Exploration of Metallogenic Structure of Manganese Ore Using Magnetotelluric Method: A Case Study in Minle Region, Hunan Province, China

IF 4.8 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Natural Resources Research Pub Date : 2024-07-22 DOI:10.1007/s11053-024-10376-8

Yang Yang, Lili Ye, Fangbo Chen, Sanxi Peng, Huimei Shan

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Abstract

The Minle manganese (Mn) deposit is a typical Mn-bearing deposit in the Datangpo Formation in southern China. The metallogenic environment and associated changing processes directly determine the migration, enrichment, and precipitation of Mn. To have a better understanding of the metallogenic structure, magnetotelluric (MT) method was performed to explore the Minle deposit. Electrical spindle analysis of MT data was conducted based on the Swift decomposition and the phase tensor decomposition, and inversion of the transverse-electric (TE) and transverse-magnetic (TM) models was carried out using the Occam inversion method. The results revealed that the main structural strike of the MT section was approximately 37° north to east and obtained the distribution characteristics of the deep electrical properties in the study area. The “concave structure” in the resistivity model is the main geophysical marker for delineating the Mn-ore body. In the metallogenic structure of Mn ore, a “funnel-shaped structure” of the strata was found, which provided favorable space for the percolation and enrichment of Mn deposits. The results of this study will be helpful in improving geophysical prospecting techniques for sedimentary Mn deposits in southern China.

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利用磁法探测锰矿的成矿构造：中国湖南省民乐地区案例研究

民乐锰（Mn）矿床是中国南部大塘坡地层中一个典型的含锰矿床。成矿环境及相关变化过程直接决定了锰的迁移、富集和沉淀。为了更好地了解矿床的成矿构造，对民乐矿床进行了磁法（MT）勘探。根据斯威夫特分解和相张量分解对 MT 数据进行了电主轴分析，并利用奥卡姆反演法对横向电（TE）和横向磁（TM）模型进行了反演。结果表明，MT 断面的主要构造走向约为北至东 37°，并获得了研究区深部电性的分布特征。电阻率模型中的 "凹陷结构 "是划分锰矿体的主要地球物理标志。在锰矿的成矿构造中，发现地层呈 "漏斗状构造"，为锰矿床的渗流和富集提供了有利空间。该研究成果将有助于提高中国南方沉积锰矿床的地球物理勘探技术。

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来源期刊

Natural Resources Research Environmental Science-General Environmental Science

CiteScore

11.90

自引率

11.10%

发文量

151

期刊介绍： This journal publishes quantitative studies of natural (mainly but not limited to mineral) resources exploration, evaluation and exploitation, including environmental and risk-related aspects. Typical articles use geoscientific data or analyses to assess, test, or compare resource-related aspects. NRR covers a wide variety of resources including minerals, coal, hydrocarbon, geothermal, water, and vegetation. Case studies are welcome.