Fluid Inclusions Constraints on the Origin of the Xiaobaishitou W-Mo Deposit in Hami, Xinjiang, NW China
-
摘要: 新疆哈密小白石头钨钼矿床位于中天山地块,是北疆代表性的钨钼矿床,但人们对其成矿流体性质和矿床成因类型了解得很少.矿床地质研究表明,矿体主要产于三叠纪黑云母花岗岩与蓟县系卡瓦布拉克群碳酸盐岩接触带,根据穿插关系和矿物组合,成矿阶段可划分为干矽卡岩、湿矽卡岩、氧化物、硫化物和碳酸盐5个阶段,白钨矿和辉钼矿分别形成于氧化物和硫化物阶段.流体包裹体显微测温结果表明,成矿早期(干矽卡岩阶段)流体为中高温、中高盐度的NaCl-H2O-CO2体系,成矿晚期(碳酸盐阶段)演变为低温、低盐度的NaCl-H2O体系.小白石头矿床为矽卡岩型钨钼矿床,流体包裹体特征指示流体混合及降温可能是矿质沉淀的主要机制.Abstract: The Xiaobaishitou W-Mo deposit is one of the typical W-Mo deposits in North Xinjiang, located in the eastern Tianshan Orogen. The ore body mainly occurs in the contact zone between Triassic biotite granite and crystalline limestone of the Mesoproterozoic Kawabulag Group. However, the characteristics of metallogenic fluid and genetic type of the Xiaobaishitou deposit remain relatively unclear. Based on the ore textures, structures and mineral assemblages observed, it is inferred that the deposit has been formed in a five-stage hydrothermal process, namely dry skarn, wet skarn, oxide, sulfide and carbonate stages. Scheelite and molybdenite occurred in oxide and sulfide stages, respectively. Microthermometric data show that the ore fluid system evolved from CO2-rich, probably magmatic hydrothermal to CO2-poor, meteoric fluid. The microthermometric results also suggest that metal precipitation resulted from fluid mixing and cooling. Here we propose that the Xiaobaishitou W-Mo deposit may be a skarn mineral system.
-
图 1 中亚造山带构造简图(a)和东天山区域地质及矿床分布(b)
Fig. 1. Tectonic sketch of the Central Asian orogenic belt (a) and regional geological sketch in the East Tianshan, showing deposit distribution (b)
图 3 小白石头钨矿床1矿段No.8勘探线剖面
Fig. 3. The profile of No.8 exploration line in Xiaobaishitou tungsten deposit
表 1 小白石头矿床流体包裹体测温结果
Table 1. Microthermometric data of fluid inclusions of the Xiaobaishitou deposit
成矿阶段 测试矿物 类型 完全均一温度(℃) 冰点/子矿物消失温度(℃) 盐度(% NaCleqv) 密度(g/cm3) 干矽卡岩阶段 石榴石 W型 210~297 -5.6~-2.4 4.0~8.7 0.64~0.93 C型 271~288 8.9~10.0 湿矽卡岩阶段 绿帘石 W型 182~268 -2.0~-6.6 3.4~10.0 0.82~0.93 氧化物阶段 白钨矿 W型 199~228 -5.1~-0.7 1.2~8.0 0.88~0.92 W型 185~232 -4.8~-2.4 4.0~7.6 0.87~0.92 氧化物阶段 石英 C型 199~211 8.0~8.8 S型 212 318.9 39.7 1.18 硫化物阶段 石英 W型 151~245 -6.1~-1.1 1.9~9.3 0.84~0.96 C型 177~266 4.1~9.4 碳酸盐阶段 方解石 W型 124~201 -5.7~-0.5 1.0~8.8 0.90~0.98 表 2 典型矽卡岩矿床的特征
Table 2. Geological characteristics of typical skarn deposits
-
Bowers, T.S., Helgeson, H.C., 1983.Calculation of the Thermodynamic and Geochemical Consequences of Nonideal Mixing in the System H2O-CO2-NaCl on Phase Relations in Geologic Systems:Equation of State for H2O-CO2-NaCl Fluids at High Pressures and Temperatures.Geochimica et Cosmochimica Acta, 47(7):1247-1275. https://doi.org/10.1016/0016-7037(83)90066-2 Brown, P.E., 1989.Flincor:A Microcomputer Program for the Reducrion and Investigation of