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Gold Science and Technology ›› 2021, Vol. 29 ›› Issue (1): 53-63.doi: 10.11872/j.issn.1005-2518.2021.01.182

• Mineral Exploration and Resource Evaluation • Previous Articles     Next Articles

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

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

CLC Number: 

  • P618.51

Fig.1

Geological and mineral map of Nibao gold deposit and its surrounding area(modified after Dai et al.,2015;Tan et al.,2017;Tao et al.,2018)"

Table 1

Comparative statistics of Au,As,Sb,Hg,W element parameters between soil geochemistry and tectonic geochemistry"

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

Fig.2

Comparision map of soil geochemistry(a)and tectonic geochemistry(b)of gold in the periphery of Nibao gold deposit"

Fig. 3

Comprehensive anomalies of Au,As,Sb,Hg and W in tectono-geochemical samples in the periphery of the Nibao gold deposit"

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