甘肃平川水泉—宁夏灵武红柳坑电性结构特征

发布时间：2018-01-27 01:37

本文关键词： 香山地区大地电磁测深电性结构矿产勘探　出处：《成都理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：论文利用甘肃平川水泉—宁夏灵武红柳坑大地电磁测深剖面资料,以香山地区的地质地球物理结构为背景,建立了香山地区的深部电性结构,结合地球物理、地质资料,探讨了沿剖面各深大断裂带在深部的延伸情况和各构造单元边界带,揭示了沿剖面的鄂尔多斯西缘隆褶带、卫宁北山—罗山坳陷带、中卫—同心断裂带、香山隆褶带、兴仁—海原坳陷带及西华山—六盘山隆褶带30千米深度的电性结构特征及相互关系,结合香山地区的相关资料,预测成矿远景区。主要成果包括:(1)结合研究区已有地质、地球物理及物性测试资料,针对矿产评价等任务,梳理了本次物探工作的主要探测对象:香山逆冲推覆体、高阻岩体、滑脱面及典型断层,建立了单独探测对象的地电断面模型及实测剖面深部粗结构地电断面模型,开展了大地电磁正演模拟及反演计算,模拟结果表明MT方法能有效探测研究区典型地质构造。(2)对张量阻抗资料进行处理分析,得到了研究区的二维偏离度,反映测区以二维构造为主;利用阻抗张量分解方法获得沿剖面方向不同构造单元的构造走向或者倾向(最佳方位角),测区最佳方位角与电极布置方向呈22.5度夹角,并依据最佳方位角对阻抗进行了旋转校正。(3)二维反演剖面图得出卫宁北山—罗山坳陷带与鄂尔多斯西缘隆褶带内,总体表现出较低的电阻率电性结构特征,在中卫—同心断裂带与香山隆褶带表现出较高的电阻率电性结构特征,在西华山—六盘山隆褶带电阻率表现出低—高—低的电性结构特征。(4)构造解析图得出逆冲推覆滑脱面及拆离断层等地球物理找矿标志的深部展布特征,结合香山地区的矿产资料、地质资料和地球物理资料,了解该地区的成矿地质背景、矿床成因与深部成矿构造环境,圈定天景山为找矿远景区。
[Abstract]:Based on the magnetotelluric sounding profile data of Pingchuan Shuiquan Ningxia Lingwu Hongliukeng in Gansu Province and taking the geological geophysical structure of Xiangshan area as the background the deep electrical structure of Xiangshan area is established and combined with geophysics. The geological data, the extension of each deep fault zone along the section and the boundary zones of each tectonic unit are discussed, and the uplift belt along the western margin of Ordos and the Weining Beishan-Luoshan depression belt along the section are revealed. The electrical structural characteristics of the Zhongwei-concentric fault zone, the Xiangshan uplift belt, the Xingren-Haiyuan depression belt and the Xihuashan-Liupanshan uplift belt at a depth of 30 km and their interrelations, combined with the relevant data of the Xiangshan area. The main achievements of the study area include geological, geophysical and physical testing data, mineral evaluation and so on. The main exploration objects of this geophysical exploration work are summarized: Xiangshan thrust nappe, high resistivity rock mass, slip plane and typical fault. The geoelectric cross-section model of the single object and the geoelectric section model of the thick structure in the depth of the measured section are established, and the magnetotelluric forward modeling and inversion calculation are carried out. The simulation results show that MT method can effectively detect typical geological structures in the study area. (2) the impedance data of Zhang Liang can be processed and analyzed, and the 2-D deviation degree of the studied area is obtained, which reflects the main two-dimensional structure in the measured area. By using the impedance Zhang Liang decomposition method, the structural strike or tendency of different tectonic units along the profile direction is obtained (the optimum azimuth angle is obtained, and the optimum azimuth angle of the measured area is 22.5 degrees angle with the direction of the electrode arrangement. According to the optimum azimuth angle, the impedance is corrected by rotation. 3) the 2-D inversion profile is obtained in the Beishan-Luoshan depression of Weining and the uplift belt in the western margin of Ordos. On the whole, the electrical structure features of low resistivity and high resistivity in Zhongwei-concentric fault zone and Xiangshanlongfold zone. The resistivity of Xihuashan-Liupanshan uplift shows low-high-low electrical structural characteristics. 4) the deep distribution characteristics of geophysical prospecting marks such as thrust nappe slip surface and detachment fault are obtained. Combined with mineral data, geological data and geophysical data of Xiangshan area, the metallogenic geological background, ore genesis and deep ore-forming tectonic environment of this area are understood, and Tianjingshan is defined as a prospecting area.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.3

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