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黄金科学技术 ›› 2021, Vol. 29 ›› Issue (1): 53-63.doi: 10.11872/j.issn.1005-2518.2021.01.182

• 矿产勘查与资源评价 • 上一篇    下一篇

黔西南卡林型金矿聚集区构造地球化学弱矿化信息提取方法及其应用研究

李松涛1,2,3(),刘建中3,4(),夏勇5,谢卓君5,谭亲平5,王泽鹏2,3,周光红1,杨成富2,3,蒙明华2,谭礼金2,汪小勇2,李俊海2,3,徐良易2,王大富2   

  1. 1.贵州师范学院地理与资源学院,贵州 贵阳 550018
    2.贵州省地质矿产勘查开发局105地质大队,贵州 贵阳 550018
    3.自然资源部基岩区矿产资源勘查工程技术创新中心,贵州 贵阳 550081
    4.贵州省地质矿产勘查开发局,贵州 贵阳 550004
    5.中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州 贵阳 550081
  • 收稿日期:2020-10-10 修回日期:2020-11-14 出版日期:2021-02-28 发布日期:2021-03-22
  • 通讯作者: 刘建中 E-mail:lisongtaozgh@163.com;2585364825@qq.com
  • 作者简介:李松涛(1987-),男,四川巴中人,副教授,从事卡林型金矿成矿规律与找矿预测研究工作。lisongtaozgh@163.com
  • 基金资助:
    国家自然科学基金项目“我国西南(贵州)喀斯特地区特色矿产成矿理论及综合利用”(U1812402);国家重点研发计划项目“深地资源勘查开采”(2017YFC0601500);贵州省科技厅项目“华南陡山沱组盖帽碳酸盐岩中保留的古喀斯特结构研究”(黔科合平台人才[2018]5778-04)

Tectono-geochemistry Weak Mineralization Information Extraction Method and Its Application in the Carlin-type Gold Accumulation Area of South-western Guizhou

Songtao LI1,2,3(),Jianzhong LIU3,4(),Yong XIA5,Zhuojun XIE5,Qinping TAN5,Zepeng WANG2,3,Guanghong ZHOU1,Chengfu YANG2,3,Minghua MENG2,Lijin TAN2,Xiaoyong WANG2,Junhai LI2,3,Liangyi XU2,Dafu WANG2   

  1. 1.School of Geography and Resources,Guizhou Education University,Guiyang 550018,Guizhou,China
    2.105 Geological Team,Guizhou Geology and Mineral Bureau,Guiyang 550018,Guizhou,China
    3.Technology Innovation Center of Mineral Resources Explorations in Bedrock Zones,Ministry of Natural Resources,Guiyang 550081,Guizhou,China
    4.Bureau of Geology and Mineral Exploration and Development Guizhou Province,Guiyang 550004,Guizhou,China
    5.State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,Guizhou,China
  • Received:2020-10-10 Revised:2020-11-14 Online:2021-02-28 Published:2021-03-22
  • Contact: Jianzhong LIU E-mail:lisongtaozgh@163.com;2585364825@qq.com

摘要:

黔西南卡林型金矿聚集区作为滇黔桂“金三角”最重要的组成部分,其深部和外围找矿工作面临窘境。为突破传统化探找矿方法在深部矿产资源探寻中的难点,本研究选择泥堡金矿床外围区域进行1∶5万土壤地球化学和1∶5万构造地球化学弱信息提取对比研究。研究结果表明:构造地球化学方法能更有效地提取深部弱矿化信息,同时具有经济、实用且高效的特点。基于地质和构造地球化学特征,在研究区圈定4个综合异常,对成矿条件较好的Ⅱ号异常进行工程验证,取得了显著找矿成果。综合地质与化探研究成果认为,构造地球化学弱信息提取方法对泥堡金矿外围的找矿工作具有很好的指导作用,为研究区开展深部找矿工作提供了科学依据;经过进一步完善和推广应用,该方法可望在黔西南卡林型金矿找矿方面发挥重要作用。

关键词: 构造地球化学, 土壤地球化学, 卡林型金矿, 弱矿化信息, 泥堡金矿床, 黔西南

Abstract:

