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现代地质 ›› 2021, Vol. 35 ›› Issue (06): 1622-1632.DOI: 10.19657/j.geoscience.1000-8527.2021.106

• 秦岭金——多金属成矿作用 • 上一篇    下一篇

南秦岭柞水—山阳矿集区夏家店金矿床黄铁矿微量元素和氢、氧、硫同位素对矿床成因的制约

丁坤1,2,3,4(), 王瑞廷2,3,4(), 刘凯5, 王智慧1, 申喜茂6   

  1. 1.陕西铁路工程职业技术学院,陕西 渭南 714099
    2.陕西省矿产资源综合利用工程技术研究中心,陕西 西安 710054
    3.西北有色地质矿业集团有限公司,陕西 西安 710054
    4.长安大学 地球科学与资源学院,陕西 西安 710054
    5.商洛西北有色七一三总队有限公司,陕西 商洛 726000
    6.西安西北有色地质研究院有限公司,陕西 西安 710054
  • 收稿日期:2020-12-02 修回日期:2021-10-20 出版日期:2021-12-10 发布日期:2022-02-14
  • 通讯作者: 王瑞廷
  • 作者简介:王瑞廷,男,博士,教授级高工,博士生导师,1969年出生,地球化学专业,主要从事矿床研究与矿产勘查工作。Email: wrtyf@163.com
    丁 坤,男,博士,讲师,1990年出生,矿产普查与勘探专业,主要从事矿床学研究。Email: 1003492885@qq.com
  • 基金资助:
    国家自然科学基金项目(41603040);陕西铁路工程职业技术学院科研项目(KY2020-42);陕西省教育厅科研计划项目(21JK0581);陕西铁路工程职业技术学院科技创新团队项目(KJTD202001)

Pyrite Trace Element, Hydrogen, Oxygen, and Sulfur Isotope Geochemistry of the Xiajiadian Gold Deposit in Zhashui-Shanyang Orefield, South Qinling Orogen, and Its Metallogenic Constraints

DING Kun1,2,3,4(), WANG Ruiting2,3,4(), LIU Kai5, WANG Zhihui1, SHEN Ximao6   

  1. 1. Shaanxi Railway Institute, Weinan,Shaanxi 714099, China
    2. Shaanxi Provincial Engineering and Technology Research Center for Comprehensive Utilization of Mineral Resources, Xi'an,Shaanxi 710054, China
    3. Northwest Geological Exploration for Nonferrous Metals, Xi'an,Shaanxi 710054, China
    4. School of Earth Science and Resources,Chang'an University, Xi'an,Shaanxi 710054, China
    5. No.713 Geological Team, Northwest Bureau of Geological Exploration for Nonferrous Metals, Shangluo,Shaanxi 726000,China
    6. Xi'an Northwest Research Institute of Nonferrous Metals Co.,Ltd., Xi'an,Shaanxi 710054, China
  • Received:2020-12-02 Revised:2021-10-20 Online:2021-12-10 Published:2022-02-14
  • Contact: WANG Ruiting

摘要:

为了研究柞水—山阳矿集区夏家店金矿床成因,采用LA-ICP-MS和LA-MC-ICP-MS技术分析夏家店金矿床矿体及围岩样品中黄铁矿原位微量元素及氢、氧、硫同位素组成特征。结果表明,该矿床黄铁矿的Co/Ni 比值为0.11~0.76,说明其与沉积作用有关。矿石中黄铁矿的δ34S值(-9.40‰~7.16‰)与围岩碳质板岩的δ34S值(-8.84‰~10.64‰)接近,黄铁矿的δ34S均值(2.47‰)基本落在岩浆硫的范围内,指示矿石硫可能由地层硫和岩浆硫混合而成。氢、氧同位素测试结果表明,夏家店矿床成矿流体可能主要来自岩浆水,成矿后期有大气降水的加入。综合矿床地质特征、成矿温度、金赋存状态等特征和黄铁矿微量元素、硫同位素组成可知,夏家店金矿床属于卡林型金矿,其成矿流体主要来自岩浆水,成矿后期有大气降水加入;其成矿物质是由深部岩浆与地层混合而成。

关键词: 矿床成因, S同位素, 微量元素, 夏家店金矿床, 柞水—山阳矿集区

Abstract:

To clarify the genesis of Xiajiadian gold deposit in the Zhashui-Shanyang orefield, in-situ trace element, hydrogen, oxygen and sulfur isotope compositions of the ore pyrite and wallrock samples were analyzed by LA-(MC)-ICP-MS techniques. The results show that the pyrite Co/Ni ratio ranges from 0.11 to 0.76, indicating that it is sedimentary pyrite. The pyrite δ34S value (-9.40‰ to 7.16‰) is close to that of the carbonaceous slate wallrock (-8.84‰ to 10.64 ‰), whilst the average pyrite δ34S value (2.47‰) falls within the magmatic sulfur range, suggesting that the ore sulfur may have sourced from the mixing of sedimentary sulfur with magmatic sulfur. The hydrogen-oxygen isotope data show that the ore-forming fluid was principally originated from magmatic water, with meteoric water input in the late-stage mineralization. Evidence from geological characteristics, ore-forming temperature, gold occurrence and pyrite trace elements and sulfur isotopes suggest that the deposit belongs to Carlin-type. The ore-forming fluid may have come mainly from magmatic water with late-stage meteoric water input, featuring a crust-mantle mixed source.

Key words: ore genesis, sulfur isotope, trace element, Xiajiadian gold deposit, Zhashui-Shanyang orefield

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