地质科技通报 (Mar 2021)
Indication of elements geochemical characteristics of stream sediment to evaluation of regional denudation degree: A case study of the Dachang gold ore field in east Kunlun, Qinghai Province
Abstract
Using the elements geochemical characteristics in stream sediments survey, have the advantages of yofast, effective and low cost in different scale evaluation of denudation degree in Dachang gold ore field in east Kunlun, Qinghai Province.It also provides strong support for evaluating the regional metallogenic potential.We take a case study of the data of 1∶50 000 stream sediments survey in the Dachang gold ore field for processing and analysis, which is based on the theory of hydrothermal percolation halo banding, and the spatial zoning of the primary halo and the structural similarity with secondary anomalies of gold deposits in the area.Besides, we build the element association and elemental banding sequence with common features between the common mineralization element dispersed train and the primary halo.Three methods, including the elemental ratio method, the triangular graphic method and the elemental banding sequence method are used to set up the evaluation parameters of regional denudation degree.Finally, combined with the characteristics of the geology and mineral resources in the field, the denudation degree of 7 anomalous areas in the Dachang gold ore field and surrounding areas is evaluated, and it is believed that the denudation degree of Zalayibei, Geyonggongma, Dongda Hariwula, and Zhaodaebei areas is higher; the degree of denudation in the Dexiran area is medium; the degree of denudation in the Zarayi-Dachang and Zhaodaenan areas is lower.Meanwhile, it is believed that the use of the elemental geochemical characteristics of stream sediments and the combined use of multiple evaluation indicators can effectively and quickly carry out a moderate evaluation of the degree of regional denudation, provide support for the evaluation of mineralization potential, and have very important indications for prospecting and exploration.
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