The southwestern Guizhou gold ore concentration area is one of the most important parts of the Yunnan-Guizhou-Guangxi “golden triangle” in southwestern China,its deep and peripheral prospecting work is facing a dilemma.At present,traditional geochemical methods face great challenges in the exploration of deep hydrothermal minerals (such as carlin-type gold deposits in southwest Guizhou).In order to break through the difficulties of traditional geochemical prospecting methods in the exploration of deep mineral resources,the peripheral area of Nibao gold deposit was selected for a comparative study on the extraction of weak information of 1∶50 000 soil geochemistry and 1∶50 000 tectono-geochemistry.Through the comparative study of soil geochemical survey in the same region,it is found that the method of extracting weak information of tectono-geochemistry has the following characteristics:(1) The anomaly has good reproducibility,within the range of anomalies delineated by soil geochemistry,the extraction of weak information of tectono-geochemistry can also delineate anomalies.(2)The details are more obvious,and the anomaly area obtained by the extraction of tectono-geochemical weak information is larger in the area of soil geochemical anomalies,which can obviously magnify the “high,large and complete” anomalies and strengthen some anomalies.(3)The value of high value point increases exponentially,and the highest content of Au obtained from the weak information of tectono-geochemistry is tens of times higher than that of soil geochemistry,which can highlight the high anomaly.(4)The extraction of weak information is more effective and can form anomalies in the areas where the soil geochemical survey does not show anomalies,indicating that this method plays a good role in the extraction of weak mineralization information and the location and prediction of concealed deposits.(5)The number of tectono-geochemical weak information samples is only 60% of that of the same scale soil samples,the sampling intensity is significantly reduced,and the economy is prominent.In conclusion,the results show that the tectono-geochemistry is not only more effective to extract the weak mineralization information,but also has the characteristics of economy,practicality and efficient.According to the characteristics of geology and tectono-geochemistry,four comprehensive anomalies are delineated.Through the engineering verification of No.2 anomaly with better metallogenic conditions,the remarkable prospecting results have been obtained. Com-prehensive results of geology and geochemistry in the study area show that the tectono-geochemistry weak information extraction provides a scientific basis for deep prospecting in the periphery of Nibao gold deposit. After further improvement and application,tectono-geochemical weak information extraction methods is expected to play an important role in prospecting for carlin-type gold deposits in southwestern Guizhou.

Key words: tectono-geochemistry, soil geochemistry, carlin-type gold deposit, weak mineralization infor-mation, Nibao gold deposit, southwestern Guizhou

中图分类号: 

  • P618.51

图1

泥堡金矿及其外围区域地质矿产图(据戴传固等,2015;谭礼金等,2017;陶平等,2018修改)"

表1

土壤地球化学和构造地球化学的Au、As、Sb、Hg、W元素参数对比统计"

样品类型及数量元素含量最小值含量最大值含量平均值标准偏差变化系数富集系数
土壤地球化样品(1635件样品)Au0.32922.92124.112.37
As0.7412 73678.413594.5815.08
Sb0.234 83915.631298.252.40
Hg0.0233.30.4712.130.04
W0.4868.22.4631.222.05
构造地球化学样品(936件样品)Au0.12 6707.429212.406.03
As0.221 948226.691 0464.6143.59
Sb0.052 57126.211505.724.03
Hg0.0155.10.4836.250.04
W0.014643.06175.562.55

图2

泥堡金矿外围地区金的土壤地球化学(a)与构造地球化学(b)对比图"

图3

泥堡金矿外围地区构造地球化学样品Au、As、Sb、Hg和W综合异常1.第四系;2.古近系石脑组;3.三叠系关岭组;4.三叠系永宁镇组;5.三叠系飞仙关组;6.二叠系长兴组+大隆组;7.二叠系龙潭组;8.二叠系峨眉山玄武岩组;9二叠系茅口组;10.构造蚀变体;11.地层界线;12.正断层/逆断层;13.性质不明断层;14.向斜轴/背斜轴;15.综合异常范围及编号;16.探槽"

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