本溪—集安地区三维地质综合地球物理研究
发布时间：2018-08-12 13:44
【摘要】：辽东-吉南成矿带是中国地调局确定的全国十九个重点成矿区带之一，而本溪-集安地区为辽东-吉南成矿带一部分。该区由两个地质构造单元构成，一是龙岗地块，由太古代变质岩组成，其控矿作用显著，是本区重要的含矿建造，主要矿产有铁、黄铁矿、铜（锌）、金等；二是元古代辽吉古裂谷带，其内矿产资源十分丰富，如铅锌、硼、钴、铁、金、铀、菱镁矿、滑石、等形成许多还是大型或超大型矿床。因此查明本溪-集安地区三维地质结构对于寻找隐伏矿体和研究辽吉古裂谷演化模式具有重要意义。 本文首先分析了区域地质与地球物理特征，然后设计并完成了11条综合地球物理剖面及相关物性采集工作，通过统计和分析采集标本的密度、磁化率和电阻率三种物性资料，，又进一步对各条综合地球物理剖面的数据进行了处理与交叉梯度联合反演，结合地质与地球物理资料及物性资料，对各剖面进行了综合地质-地球物理解释，获得了如下结论：1、剖面上各地球物理结构单元与地表构造单元的划分基本一致，区域主干断裂在剖面上基本表现为密度、电性梯度带和磁性分界面。龙岗地块地球物理特征主要表现为“三高”，即布格重力异常值高、磁性高、电阻率值高。辽古吉裂谷内部辽河群主地球物理特征为中高密度、低磁或无磁性、低电阻率。辽吉花岗岩主要表现为中等密度、略有磁性、中等电阻率，而中生代岩体则主要表现为中低密度、中高磁性或无磁性、高电阻率。2、区域主干断裂的地球物理特征主要表现为密集的梯度带；3、以综合地球物理方法厘定龙岗地块与辽吉古裂谷的北部边界问题，即两个地质单元在研究区范围内自西向东以草河口断裂带--连山关岩体南侧-八里甸子岩体-桓仁县红庙子乡一线为边界；4、初步构建了研究区中主要地层、岩体的三维地质结构模型。
[Abstract]:The Liaodong-Jinan metallogenic belt is one of the 19 key metallogenic belts determined by the China Geological Survey Bureau, while Benxi Ji'an area is part of the Liaodong-Jinan metallogenic belt. The area is composed of two geological tectonic units. One is the Longgang block, which is composed of Archean metamorphic rocks, which is an important ore-bearing formation in this area. The main minerals are iron, pyrite, copper (zinc), gold and so on. The other is the Proterozoic Liaojigu rift belt, which is rich in mineral resources, such as lead-zinc, boron, cobalt, iron, gold, uranium, magnesite, talc, etc. Therefore, it is important to find out the 3D geological structure of Benxi-Ji'an area for searching for concealed orebodies and studying the evolution model of Liaojiguo rift. In this paper, the characteristics of regional geology and geophysics are analyzed, then 11 integrated geophysical profiles and related physical properties are designed and completed. The data of density, magnetic susceptibility and resistivity are analyzed and analyzed. Furthermore, the data of each integrated geophysical profile are processed and the cross-gradient joint inversion is carried out. Combined with geological and geophysical data and physical data, the integrated geo-geophysical interpretation of each section is carried out. The following conclusions are obtained: 1. The division of the geophysical structural units and the surface tectonic units in the profile is basically consistent with that of the surface tectonic units. The main faults in the section are basically densities, electrical gradient zones and magnetic interfaces. The geophysical characteristics of Longgang block are mainly "three heights", that is, the Bouguer gravity anomaly value is high, the magnetic value is high, and the resistivity value is high. The main geophysical characteristics of the Liaohe Group in the LiaoGuji rift are medium and high density, low magnetic or non-magnetic, and low resistivity. Liaoji granites are mainly medium density, slightly magnetic, medium resistivity, while Mesozoic granites are mainly medium density, medium high magnetic or non-magnetic. The geophysical characteristics of the main faults in the region are mainly characterized by a dense gradient belt. The northern boundary between the Longgang block and the Liaojigugu rift is determined by a comprehensive geophysical method. That is, from west to east, the two geological units are bounded by the southern side of the Caohekou fault belt-Lianshanguan rock body-Pali Dianzi rock body-Huanren county Hongmiaozi township line. The main strata in the study area have been preliminarily constructed. Three-dimensional geological structure model of rock mass.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631
本文编号：2179235
[Abstract]:The Liaodong-Jinan metallogenic belt is one of the 19 key metallogenic belts determined by the China Geological Survey Bureau, while Benxi Ji'an area is part of the Liaodong-Jinan metallogenic belt. The area is composed of two geological tectonic units. One is the Longgang block, which is composed of Archean metamorphic rocks, which is an important ore-bearing formation in this area. The main minerals are iron, pyrite, copper (zinc), gold and so on. The other is the Proterozoic Liaojigu rift belt, which is rich in mineral resources, such as lead-zinc, boron, cobalt, iron, gold, uranium, magnesite, talc, etc. Therefore, it is important to find out the 3D geological structure of Benxi-Ji'an area for searching for concealed orebodies and studying the evolution model of Liaojiguo rift. In this paper, the characteristics of regional geology and geophysics are analyzed, then 11 integrated geophysical profiles and related physical properties are designed and completed. The data of density, magnetic susceptibility and resistivity are analyzed and analyzed. Furthermore, the data of each integrated geophysical profile are processed and the cross-gradient joint inversion is carried out. Combined with geological and geophysical data and physical data, the integrated geo-geophysical interpretation of each section is carried out. The following conclusions are obtained: 1. The division of the geophysical structural units and the surface tectonic units in the profile is basically consistent with that of the surface tectonic units. The main faults in the section are basically densities, electrical gradient zones and magnetic interfaces. The geophysical characteristics of Longgang block are mainly "three heights", that is, the Bouguer gravity anomaly value is high, the magnetic value is high, and the resistivity value is high. The main geophysical characteristics of the Liaohe Group in the LiaoGuji rift are medium and high density, low magnetic or non-magnetic, and low resistivity. Liaoji granites are mainly medium density, slightly magnetic, medium resistivity, while Mesozoic granites are mainly medium density, medium high magnetic or non-magnetic. The geophysical characteristics of the main faults in the region are mainly characterized by a dense gradient belt. The northern boundary between the Longgang block and the Liaojigugu rift is determined by a comprehensive geophysical method. That is, from west to east, the two geological units are bounded by the southern side of the Caohekou fault belt-Lianshanguan rock body-Pali Dianzi rock body-Huanren county Hongmiaozi township line. The main strata in the study area have been preliminarily constructed. Three-dimensional geological structure model of rock mass.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631
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