吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (5): 1404-1417.doi: 10.13278/j.cnki.jjuese.20200026

• 整装勘查区矿床成因与成矿作用研究专辑 • 上一篇    下一篇

甘肃武都金坑子金矿床地球化学特征及成因探讨

范媛媛1, 刘云华1, 于晓飞2, 赵强3, 李小严1, 邓楠1, 马塬皓1   

  1. 1. 长安大学地球科学与资源学院, 西安 710054;
    2. 中国地质调查局发展研究中心/自然资源部矿产勘查技术指导中心, 北京 100037;
    3. 甘肃省地质矿产勘查开发局第三地质矿产勘查院, 兰州 730000
  • 收稿日期:2020-02-09 出版日期:2020-09-26 发布日期:2020-09-29
  • 通讯作者: 刘云华(1965-),男,研究员,主要从事矿产地质专业教学与研究工作,E-mail:280056933@qq.com E-mail:280056933@qq.com
  • 作者简介:范媛媛(1995-),女,硕士研究生,主要从事矿床学及矿产地质研究,E-mail:1191710657@qq.com
  • 基金资助:
    国家自然科学青年基金面上项目（41872219）；中国地质调查局项目（121201004000172201-48）

Geochemical Characteristics and Genesis of Jinkengzi Gold Deposit in Wudu Area, Gansu Province

Fan Yuanyuan1, Liu Yunhua1, Yu Xiaofei2, Zhao Qiang3, Li Xiaoyan1, Deng Nan1, Ma Yuanhao1   

  1. 1. School of Earth Science and Resources, Chang'an University, Xi'an 710054, China;
    2. Development and Research Center, China Geological Survey/Mineral Exploration Technical Guidance Center, Ministry of Natural Resources, Beijing 100037, China;
    3. The Third Institute of Geology and Mineral Exploration, Geological and Mineral Exploration and Development Bureau, Gansu Province, Lanzhou 730000, China
  • Received:2020-02-09 Online:2020-09-26 Published:2020-09-29
  • Supported by:
    Supported by General Program of National Natural Science Foundation for Youths (41872219) and Project of China Geological Survey (121201004000172201-48)

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摘要： 甘肃武都金坑子金矿床位于碧口地块北缘西秦岭南成矿亚带。本文为探讨金坑子金矿床成因，对矿床野外地质特征，H、O、S同位素组成及流体包裹体特征进行了系统的研究。研究结果表明：矿体产于千枚岩与灰岩岩性不整合面及其附近的断裂破碎带中，主要受断裂构造控制；不同成矿阶段石英的δDH2O-VSMOW值范围为-81.4‰~-67.5‰，δ18OH2O-VSMOW值范围为7.51‰~10.55‰，显示成矿流体早期主要来源于深源岩浆水，晚期有大气降水的加入；黄铁矿δ34S值变化范围为-0.7‰~0.6‰，显示成矿物质主要来源于深部岩浆，并有地层物质加入；流体包裹体的均一温度为155.6~304.0℃，盐度（w（NaCl））为0.53%~13.29%，显示成矿流体具中温、中低盐度和富含CO2的特点。结合区域研究资料，认为金坑子金矿床成因类型为印支晚期的中温热液脉型金矿床。

关键词: 地球化学, 流体包裹体, 稳定同位素, 矿床成因, 中温热液脉型矿床, 金坑子金矿床, 西秦岭南成矿亚带

Abstract: Jinkengzi gold deposit is located in the southern sub-belt of west Qinling metallogenic belt in the northern margin of Bikou block. In order to find out the genesis of Jinkengzi gold deposit, the field geological characteristics, hydrogen, oxygen, sulfur isotopic composition, and fluid inclusion characteristics of the deposit were systematically studied. The results show that the ore bodies occur in the unconformity of phyllite and limestone and the fracture zone nearby, which is mainly controlled by the fracture structure; the δDH2O-VSMOW value of quartz in the different mineralization stages ranges from -81.4‰ to -67.5‰, and δ18OH2O-VSMOW ranges from 7.51‰ to 10.55‰, indicating that the early ore-forming fluid was originated mainly from the deep source magmatic water, and added with atmospheric precipitation in the late stage. The δ34S value of pyrite varies from -0.7‰ to 0.6‰, indicating that the ore-forming material is mainly derived from deep magma, with the addition of stratum material. The homogenization temperature of the fluid inclusions is 155.6-304.0 ℃, and the salinity is 0.53%-13.29%, indicating that the ore-forming fluid has the characteristics of medium temperature, medium-low salinity,and rich in CO2. Based on this comprehensive study, it is believed that the genetic type of Jinkengzi gold deposit is a mesothermal vein-type gold deposit formed in the Late Indosinian period.

Key words: geochemistry, fluid inclusion, stable isotopes, genesis of ore deposit, mesothermal vein-typed deposit, Jinkengzi gold deposit, southern sub-belt of west Qinling metallogenic belt

中图分类号: 

  • P618.51
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