【摘要】：本溪地區(qū)鐵礦資源豐富，但歷經(jīng)多年開采，地表及淺層的鐵礦資源逐步減少，開展本溪地區(qū)深部地質(zhì)結(jié)構(gòu)研究，尋找隱伏含鐵建造和深部鐵礦的任務日趨緊迫。本文在區(qū)域地質(zhì)和地球物理資料的基礎上，開展了磁化率三維反演、三維地質(zhì)建模方法及鐵礦體三維建模等方面的研究工作，結(jié)合鉆孔數(shù)據(jù)，通過三維磁化率反演揭示了大臺溝鐵礦體和思山嶺鐵礦的三維幾何形態(tài)，構(gòu)建了大臺溝鐵礦和思山嶺鐵礦體的三維幾何形態(tài)模型。思山嶺鐵礦體的三維幾何形態(tài)總體呈向上彎曲狀，礦體底界最大埋深為1560米，總體走向為北西向，在北西方向有一個延伸的磁性體。大臺溝鐵礦磁性體的三維幾何形態(tài)呈保齡球狀，總體走向為北西向，傾向南西，近乎直立，沿走向長約5公里。磁性體中部隆起，向北西和南東方向傾伏，，寬度變化范圍為600-1200m，磁性體寬度超過1100m的磁性體頂界埋藏深度界于1100米至1200米之間，底界埋深約為4400米。磁性體的走向、傾向以及寬度均與鉆孔資料相符。 褶皺和韌性剪切作用是控制鐵礦體三維幾何形態(tài)的兩個主要因素。思山嶺鐵礦體呈“元寶”狀，其形態(tài)主要受褶皺構(gòu)造所控制；大臺溝鐵礦呈“板狀”三維幾何形態(tài)，推測其形態(tài)主要受韌性剪切作用控制。隆升剝蝕、巖漿侵入對鐵礦體的三維幾何形態(tài)起破壞與改造作用。
[Abstract]:Benxi area is rich in iron ore resources, but after many years of mining, surface and shallow iron ore resources are gradually reduced. It is increasingly urgent to study the deep geological structure of Benxi area and to find hidden iron-bearing formations and deep iron ores. On the basis of the regional geological and geophysical data, this paper has carried out the research work of 3D inversion of magnetic susceptibility, 3D geological modeling method and 3D modeling of iron ore body, combined with borehole data. The 3D geometry of Datingou iron ore body and sishanling iron ore body is revealed by 3D magnetic susceptibility inversion, and the 3D geometry model of Datingou iron ore body and sishanling iron ore body is constructed. The 3D geometry of the Sishanling iron ore body is generally curved upward, the maximum buried depth of the bottom boundary of the ore body is 1560 meters, the overall strike is NW, and there is an extended magnetic body in the NW direction. The 3D geometry of the magnetic body of Datingou Iron Mine is bowling ball shape, with a general strike of NW and a tendency to the southwest, which is nearly upright, and is about 5 km long along the strike. The central part of the magnetic body is uplifted and tilted northwestward and southeast.The width varies from 600m to 1200 m. The buried depth of the top boundary of the magnetic body over 1100m is between 1100 and 1200 meters, and the depth of the bottom boundary is about 4400 meters. The direction, tendency and width of the magnetic body are consistent with the borehole data. Fold and ductile shear are two main factors controlling the 3D geometry of iron ore body. The shape of Sishanling iron ore body is "Yuanbao", the shape of which is mainly controlled by fold structure, and that of Datingou iron deposit is "plate-like" three-dimensional geometry, which is mainly controlled by ductile shear. Uplift and denudation and magmatic intrusion destroy and reconstruct the three-dimensional geometry of iron ore body.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.31;P628.3

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