Fluid-Inclusion Data.American Mineralogist, 74(11-12):1390-1393. https://www.researchgate.net/publication/279895263_FLINCOR_a_microcomputer_program_for_the_reduction_and_investigation_of_fluid-inclusion_data Chen, H.Y., Chen, Y.J., Baker, M.J., 2012.Evolution of Ore-Forming Fluids in the Sawayaerdun Gold Deposit in the Southwestern Chinese Tianshan Metallogenic Belt, Northwest China.Journal of Asian Earth Sciences, 49(3):131-144. https://doi.org/10.1016/j.jseaes.2011.05.011 Chen, Y.J., 2000.Progress in the Study of Central Asia-Type Orogenesis-Metallogenesis in Northwest China.Geological Journal of China Universities, 6(1):17-22 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-GXDX200001001.htm Chen, Y.J., Li, N., 2009.Nature of Ore-Fluids of Intracontinental Intrusion-Related Hypothermal Deposits and Its Difference from Those in Island Arcs.Acta Petrologica Sinica, 25(10):2477-2508 (in Chinese with English abstract). https://www.researchgate.net/publication/268074830_Nature_of_ore-fluids_of_intracontinental_intrusion-related_hypothermal_deposits_and_its_difference_from_those_in_island_arcs Chen, Y.J., Ni, P., Fan, H.R., et al., 2007.Diagnostic Fluid Inclusions of Different Types Hydrothermal Gold Deposits.Acta Petrologica Sinica, 23(9):2085-2108 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTotal-YSXB200709009.htm Chen, Y.R., 2006.Geological Characteristics and Genesis Analysis of Xiaobaishitou W-Mo Deposit in Xinjiang.Gansu Metallurgy, 28(3):75-77(in Chinese). https://www.researchgate.net/publication/228897501_Geological_and_geochemical_characteristics_and_ore_genesis_of_the_Keketale_VMS_Pb-Zn_deposit_Southern_Altai_Metallogenic_Belt_NW_China Collins, P.L.F., 1979.Gas Hydrates in CO2-Bearing Fluid Inclusions and the Use of Freezing Data for Estimation of Salinity.Economic Geology, 74(6):1435-1444. https://doi.org/10.2113/gsecongeo.74.6.1435 Deng, X.H., Chen, Y.J., Santosh, M., et al., 2017.U-Pb Zircon, Re-Os Molybdenite Geochronology and Rb-Sr Geochemistry from the Xiaobaishitou W (-Mo) Deposit:Implications for Triassic Tectonic Setting in Eastern Tianshan, NW China.Ore Geology Reviews, 80:332-351. https://doi.org/10.1016/j.oregeorev.2016.05.013 Deng, X.H., Wang, J.B., Pirajno, F., et al., 2016.Re-Os Dating of Chalcopyrite from Selected Mineral Deposits in the Kalatag District in the Eastern Tianshan Orogen, China.Ore Geology Reviews, 77:72-81. https://doi.org/10.1016/j.oregeorev.2016.01.014 Guo, Z.J., Li, J.W., Huang, M.H., 2016.Characteristics of Ore-Forming Fluid in Honghuaerji Scheelite Deposit, Inner Mongolia.Mineral Deposits, 35(1):1-17 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTotal-KCDZ201601001.htm Hall, D.L., Sterner, S.M., Bodnar, R.J., 1988.Freezing Point Depression of NaCl-KCl-H2O Solutions.Economic Geology, 