LI Z, ZHANG D H, SHEN C L, et al.Quantitative analysis of fractal and mixed distribution with geochemical data from the Bayantala-Mingantu Region，Inner Mongolia，and implications for rare metal prospecting prediction[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(6):54-63.

doi:10.16186/j.cnki.1673-9787.2021010002

Received:2021/01/02

Revised:2021/03/20

Published:2022/11/25

Quantitative analysis of fractal and mixed distribution with geochemical data from the Bayantala-Mingantu Region，Inner Mongolia，and implications for rare metal prospecting prediction

LI Zhu1, ZHANG Dehui1, SHEN Cunli2, ZHANG Rongzhen1, LI Lin2, ZHU Penglong2

1.School of Earth Sciences and Resources，China University of Geosciences（Beijing），Beijing  100083，China；2.Nonferrous Geological Bureau of Inner Mongolia，Hohhot  010010，Inner Mongolia，China

Abstract:In order to study the role of fractal and mixed distribution quantitative analysis in geochemical exploration，W，Nb，Cu，and Bi elemental data of 1 325 soil samples from the Bayantala-Mingantu area，Inner Mongolia were quantitatively analyzed by means of multi-fractal （C-A fractal） and multimodal distribution （mixed distribution） methods.Results showed that the C-A fractal analysis got a fitting line of three-step with multifractal characteristics.The mixed distribution analysis indicated that it followed a mixed distribution containing two lognormal distributions.Geochemical anomalies were delineated according to the anomalous threshold estimated by C-A fractal inflection point and mixed distribution.By comparing the geochemical anomalies obtained by these two methods，it was found that the W-Bi-（Cu） geochemical comprehensive anomalies highlighted by mixed distribution were in good agreement with the known major ore deposits or occurrences of rare metals.This indicated that multimodal distribution（mixed distribution）method might have a good application effect in the prospecting prediction of rare metals，such as Nb（Ta）and W in this area.On the basis of comprehensive anomalies and combined with geological metallogenic conditions，three prospecting and prediction target areas for rare metals were delineated.

Key words:geochemistry;- fractal;mixed distribution;rare metal;prospecting prediction

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