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Gold Science and Technology ›› 2022, Vol. 30 ›› Issue (4): 532-539.doi: 10.11872/j.issn.1005-2518.2022.04.126

• Mineral Exploration and Resource Evaluation • Previous Articles    

Discriminant Index and Significance of Structural Body Alteration of Carlin-type Gold Deposits in Yunnan-Guizhou-Guangxi and Its Surrounding Areas，China

Jianzhong LIU1,2,3(),Zepeng WANG2,4,Chengfu YANG2,4,Junhai LI2,4,Lulin ZHENG3,Fa’en Chen4,Qinping TAN5,Zhuojun XIE5,Weifang SONG6,3,Liangyi XU4,Songtao LI2,4,Dafu WANG4,Yongjun QIN1,2,Yuhong YANG2,7,Xiaoyong WANG4   

  1. 1.Guizhou Provincial Bureau of Geology and Mineral Resources，Guiyang 550004，Guizhou，China
    2.Technology Innovation Center of Mineral Resources Explorations in Bedrock Zones，Ministry of Natural Resources of the People’s Republic of China，Guiyang 550081，Guizhou，China
    3.Guizhou University，Guiyang 550025，Guizhou，China
    4.Guizhou Geology and Mineral Bureau 105 Geological Team，Guiyang 550018，Guizhou，China
    5.Institute of Geochemistry，Chinese Academy of Sciences，Guiyang 550081，Guizhou，China
    6.Six Geological Team of Hubei Geological Burea，Xiaogan 432000，Hubei，China
    7.Guizhou Provincial Bureau of Land and Mineral Resources Reserves，Guiyang 550004，Guizhou，China
  • Received:2020-12-06 Revised:2022-09-15 Online:2022-08-31 Published:2022-10-31

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Abstract:

The Yunnan-Guizhou-Guangxi area and its surrounding area in China are the carlin-type gold deposit producing areas，which is one of the most important gold resources producing areas in China.Based on the study and prospecting practice of gold deposits in southwest Guizhou，the structural body alteration （SBT） is expanded，its discriminant index was established，and the relationship between regional mineralization and prospecting space was briefly described.The results show that structural body alteration is the product of mineralization and occurs between the unconformity surface and lithologic layer interface where the rock capacity varies greatly.Based on the structural body alteration of regional multi-level output，the multi-level structural detachment metallogenic system of carlin-type gold deposits in Yunnan-Guizhou-Guangxi area is constructed，which lays the foundation for the systematic study of regional carlin-type gold deposits.It is of great significance to establish the discriminant index and identify the structural body alteration accurately for the metallogenic prediction and prospecting of carlin-type gold deposits in Yunnan-Guizhou-Guangxi and its surrounding areas.

Key words: structural body alteration（SBT）, carlin-type gold deposit, metallogenic system, discriminant index, Yunnan-Guizhou-Guangxi area

CLC Number: 

  • P618.51

Fig.1

Geotectonic map of carlin-type gold deposit in Yunnan-Guizhou-Guangxi and its surrounding areas in China（Liu et al.，2015）"

Fig.2

Schematic diagram of structural body alteration（SBT） in the Triassic platform facies area of southwest Guizhou（Liu et al.，2017a）"

Fig.3

Schematic diagram of multi-level tectonic detachment metallogenic system of carlin-type gold deposits in Yunnan，Guizhou，Guangxi and adjacent areas（modified after Liu et al.，2017b，2020，2021）"

Table 1

Discriminant indexes of structural body alteration（SBT） of carlin-type gold deposits in Yunnan，Guizhou，Guangxi and surrounding areas"

判别指标主要特征典型矿床
产出背景南盘江—右江成矿区
产出形态层状，与地层产状一致
构造部位背斜水银洞、泥堡、卡务、大麦地、架底、紫木凼、老寨湾、隆或
穹窿戈塘、高龙、板其、马雄、那郎
构造面不整合面（角度不整合面、平行不整合面）革档、马雄、巴平、老寨湾、隆或、水银洞、紫木凼、戈塘、泥堡、架底、大麦地、堂上、板其、大观、高龙
能干性差异较大的岩性层面卡务、风堡、浪全、平桥
构造特征滑脱构造
变形特征角砾+碎裂+滑动+揉皱+褶皱
岩石特征角砾岩+碎裂岩
蚀变特征硅化+黄铁矿化+毒砂化+萤石化+雄（雌）黄化+辉锑矿化
元素组合Au-As-Sb-Hg-Tl
层序组合泥质钙质碎屑岩系（上）+碳酸盐岩（下）水银洞、板其、卡务、大观
峨眉山玄武岩（上）+碳酸盐岩（下）架底、大麦地、堂上
界线交代作用形成的蚀变显然是由强到弱直至趋于正常，其界线为元素增减而体现，故界线起伏，难以宏观直接圈定，图面采用虚线表示
层次区域上岩石能干性差异大的D/??、D/O、C/D、T2/P1+3、P3/P2不整合面和岩石能干性差异大的P1ly/CP1n、P2-3lh/P1-2s、T2/T1岩层面形成多层次构造蚀变体（SBT），区域上多层次的构造蚀变体不等于在矿区尺度上形成多层构造蚀变体，往往一个矿区仅形成一层构造蚀变体D/??角度不整合面（革档、马雄、巴平），D1/O1角度不整合面（老寨湾），C/D平行不整合面（隆或），P3/P2平行不整合面（水银洞、紫木凼、戈塘、泥堡、架底、大麦地、、堂上），T2/P1+3平行不整合面（板其、大观、高龙、那郎），T2/T1能干性差异较大的岩性层面（风堡、浪全），P2-3lh/P1-2s（卡务），P1ly/CP1n能干性差异较大的岩性层面（平桥）
控制因素构造蚀变体的产出，不受时代和地层制约，而主要受控于岩石能干性的差异，厚度大于100 m的厚层灰岩或白云岩或礁灰岩（下）与厚度大于50 m的泥质钙质碎屑岩系或峨眉山玄武岩（凝灰岩）（上）之间往往是构造蚀变体产出的最佳部位。薄层碎屑岩与灰岩组合的沉积系统（如二叠系合山组，三叠系罗楼组），内部或与其上覆或下伏地层之间往往难以形成构造蚀变体
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