83(1):197-202. https://doi.org/10.2113/gsecongeo.83.1.197 Han, C.M., Xiao, W.J., Zhao, G.C., et al., 2014.Late Paleozoic Metallogenesis and Evolution of the East Tianshan Orogenic Belt (NW China, Central Asia Orogenic Belt).Geology of Ore Deposits, 56(6):493-512. https://doi.org/10.1134/s1075701514060075 Jiang, X., Guo, Y.M., Yang, L.Z., 2012.Geological Characteristics and Preliminary Origin of Shadong Large Tungsten Deposit in Hami, Xinjiang.Xinjiang Geology, 30(1):31-35 (in Chinese with English abstract). doi: 10.1007%2Fs12583-017-0808-7 Kröner, A., Kovach, V., Belousova, E., et al., 2014.Reassessment of Continental Growth during the Accretionary History of the Central Asian Orogenic Belt.Gondwana Research, 25(1):103-125. https://doi.org/10.1016/j.gr.2012.12.023 Li, G.M., Cao, M.J., Qin, K.Z., et al., 2016.Geochronology, Petrogenesis and Tectonic Settings of Pre- and Syn-Ore Granites from the W-Mo Deposits (East Kounrad, Zhanet and Akshatau), Central Kazakhstan.Lithos, 252-253:16-31. https://doi.org/10.1016/j.lithos.2016.01.023 Li, J.Y., Wang, K.Z., Li, W.Q., et al., 2002.Tectonic Evolution since the Late Paleozoic and Mineral Prospecting in Eastern Tianshan Mountains, NW China.Xinjiang Geology, 20(4):295-301 (in Chinese with English abstract). Li, P., Lü, X.B., Chen, C., et al., 2011.Geochronology and Geochemical Characteristics of the Biotite-Granite in the Xiaobaishitou Tungsten Deposit, East Tian Shan Mountains of Xinjiang and Their Geological Implications.Geology and Exploration, 47(4):543-554(in Chinese with English abstract). http://d.old.wanfangdata.com.cn/Periodical/dzykt201104002 Li, Q., He, Z.Z., 2016.Geologic Features and Prospecting Thinking of Xiaobaishitou W-Mo Deposit in Beishan, Gansu.Gansu Science and Technology, 32(10):20-25 (in Chinese). Lu, H.Z., Fan, H.R., Ni, P., et al., 2004.Fluid Inclusions.Science Press, Beijing (in Chinese). Mao, J.W., Yang, J.M., Han, C.M., et al., 2002.Metallogenic Systems of Polymetallic Copper and Gold Deposits and Related Metallogenic Geodynamic Model in Eastern Tianshan, Xinjiang.Earth Science, 27(4):413-424(in Chinese with English abstract). https://www.researchgate.net/publication/308168546_Metallogenic_systems_of_polymetallic_copper_and_gold_deposits_and_related_metallogenic_geodynamic_model_in_Eastern_Tianshan_Xinjiang Mao, Q.G., Wang, J.B., Fang, T.H., et al., 2016.Geological Characteristics of Honghai VMS Type Deposit of Kalatage Ore Belt and Discussion of Deposit Genesis Type in the Eastern Tianshan.Mineral Exploration, 7(1):17-30 (in Chinese with English abstract). Qin, K.Z., Sun, S., Li, J.L., et al., 2002.Division of Six Tectonic Stages of Major Metallic Deposits in Northern Xinjiang and Its Implications.Mineral Deposits, 21(S1):203-206 (in Chinese with English