| 西藏甲岗雪山钨钼矿床成矿流体及成矿物质来源 |
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| 引用本文： | 徐培言,郑远川,杨竹森,沈阳,王梓轩,马睿,吴昌炟.西藏甲岗雪山钨钼矿床成矿流体及成矿物质来源[J].地球科学,2019,44(6):1974-1986. |
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| 作者姓名： | 徐培言 郑远川 杨竹森 沈阳 王梓轩 马睿 吴昌炟 |
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| 作者单位： | 1.中国地质大学地球科学与资源学院, 北京 100083 |
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| 基金项目： | 国家重点研发计划项目2016YFC0600310国家重点研发计划项目2016YFC0600306国家重点基础研究发展计划"973"项目2015CB452600国家自然科学基金项目41872083国家自然科学基金项目41472076中国地质调查局地质调查项目DD20160024-07中国地质调查局地质调查项目DD20160026中国地质调查局地质调查项目DD20179172基本科研业务费专项项目53200859424 |
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| 摘 要： | 甲岗雪山钨钼矿床位于西藏自治区申扎县境内,是西藏首例云英岩型钨矿床,关于该矿床的研究对探讨区域成矿机制和指导找矿都具有重要意义.成矿作用与矿区内的二长花岗岩紧密相关,矿体主要产于岩体内部和紧邻岩体的围岩中.矿体的类型包括云英岩型和石英脉型,矿石多呈细脉状或者浸染状产在云英岩或云英岩化二长花岗岩体内部,少量呈大脉状产于围岩地层中.为了研究该矿床成矿流体及成矿物质的来源,挑选云英岩型矿体和石英脉型矿体中的黑钨矿、石英进行H、O同位素测试,挑选金属硫化物进行S、Pb同位素测试.结果显示,黑钨矿δ18OV-SMOW(‰)值集中在3.7~4.7;石英的δ18O水值为2.0‰~4.3‰,δD值为-131‰^-84‰,表明成矿流体主要来源于脱气后的岩浆水,可能混入了极少量大气降水.矿石硫化物δ34S的值为+2.2‰^+5.3‰,表明硫来自岩浆;硫化物的206Pb/204Pb、207Pb/204Pb、208Pb/204Pb值分别为18.582 2~18.797 1、15.671 7~15.760 6、39.462 5~39.501 2,进一步表明成矿物质铅主要来源于中拉萨地体前寒武纪变质基底部分熔融产生的岩浆,可能有少量来自围岩地层.
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| 关 键 词： | 成矿流体 成矿物质 钨矿床 甲岗雪山 西藏 矿床 |
| 收稿时间： | 2018-10-23 |
Sources of Ore-Forming Fluids and Materials of Jiagangxueshan W-Mo Deposit |
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| Xu Peiyan,Zheng Yuanchuan,Yang Zhusen,Shen Yang,Wang Zixuan,Ma Rui,Wu Chang.Sources of Ore-Forming Fluids and Materials of Jiagangxueshan W-Mo Deposit[J].Earth Science-Journal of China University of Geosciences,2019,44(6):1974-1986. |
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| Authors: | Xu Peiyan Zheng Yuanchuan Yang Zhusen Shen Yang Wang Zixuan Ma Rui Wu Chang |
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| Affiliation: | (School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China;Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China) |
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| Abstract: | Jiagangxueshan W-Mo deposit, Shenzha County, is the first greisen-type W deposit in Tibet. Studying the deposit is of great significance in the regional metallogenic mechanism and prospecting. The mineralization is strongly linked with the monzogranite located in the center of the deposit, and ores usually occur in inner monzogranite or sedimentary wall rocks that are adjacent to the monzogranite. The orebody types of the deposit contain greisen-type and quartz vein-type. The majority of ores distribute in greisens and intensively greisenized monzogranites in the form of veinlets or dissemination, while the minority mainly precipitated in the sedimentary wall rocks, presenting as wide quartz veins. To investigate the sources of ore -forming fluids and materials of Jiagangxueshan W -Mo deposit, wolframites and quartzs, metal sulfides from greisen-and quartz vein-type orebodies are sellected for H, O and S-Pb isotope analysis, respectively. δ18OV-SMOW (‰) values of wolframite of the deposit range from 3.7-4.7. The hydrogen and oxygen isotope compositions of the quartzs selected from ores show that the δ18Owater values of quartzs are ranging from 2.0‰-4.3‰, with the δD values range from -131‰ to -84‰. The H-O data indicate that ore-forming fluids were derived from residual magma water after degassing. δ34S values of the sulfides range from +2.2‰ to +5.3‰, indicative of a magmatic source of sulfur. The values of 206Pb/204Pb、207Pb/204Pb、208Pb/204Pb are 18.582 2-18.797 1、15.671 7-15.760 6、39.462 5-39.501 2, respectively, which further show that the ore-forming materials were derived from Precambrian metamorphic basement of the central Lhasa subterrane. |
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| Keywords: | ore-forming fluid ore-forming material tungsten deposit Jiagangxueshan Tibet deposits |
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