Tectono-geochemistry Weak Mineralization Information Extraction Method and Its Application in the Carlin-type Gold Accumulation Area of South-western Guizhou
Received date: 2020-10-10
Revised date: 2020-11-14
Online published: 2021-03-22
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.
Songtao LI , Jianzhong LIU , Yong XIA , Zhuojun XIE , Qinping TAN , Zepeng WANG , Guanghong ZHOU , Chengfu YANG , Minghua MENG , Lijin TAN , Xiaoyong WANG , Junhai LI , Liangyi XU , Dafu WANG . Tectono-geochemistry Weak Mineralization Information Extraction Method and Its Application in the Carlin-type Gold Accumulation Area of South-western Guizhou[J]. Gold Science and Technology, 2021 , 29(1) : 53 -63 . DOI: 10.11872/j.issn.1005-2518.2021.01.182
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