【摘要】：遼東-吉南成礦帶是中國地調(diào)局確定的全國十九個重點(diǎn)成礦區(qū)帶之一，而本溪-集安地區(qū)為遼東-吉南成礦帶一部分。該區(qū)由兩個地質(zhì)構(gòu)造單元構(gòu)成，一是龍崗地塊，由太古代變質(zhì)巖組成，其控礦作用顯著，是本區(qū)重要的含礦建造，主要礦產(chǎn)有鐵、黃鐵礦、銅（鋅）、金等；二是元古代遼吉古裂谷帶，其內(nèi)礦產(chǎn)資源十分豐富，如鉛鋅、硼、鈷、鐵、金、鈾、菱鎂礦、滑石、等形成許多還是大型或超大型礦床。因此查明本溪-集安地區(qū)三維地質(zhì)結(jié)構(gòu)對于尋找隱伏礦體和研究遼吉古裂谷演化模式具有重要意義。 本文首先分析了區(qū)域地質(zhì)與地球物理特征，然后設(shè)計(jì)并完成了11條綜合地球物理剖面及相關(guān)物性采集工作，通過統(tǒng)計(jì)和分析采集標(biāo)本的密度、磁化率和電阻率三種物性資料，，又進(jìn)一步對各條綜合地球物理剖面的數(shù)據(jù)進(jìn)行了處理與交叉梯度聯(lián)合反演，結(jié)合地質(zhì)與地球物理資料及物性資料，對各剖面進(jìn)行了綜合地質(zhì)-地球物理解釋，獲得了如下結(jié)論：1、剖面上各地球物理結(jié)構(gòu)單元與地表構(gòu)造單元的劃分基本一致，區(qū)域主干斷裂在剖面上基本表現(xiàn)為密度、電性梯度帶和磁性分界面。龍崗地塊地球物理特征主要表現(xiàn)為“三高”，即布格重力異常值高、磁性高、電阻率值高。遼古吉裂谷內(nèi)部遼河群主地球物理特征為中高密度、低磁或無磁性、低電阻率。遼吉花崗巖主要表現(xiàn)為中等密度、略有磁性、中等電阻率，而中生代巖體則主要表現(xiàn)為中低密度、中高磁性或無磁性、高電阻率。2、區(qū)域主干斷裂的地球物理特征主要表現(xiàn)為密集的梯度帶；3、以綜合地球物理方法厘定龍崗地塊與遼吉古裂谷的北部邊界問題，即兩個地質(zhì)單元在研究區(qū)范圍內(nèi)自西向東以草河口斷裂帶--連山關(guān)巖體南側(cè)-八里甸子巖體-桓仁縣紅廟子鄉(xiāng)一線為邊界；4、初步構(gòu)建了研究區(qū)中主要地層、巖體的三維地質(zhì)結(jié)構(gòu)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.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P631

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