abstract). https://www.sciencedirect.com/science/article/pii/S0169136805000260 Rui, Z.Y., Liu, Y.L., Wang, L.S., et al., 2002.The Eastern Tianshan Porphyry Copper Belt in Xinjiang and Its Tectonic Framework.Acta Geologica Sinica, 76(1):83-94(in Chinese with English abstract). https://www.researchgate.net/publication/279707421_Geochronology_tectonic_setting_and_mineralization_of_granitoids_in_Jueluotage_area_eastern_Tianshan_Xinjiang Șengör, A.M.C., Natal'in, B.A., Burtman, V.S., 1993.Evolution of the Altaid Tectonic Collage and Palaeozoic Crustal Growth in Eurasia.Nature, 364(6435):299-307. https://doi.org/10.1038/364299a0 Shen, P., Pan, H.D., Zhou, T.F., et al., 2014.Petrography, Geochemistry and Geochronology of the Host Porphyries and Associated Alteration at the Tuwu Cu Deposit, NW China:A Case for Increased Depositional Efficiency by Reaction with Mafic Hostrock? Mineralium Deposita, 49(6):709-731. https://doi.org/10.1007/s00126-014-0517-4 Soloviev, S.G., 2011.Geology, Mineralization, and Fluid Inclusion Characteristics of the Kensu W-Mo Skarn and Mo-W-Cu-Au Alkalic Porphyry Deposit, Tien Shan, Kyrgyzstan.Economic Geology, 106(2):193-222. https://doi.org/10.2113/econgeo.106.2.193 Soloviev, S.G., 2015.Geology, Mineralization, and Fluid Inclusion Characteristics of the Kumbel Oxidized W-Cu-Mo Skarn and Au-W Stockwork Deposit in Kyrgyzstan, Tien Shan.Mineralium Deposita, 50(2):187-220. https://doi.org/10.1007/s00126-014-0531-6 Soloviev, S.G., Kryazhev, S., 2017.Geology, Mineralization, and Fluid Inclusion Characteristics of the Chorukh-Dairon W-Mo-Cu Skarn Deposit in the Middle Tien Shan, Northern Tajikistan.Ore Geology Reviews, 80:79-102. https://doi.org/10.1016/j.oregeorev.2016.06.021 Tang, Y.A., Lai, J.Q., Yang, M., et al., 2017.Characteristics of Fluid Inclusions of the Yiliu Tungsten Deposit in Shaoguan, Guangdong Province and Implications for Metallogenesis.Acta Geologica Sinica, 91(10):2240-2255 (in Chinese with English abstract). https://www.mindat.org/show.php?id=2526&ld=1 Wang, D.H., Li, C.J., Chen, Z.H., 2006.Metallogenic Characteristics and Direction in Mineral Search in the East Tianshan, Xinjiang, China.Geological Bulletin of China, 25(8):910-915 (in Chinese with English abstract). https://www.sciencedirect.com/science/article/pii/S0169136813002023 Wang, J., Sun, F.Y., Yu, L., et al., 2017.Fluid Inclusions and H-O-S-Pb Istope Systematics of the Galonggema Cu Deposit in Yushu, Qinghai Province, China.Earth Science, 42(6):941-956 (in Chinese with English abstract). https://doi.org/10.3799/dqkx.2017.074 Wang, J.B., Wang, Y.W., He, Z.J., 2006.Ore Deposits as a Guide to the Tectonic Evolution in the East Tianshan Mountains, NW China.Geology in China, 33(3):461-469 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-DIZI200603001.htm Wang, Y.H., Zhang, F.F., 2016.Petrogenesis