华云, 梁福谅, 曾鼎权. 1996. 贵州铅锌矿地质. 贵阳:贵州科技出版社
[50] 王奖臻, 李朝阳, 李泽琴, 李葆华, 刘文周. 2002. 川、滇、黔交界地区密西西比河谷型铅锌矿床与美国同类矿床的对比. 矿物岩石地球化学通报, 21(2):127-132
[51] 吴波, 陈国勇. 2010. 贵州纳雍水东铅锌矿床石英包裹体特征及成矿温度研究. 贵州地质, 27(2):100-105
[52] 肖宪国, 黄智龙, 周家喜, 金中国, 李晓彪, 张伦尉. 2011. 黔西北铅锌矿床成因研究中的几个问题. 矿物学报, 31(3):419-424
[53] 谢家荣. 1963. 中国矿床学总论. 北京:学术书刊出版社
[54] 张长青, 毛景文, 吴锁平, 李厚民, 刘峰, 郭保健, 高德荣. 2005. 川滇黔地区MVT铅锌矿床分布、特征及成因. 矿床地质, 24(3):336-348
[55] 张长青, 余金杰, 毛景文, 芮宗瑶. 2009. 密西西比型(MVT)铅锌矿床研究进展. 矿床地质, 28(2):195-210
[56] 张德明, 何良伦, 曾广乾, 杨坤光, 戴传固, 张慧. 2014. 黔西罐子窑地区叠加变形及其对铅锌矿床的控制作用. 贵州地质, 31(4):241-251
[57] 周家喜. 2011. 黔西北铅锌成矿区分散元素及锌同位素地球化学. 博士学位论文. 贵阳:中国科学院地球化学研究所
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