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Gold Science and Technology ›› 2023, Vol. 31 ›› Issue (3): 433-442.doi: 10.11872/j.issn.1005-2518.2023.03.151

• Mineral Exploration and Resource Evaluation • Previous Articles     Next Articles

Geological Characteristics and Prospecting Prediction of Gold Deposit in Kawu Area，Zhenfeng County，Guizhou Province

Dafu WANG1(),Jianzhong LIU2,3,4(),Zepeng WANG1,3,Fa’en CHEN1,Chengfu YANG1,3,Liangyi XU1,4,Junhai LI1,3,Jingke LIU1,Qiquan PAN1,Chengxiong LONG1,Xiaoyong WANG1   

  1. 1.No. 105 Geological Team, Bureau of Geology and Mineral Exploration and Development Guizhou Province, Guiyang 550018, Guizhou, China
    2.Bureau of Geology and Mineral Exploration and Development Guizhou Province, Guiyang 550004, Guizhou, China
    3.Technology Innovation Center of Mineral Resources Explorations in Bedrock Zones, Ministry of Natural Resources, Guiyang 550081, Guizhou, China
    4.Guizhou University, Guiyang 550025, Guizhou, China
  • Received:2022-10-19 Revised:2022-12-05 Online:2023-06-30 Published:2023-07-20
  • Contact: Jianzhong LIU E-mail:748983010@qq.com;2585364825@qq.com

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Abstract:

The tectonic position of the study area belongs to the junction of the southwest edge of the Yangtze quasi platform and the Youjiang fold belt of the south China fold belt，which is an important component of carlin-type gold deposits area in southwest Guizhou.The deep hidden deposit prospecting has not made a new breakthrough.Based on the recent research on structure-controlled alteration zone （SBT） and the latest theoretical results of multi-level structural slippage metallogenic system of carlin-type gold deposits in Nanpanjiang-Youjiang area，the geological background and geological characteristics of typical deposits are studied through field investigation in the Kawu，Southwestern Guizhou，China.The results further clarified the geological characteristics of gold deposits in the Kawu area and identified the main prospecting criteria，established the core elements of gold prospecting prediction in the Kawu area，and newly identified the existence of SBT between the rock interfaces with large differences in rock competence in the area，providing an important basis for regional prospecting prediction.The gold orebody is deposited in SBT and the high-angle pressure fault and the interlayer fracture zone，system summary Kawu area gold metallogenic elements.The study shows that the regional structural detachment and interlayer fracture zone are the main channel of metallogenic fluid migration and the ore site of gold ore body，the abnormal overlap parts of the metallogenic elements such as Au，As，Sb and Hg are the most favorable parts of mineralization，which is the same metallogenic system as the regional carlin-type gold deposit，and the gold metallogenic conditions are superior.Based on the multi-level structural detachment metallogenic system and the prospecting prediction model，the prospecting prediction was carried out，3 prospecting prediction areas were delineated，the gold resources in Kawu area were predicted as 50 t，and the prospecting direction in the area is defined，so as to provide guidance and reference for the subsequent prospecting work in this area.

Key words: carlin-type gold deposit, structure alteration rocks （SBT）, ore-controlling factor, prospecting prediction, Kawu area, Guizhou Province

CLC Number: 

  • P618.51

Fig.1

Geological and mineral map of Kawu area"

Fig.2

Sectional schematic diagram of structure alteration body of the Kawu gold deposit"

Fig.3

Alteration characteristics of structure alteration body of the Kawu gold deposit"

Table 1

Metallogenic elements of gold deposits in Kawu area"

成矿要素主要特征
成矿地质体燕山期隐伏花岗岩体（110~150 Ma）
成矿构造及成矿结构面成矿构造：白层背斜、卡务背斜、包树背斜、滑脱构造以及与背斜同期形成的逆断层；成矿结构面：断裂面、背斜轴面、灰岩与黏土岩（粉砂岩）界面以及玄武岩与凝灰岩界面
结构类型“断裂+构造蚀变体（SBT）”的上、下二元结构模式
成矿作用特征标志成矿早阶段：石英—白云石阶段（玉髓+石英+白云石）；成矿主阶段：黄铁矿—毒砂阶段（黄铁矿+毒砂）；成矿晚阶段：石英—方解石阶段（方解石+石英）

Fig.4

Schematic diagram of multi-level structural detachment metallogenic system of carlin-type gold deposits in southern China（Liu et al.，2022）"

Table 2

Core elements of prospecting prediction of carlin-type gold deposits in Kawu area"

典型矿床构造构造特征构造蚀变体成矿范围
翼间角轴面倾角轴倾伏角厚度/m岩石组合
卡务金矿床卡务背斜100°~140°60°~90°5°~20°2~20

上：细碎屑岩（P2-3lh）；

下：灰岩（P1-2sd）

背斜轴附近2 000 m
新寨金矿床白层背斜100°~160°80°~90°5°~20°未发现未发现背斜轴附近1 500 m、断裂带深部延伸
典型矿床

成矿面积

/ km2

矿床规模/tSBT中矿体规模成矿背景成矿条件成矿要素地球化学特征
卡务金矿床300.26长：30~100 m；宽：20~50 m黔西南金矿集区赖子山矿田北段卡务背斜及断裂构造、SBT、岩性组合、热液蚀变Au、As、Sb、Hg
新寨金矿床152.83未发现黔西南金矿集区赖子山矿田北段白层背斜（穹隆）及断裂构造、SBT、岩性组合、热液蚀变Au、As、Sb、Hg

Table 3

Predicting areas of carlin-type gold deposits in Kawu area"

预测区

名称

预测要素面积/km2预测延深/m预测埋深/m查明金资源量/t预测潜在金资源量/t
合计644

卡务

预测区

成矿构造：卡务背斜；成矿结构面：P2-3lh/P1-2sd构造蚀变体（SBT）、断裂；赋矿地层：P2-3lh；容矿岩石：构造角砾岩、玄武质岩屑砂岩、凝灰质黏土岩、粉砂岩；矿体类型：层控为主，断控为辅；热液蚀变：硅化、黄铁矿化、毒砂化、褐铁矿化、方解石化和白云石化；已有矿床（点）：卡务；矿体埋深：100~500 m25.832 000100~500120

新寨

预测区

成矿构造：白层背斜、断裂；成矿结构面：T1-2l/P3w构造蚀变体（SBT）、断裂；赋矿地层：T1-2l、T2x和T2b；容矿岩石：构造角砾岩、钙质砂岩、钙质粉砂岩和黏土质粉砂岩；矿体类型：层控、断控；热液蚀变：硅化、黄铁矿化、褐铁矿化、方解石化、白云石化和黏土化；已有矿床（点）：新寨；矿体埋深：100~500 m14.641 800100~500510

包树

预测区

成矿构造：包树背斜；成矿结构面：T1-2l/P3w之间构造蚀变体（SBT）；赋矿地层：T1-2l；容矿岩石：钙质粉砂岩和泥灰岩；矿体类型：层控；热液蚀变：硅化、黄铁矿化、褐铁矿化和方解石化；已有矿床（点）：包树；矿体埋深：100~300 m10.661 000100~300014

Fig.5

Prediction distribution map of carlin-type gold deposits in Kawu area"

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