of Early Silurian Intrusions in the Sanchakou Area of Eastern Tianshan, Northwest China, and Tectonic Implications:Geochronological, Geochemical, and Hf Isotopic Evidence.International Geology Review, 58(10):1294-1310. https://doi.org/10.1080/00206814.2016.1152516 Windley, B.F., Alexeiev, D., Xiao, W., et al., 2007.Tectonic Models for Accretion of the Central Asian Orogenic Belt.Journal of the Geological Society, 164(1):31-47. https://doi.org/10.1144/0016-76492006-022 Wu, S.H., Wang, X.D., Xiong, B.K., 2014.Fluid Inclusion Studies of the Xianglushan Skarn Tungsten Deposit, Jiangxi Province, China.Acta Petrologica Sinica, 30(1):178-188 (in Chinese with English abstract). http://d.old.wanfangdata.com.cn/Periodical/ysxb98201401013 Wu, Y.S., Chen, Y.J., Zhou, K.F., 2017.Mo Deposits in Northwest China:Geology, Geochemistry, Geochronology and Tectonic Setting.Ore Geology Reviews, 81:641-671. https://doi.org/10.1016/j.oregeorev.2016.07.010 Xiao, B., Chen, H.Y., Hollings, P., et al., 2017.Magmatic Evolution of the Tuwu-Yandong Porphyry Cu Belt, NW China:Constraints from Geochronology, Geochemistry and Sr-Nd-Hf Isotopes.Gondwana Research, 43:74-91. https://doi.org/10.1016/j.gr.2015.09.003 Xiao, B., Chen, H.Y., Wang, Y.F., et al., 2017.Zircon U-Pb and Molybdenite Re-Os Dating of the Tuwu-Yandong Cu Deposit Belt of the Eastern Tianshan Mountains and Its Geological Significance.Geotectonica et Metallogenia, 41(1):145-156 (in Chinese with English abstract). https://www.deepdyve.com/lp/elsevier/sims-zircon-u-pb-and-molybdenite-re-os-geochronology-hf-isotope-and-xPI0I01Mzn Xiao, W.J., Windley, B.F., Allen, M.B., et al., 2013.Paleozoic Multiple Accretionary and Collisional Tectonics of the Chinese Tianshan Orogenic Collage.Gondwana Research, 23(4):1316-1341. https://doi.org/10.1016/j.gr.2012.01.012 Xiao, W.J., Zhang, L.C., Qin, K.J., et al., 2004.Paleozoic Accretionary and Collisional Tectonics of the Eastern Tianshan (China):Implications for the Continental Growth of Central Asia.American Journal of Science, 304(4):370-395. https://doi.org/10.2475/ajs.304.4.370 Zhang, B.L., Jia, W.C., Shen, X.L., et al., 2010.The Distribution, Type, Time and Tectonic Setting of the Tungsten Ore in the Northern Orogenic Belt.Mineral Deposits, 29(S1):327-328 (in Chinese). Zhang, L.C., Xiao, W.J., Qin, K.Z., et al., 2006.The Adakite Connection of the Tuwu-Yandong Copper Porphyry Belt, Eastern Tianshan, NW China:Trace Element and Sr-Nd-Pb Isotope Geochemistry.Mineralium Deposita, 41(2):188-200. https://doi.org/10.1007/s00126-006-0058-6 Zhou, T.F., Yuan, F., Zhang, D.Y., et al., 2010.Geochronology, Tectonic Setting and Mineralization of Granitoids in Jueluotage Area, Eastern Tianshan, Xinjiang.Acta Petrologica Sinica, 26(2):478-502 (in Chinese with English abstract). Zhou, X.B., Li, J.F., Wang, K.Y., et al., 2016.Geochemical Characteristics of Ore-Forming Fluid in Huanggoushan Gold Deposit, Jilin Province.Earth Science, 41(1):121-130 (in Chinese with English abstract). https://doi.org/10.3799/dqkx.2016.009 陈衍景, 2000.