基于MRAS证据权重模型的河南老湾地区金矿成矿预测

doi:10.11720/wtyht.2022.1337

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Abstract

The Laowan area in Henan Province is an important gold minerogenetic area in the Tongbai-Dabie noble nonferrous metal metallogenic belt. Based on the comprehensive analysis of the metallogenic factors of the area, the authors extracted and established nine predictive variables, i.e., strata, ductile shear zones, brittle fault zones, magmatic rocks, gold-related alteration zones, and single-element anomalies of gold, arsenic, antimony, and sliver in stream sediments. Then, the authors predicted metallogenic prospect areas of gold in this area using the weight of evidence model and the MRAS software. Grid cells with a size of 0.10 km×0.10 km were used for prediction, and they were divided into classes A, B, and C in terms of prospecting prediction through the prior probability calculation, weight statistics, independence tests, and posterior probability calculation of each prediction variable. Based on the distribution characteristics of various classes of prediction grid cells and the geological characteristics of gold deposits in the study area, this study delineated four first- and four second-order prospecting target areas. According to comprehensive analysis, most of the known gold deposits or gold ore occurrences fall into the prediction blocks of classes A and B and the prediction blocks of class C lie around the prediction blocks of classes A or B. This analytical result is consistent with the gradual changes of the metallogenic belt from the center to the edges. Gold deposits or ore occurrences have been discovered in all the delineated first-order prospecting target areas, and the posterior probabilities have a high average. Therefore, first-order prospecting target areas have great gold prospecting potential.

Key words： MRAS weight of evidence model gold deposit metallogenic prediction Laowan area,Henan Province

Received: 11 June 2021 Published: 21 June 2022

ZTFLH:

P632

Corresponding Authors: CHEN Jian-Li E-mail: weicongling@126.com;842186572@qq.com

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	Cong-Ling WEI
	Jian-Li CHEN
	Peng GUO

Cite this article:

Cong-Ling WEI,Jian-Li CHEN,Peng GUO. Metallogenic prediction of gold deposits in Laowan area, Henan Province using the weight of evidence model and MRAS[J]. Geophysical and Geochemical Exploration, 2022, 46(3): 653-660.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1337 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I3/653

Region geological map of Laowan Gold Belt

Variable map of metallogenic prediction in Laowan Gold Belt

Prior probability statistical results of predictive variables in the area

Weight of evidence statistical results of predictive variables in the area

Independence test results of predictive variables in the area

Distribution of posterior probability’s cumulative frequency

Histogram of posterior probability distribution of prediction unit

Metallogenic prognosis map of gold deposit in Laowan area

Prospecting target areas of gold in Laowan area

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