鄂尔多斯盆地基底构造重磁解释

发布时间：2018-09-11 06:19

【摘要】：鄂尔多斯盆地是在印支运动后滨太平洋和特提斯-喜马拉雅构造域强烈活动时期下形成的,是不稳定的克拉通内的叠合盆地,是华北地块的一部分,在地质构造和矿产资源方面有着特殊的意义。鄂尔多斯盆地的形成和发展是多个板块长期运动相互作用的结果。该盆地的基底形成于太古代-元古代时期,期间经历了吕梁、晋宁、加里东、海西、印支、燕山及等多期构造运动旋回,发生了复杂的变质、变形及混合岩化作用。盆地的发育大致经历了六个大的构造演化阶段,分别为太古代-早元古代基底形成时期、中晚元古代大陆裂谷发育时期、早古生代盆地与边缘坳陷时期、晚石炭世-早二叠世盆地与碰撞边缘形成时期、中生代大型内陆坳陷发育时期、新生代周缘断陷发育时期。根据重力异常和航磁异常特征,推测鄂尔多斯盆地基底可能存在一条北东向分布的古老岩系,其岩性由兴和岩群和集宁岩群组成。推测鄂尔多斯地块在早太古代至晚太古代出现古陆(核)形成陆块基底雏形,这是华北古陆的陆核生成时期。本次论文搜集了关于鄂尔多斯盆地的地质、地球物理等各方面的资料,包括专题研究报告、石油地质志、区域地质志、专著文献等,通过对鄂尔多斯盆地基底界面反演和2.5D重磁联合剖面反演,了解其基底的构造形态和深度等。通过查资料了解鄂尔多斯盆地和华北地块的构造演化史,分析两者基底的不同和联系,为地质构造方面提供地球物理依据。
[Abstract]:The Ordos basin was formed during the intense activities of the Indosinian aftersea Pacific Ocean and the Tethyan Himalayan tectonic domain. It is a superimposed basin within the unstable craton and is a part of the North China block. It has special significance in geological structure and mineral resources. The formation and development of Ordos basin is the result of long-term interaction of multiple plates. The basement of the basin was formed in Archaeo-Proterozoic period, during which Lv Liang, Jinning, Caledonian, Hercynian, Indosinian, Yanshanian and other tectonic cycles occurred complex metamorphism, deformation and migmatization. The development of the basin has undergone six major tectonic evolution stages, namely, the Archean to early Proterozoic basement formation period, the middle and late Proterozoic continental rift development period, the early Paleozoic basin and the marginal depression period. The late Carboniferous to early Permian basins and collision margin formation period, Mesozoic large-scale inland depression development period, Cenozoic peripheral fault depression development period. According to the characteristics of gravity anomaly and aeromagnetic anomaly, it is inferred that there may be an ancient rock series in the basement of Ordos basin, which is composed of Xinghe rock group and Jining rock group. It is inferred that the early Archean to late Archean ancient land (nucleus) appeared in the Ordos block to form the prototype of the continental block, which is the age of the formation of the North China paleocontinent. This paper collected information on the geology, geophysics and other aspects of the Ordos Basin, including special research reports, petroleum geological records, regional geological records, monograph documents, etc. Based on inversion of basement interface and 2.5D gravity and magnetic profile in Ordos Basin, the structural morphology and depth of basement are understood. The history of tectonic evolution of Ordos basin and North China block is studied, and the difference and relation between them are analyzed, which provides geophysical basis for geological structure.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P548

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