中国西北地区中亚型造山成矿作用的研究意义和进展.高校地质学报, 6(1): 17-22. doi: 10.3969/j.issn.1006-7493.2000.01.002 陈衍景, 李诺, 2009.大陆内部浆控高温热液矿床成矿流体性质及其与岛弧区同类矿床的差异.岩石学报, 25(10): 2477-2508. http://d.old.wanfangdata.com.cn/Periodical/ysxb98200910016 陈衍景, 倪培, 范宏瑞, 等, 2007.不同类型热液金矿系统的流体包裹体特征.岩石学报, 23(9): 2085-2108. doi: 10.3969/j.issn.1000-0569.2007.09.009 陈友仁, 2006.新疆小白石头钨钼矿床地质特征及成因分析.甘肃冶金, 28(3): 75-77. doi: 10.3969/j.issn.1672-4461.2006.03.030 郭志军, 李进文, 黄蒙辉, 2016.内蒙古红花尔基白钨矿矿床流体包裹体研究.矿床地质, 35(1): 1-17. http://d.old.wanfangdata.com.cn/Periodical/kcdz201601001 姜晓, 郭勇明, 杨良哲, 2012.哈密沙东大型钨矿床地质特征及成因探讨.新疆地质, 30(1): 31-35. doi: 10.3969/j.issn.1000-8845.2012.01.006 李锦轶, 王克卓, 李文铅, 等, 2002.东天山晚古生代以来大地构造与矿产勘查.新疆地质, 20(4): 295-301. doi: 10.3969/j.issn.1000-8845.2002.04.001 李鹏, 吕新彪, 陈超, 等, 2011.新疆东天山小白石头黑云母花岗岩年代学、地球化学特征及其地质意义.地质与勘探, 47(4): 543-554. http://d.old.wanfangdata.com.cn/Periodical/dzykt201104002 李强, 何智祖, 2016.甘肃北山小白石头钨钼矿床地质特征及找矿思路.甘肃科技, 32(10): 20-25. doi: 10.3969/j.issn.1000-0952.2016.10.009 卢焕章, 范宏瑞, 倪培, 等, 2004.流体包裹体.北京:科学出版社. 毛景文, 杨建民, 韩春明, 等, 2002.东天山铜金多金属矿床成矿系统和成矿地球动力学模型.地球科学, 27(4): 413-424. doi: 10.3321/j.issn:1000-2383.2002.04.010 毛启贵, 王京彬, 方同辉, 等, 2016.东天山红海火山成因块状硫化物矿床地质特征及成因类型探讨.矿产勘查, 7(1): 17-30. doi: 10.3969/j.issn.1674-7801.2016.01.003 秦克章, 孙枢, 李继亮, 等, 2002.北疆古生代矿床组合的六大构造阶段划分及其意义.矿床地质, 21(增刊1): 203-206. http://d.old.wanfangdata.com.cn/Conference/4400379 芮宗瑶, 刘玉琳, 王龙生, 等, 2002.新疆东天山斑岩型铜矿带及其大地构造格局.地质学报, 76(1): 83-94. http://d.old.wanfangdata.com.cn/Periodical/dizhixb200201011 唐一昂, 赖健清, 杨牧, 等, 2017.广东韶关市一六钨矿床流体包裹体特征及成矿作用.地质学报, 91(10): 2240-2255. doi: 10.3969/j.issn.0001-5717.2017.10.007 王登红, 李纯杰, 陈郑辉, 2006.东天山成矿规律与找矿方向的初步研究.地质通报, 25(8): 910-915. doi: 10.3969/j.issn.1671-2552.2006.08.002 王键, 孙丰月, 禹禄, 等, 2017.青海玉树尕龙格玛VMS型矿床流体包裹体及H-O-S-Pb同位素特征.地球科学, 42(6): 941-956. http://earth-science.net/WebPage/Article.aspx?id=3589 王京彬, 王玉往, 何志军, 2006.东天山大地构造演化的成矿示踪.中国地质, 33(3): 461-469. doi: 10.3969/j.issn.1000-3657.2006.03.002 吴胜华, 王旭东, 熊必康, 2014.江西香炉山矽卡岩型钨矿床流体包裹体研究.岩石学报, 30(1): 178-188. http://d.old.wanfangdata.com.cn/Periodical/ysxb98201401013 肖兵, 陈华勇, 王云峰, 等, 2017.东天山土屋-延东铜矿带石英钠长斑岩与辉钼矿形成年龄及其重要意义.大地构造与成矿学, 41(1): 145-156. http://d.old.wanfangdata.com.cn/Periodical/ddgzyckx201701012 张宝林, 贾文臣, 沈晓丽, 等, 2010.北方造山带钨矿的分布、类型、时代与构造背景.矿床地质, 29(增刊1): 327-328. http://d.old.wanfangdata.com.cn/Conference/7413365 周涛发, 袁峰, 张达玉, 等, 2010.新疆东天山觉罗塔格地区花岗岩类年代学、构造背景及其成矿作用研究.岩石学报, 26(2): 478-502. http://d.old.wanfangdata.com.cn/Periodical/ysxb98201002012 周向斌, 李剑锋, 王可勇, 等, 2016.吉林荒沟山金矿床成矿流体特征.地球科学, 41(1): 121-130. http://earth-science.net/WebPage/Article.aspx?id=3225 -