| 特提斯喜马拉雅东段扎西康矿集区姐纳各普金矿床成因:黄铁矿He⁃Ar及原位S同位素约束 |
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| 引用本文： | 李洪梁,李光明,张志,张林奎,董随亮,卿成实,李应栩. 特提斯喜马拉雅东段扎西康矿集区姐纳各普金矿床成因:黄铁矿He⁃Ar及原位S同位素约束[J]. 地球科学, 2021, 46(12): 4291-4315. DOI: 10.3799/dqkx.2021.018 |
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| 作者姓名： | 李洪梁 李光明 张志 张林奎 董随亮 卿成实 李应栩 |
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| 作者单位： | 中国地质科学院探矿工艺研究所,四川成都 611734;中国地质调查局成都地质调查中心,四川成都 610081;成都理工大学地球科学学院,四川成都 610059;中国地质调查局成都地质调查中心,四川成都 610081 |
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| 基金项目： | 中国地质调查局项目DD20190644中国地质调查局项目DD20190147国家自然科学基金项目91955208国家自然科学基金项目41702080国家自然科学基金项目41602214国家自然科学基金项目41807300国家科学技术部科技支撑计划重点项目2016YFC060308国家科学技术部科技支撑计划重点项目2018YFC0604103第二次青藏高原综合科学考察研究2019QZKK0902 |
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| 摘 要： | 姐纳各普金矿床是特提斯喜马拉雅东段扎西康矿集区内新近发现的中新世热液金矿床,但其成因认识较为模糊.矿体呈层状或似层状,严格受伸展断裂构造控制,具蚀变岩型和石英脉型2种矿石,主要发育硅化、黄铁矿化、绢云母化和方解石化.为厘定矿床成因,对矿床Ⅱ号和Ⅲ号矿体中的蚀变岩型矿石进行了系统采样,分析其黄铁矿He?Ar和原位S同位素...
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| 关 键 词： | 造山型金矿床 He-Ar同位素 原位S同位素 姐纳各普 扎西康矿集区 特提斯喜马拉雅 矿床 |
| 收稿时间： | 2020-12-16 |
Genesis of Jienagepu Gold Deposit in Zhaxikang Ore Concentration Area,Eastern Tethys Himalayas: Constraints from He-Ar and In-Situ S Isotope of Pyrite |
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| Abstract: | Jienagepu gold deposit is a newly discovered Miocene hydrothermal gold deposit in the Zhaxikang ore concentration area, eastern Tethyan Himalayas, but its genesis is rather vague. The ore body is stratified or approximately stratified, strictly controlled by extensional fault structure. In this study, two types of ores were recognized, namely altered rock type and quartz vein type, with extensive hydrothermal alternation, including silicification, pyritization, sericization and calcite. Samples were systematically taken from the altered rock type ore in orebody No. Ⅱ and No. Ⅲ, and the composition characteristics of He-Ar and in-situ S isotope of pyrite were analyzed to determine the genesis of the deposit. The results show that the content of 4He and 3He/4He ratio in pyrite ranged widely from 0.038×10-7 cm3 STP/g to 0.446×10-7 cm3 STP/g, 0.08 Ra to 0.09 Ra, with an average of 0.200×10-7 cm3 STP/g and 0.08 Ra. The content of 40Ar and 40Ar/36Ar ratio vary from 0.049×10-7 cm3 STP/g to 0.132×10-7 cm3 STP/g, 308.0 to 386.3, with an average of 0.084×10-7 cm3 STP/g and 347.1, indicating that the ore-forming fluid mainly originated from the crustal metamorphic fluid. The δ34S value of pyrite is concentrated, and the overall variation is between 1‰ and 3‰, with an average of 2.98‰, showing that the ore-forming material is from crustal-mantle homogenized deep source. Combined with previous research results, in this paper it holds that Jienagepu gold deposit is an orogenic type gold deposit, and the determination of genesis is of great significance to enrich and perfect the mineralization theory of continental collisional orogeny and to guide the exploration of regional ore deposits. |
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