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现代地质 ›› 2021, Vol. 35 ›› Issue (02): 579-588.DOI: 10.19657/j.geoscience.1000-8527.2020.070

• 岩石学 • 上一篇    

甘肃岗岔—克莫地区蚀变岩特征与找矿预测

王书豪1(), 申俊峰1(), 彭自栋2, 徐立为3, 牛刚4, 刘海明5, 李金春6, 杜佰松1, 刘家军1   

  1. 1.中国地质大学(北京) 地球科学与资源学院,北京 100083
    2.中国科学院 地质与地球物理研究所,北京 100029
    3.北京金有地质勘查有限责任公司,北京 100011
    4.甘肃鼎丰矿业有限责任公司,甘肃 兰州 730000
    5.拉瓦尔大学 地质与地质工程系,魁北克 拉瓦尔 G1V0A6
    6.合作合力矿业有限公司,甘肃 合作 747000
  • 收稿日期:2019-07-10 修回日期:2020-09-01 出版日期:2021-04-25 发布日期:2021-05-25
  • 通讯作者: 申俊峰
  • 作者简介:申俊峰,男,教授,博士生导师,1962年出生,矿物学、岩石学、矿床学专业,主要从事成因矿物学与找矿矿物学的教学和研究工作。Email: shenjf@cugb.edu.cn
    王书豪,男,硕士研究生,1993年出生,矿物学、岩石学、矿床学专业,主要从事成因矿物学与找矿矿物学的研究工作。Email: shuhao_wang@163.com
  • 基金资助:
    国家自然科学基金重点项目(41730426)

Altered Rock Characteristics and Gold Prospecting of Gangcha-Kemo Area in Gansu Province

WANG Shuhao1(), SHEN Junfeng1(), PENG Zidong2, XU Liwei3, NIU Gang4, LIU Haiming5, LI Jinchun6, DU Baisong1, LIU Jiajun1   

  1. 1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
    2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    3. Beijing Gold Geological Exploration Co. Ltd., Beijing 100011, China
    4. Gansu Dingfeng Mining Co. Ltd., Lanzhou, Gansu 730000, China
    5. Department of Geology and Geological Engineering,Université Laval, Laval, Quebec G1V0A6, Canada
    6. Hezuo Heli Mining Co. Ltd., Hezuo, Gansu 747000, China
  • Received:2019-07-10 Revised:2020-09-01 Online:2021-04-25 Published:2021-05-25
  • Contact: SHEN Junfeng

摘要:

岗岔—克莫金矿区位于西秦岭北缘夏河—合作成矿带,具浅成低温热液型矿床特征,初步显示深部可能具有斑岩成矿系统存在。利用短波红外光谱矿物分析技术对岗岔—克莫金矿区蚀变岩特征的研究表明,矿区内发育的蚀变矿物主要有白云母、伊利石、蒙脱石、高岭石、地开石、绿泥石、绿帘石和次生石英等。近矿蚀变类型主要为绢英岩化。矿区内以下家门沟口为中心向外依次发育了中心带(绢英岩化带)、过渡带(泥化带)和外围带(青磐岩化带)。此外,伊利石结晶度以下家门沟口为中心向外具有明显的降低趋势。研究结果指示下家门沟口可能是矿区的热液活动中心。

关键词: 短波红外光谱, 蚀变矿物, 伊利石结晶度, 找矿预测, 岗岔—克莫金矿

Abstract:

The Gangcha-Kemo gold deposit in the Xiahe-Hezuo region is located on the northern margin of the west Qinling orogen. The deposit is of epithermal type with possible occurrence of deeper porphyry mineralization system. We studied the rock alteration features of the gold deposit with the short-wave infrared spectral (SWIR) mineral analysis technique. The results indicate that local alteration minerals include mainly muscovite, illite, montmorillonite, kaolinite, dickite, chlorite, epidote and quartz. Phyllic alteration is developed mainly around the orebody. The central phyllic zone, transitional argillic zone, and the peripheral propylitic zone are developed successively away from the Xiajiamengoukou area. Besides, illite crystallinity has shown obvious decreasing trend outward from Xiajiamengoukou. This shows that Xiajiamengoukou likely represents the hydrothermal center.

Key words: short-wave infrared spectroscopy (SWIR), alteration mineral, illite crystallinity, prospecting, Gangcha-Kemo gold deposit

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