内蒙古东南部双尖子山矿区三维磁性结构及地质构造特征

双尖子山银铅锌矿位于大兴安岭中南段，是近年来该区域新发现的规模最大的银多金属矿，属热液型矿床并经历了多次矿化叠加。磁异常与金属矿有较强的相关性，磁性结构能够较好地反映控矿构造。本研究在各类先验信息约束下，对双尖子山铅锌矿区约1200 km²的高精度磁法数据进行了定性分析，并通过三维物性反演计算，得到了该区域地下5 km内的三维磁性结构，初步揭示了深部构造特征。获得的认识如下：(1)研究区高磁性岩体主要分布在中部和西北部，呈北东—南西向条带状展布。(2)基于磁性结构，将研究区划分为4个主要构造单元和6个次级构造单元；(3)研究区总体断裂构造呈北东—南西走向，南部断裂构造转为北西—南东走向；(4)研究区中部和东南部有较大范围的隐伏岩浆岩，且以中酸性岩浆岩为主。

Three-dimensional Magnetic Structure and Geological Structural Characteristics of Shuangjianzishan in Southeastern Inner Mongolia

The Shuangjianzishan Ag-Pb-Zn deposit, located in the middle-southern section of the Great Xing'an Range, is the largest silver-polymetallic deposit discovered in the region in recent years. It is a hydrothermal deposit that has undergone multistage mineralization. Magnetic anomaly has a strong correlation with mineralization, and the magnetic structure can well reflect the ore-controlling structures. In this study, building on various existing information, a three-dimensional inversion of high-precision magnetic data of about 1200 square kilometers in the study area is carried out, and the local three-dimensional magnetic structure within 5 km is obtained. The main conclusions are: (1) The high magnetic intrusion is mainly distributed in the middle and northwest, and shows a NE-SW-elongated distribution; (2) The study area comprises four major structural units and six sub-structural units; (3) The overall local fault structure shows as a NE-SW trend, and the southern fault structure changes to NW-SE trending; (4) There are various concealed magmatic rock units in the central and southeastern parts of the study area, which are mainly intermediate-felsic igneous rocks.