鄂尔多斯盆地西缘(部)中生代构造属性  

Attributes of the Mesozoic Structure on the West Margin of the Ordos Basin

作　　者：刘池洋[1] 赵红格[1] 王锋[1] 陈洪[1] 

机构地区：[1]西北大学大陆动力学教育部重点实验室

出　　处：《地质学报》2005年第6期737-747,共11页Acta Geologica Sinica

基　　金：国家重点基础研究发展计划"973"项目(编号2003CB214600)资助的成果。

摘　　要：鄂尔多斯盆地西缘构造带独特的大地构造位置、复杂的构造特征、活跃的新构造运动和良好的矿产赋存条件,长期以来为诸多地质学和矿产学者所关注;并从不同角度对该区带的区域地质构造特征和构造属性进行了程度不同地探讨,提出了不尽相同的认识。近年来,有不少研究者将其中生代构造属性划归“前陆盆地”。在地质历史上,适于前陆盆地发育的地球动力学环境,在时间和空间上均是相当有限的。鄂尔多斯盆地西缘(部)处于多个性质不同大地构造单元的结合部位,构造特征因地而异,演化过程十分复杂。本文根据最新勘探资料和测试结果,通过对区域背景、盆山关系、沉积响应、构造特征、原盆面貌、演化过程、发育时限和后期改造等方面的综合研究认为,鄂尔多斯盆地西部在中生代整体上不具前陆盆地属性,为大型残延克拉通内盆地的组成部分;仅在晚侏罗世以来盆地发育晚期和之后的有限时期和局部地段,存在有与前陆盆地结构“貌似”的剖面组合特征。Many geologists and scholars in mineral deposits have paid attention to the west margin of the Ordos basin for a long time because of its special tectonic location, complex structure features, active neotectonic movement and favorable mineral occurrence conditions. Different discussions and researches have been done from many aspects on the regional geological structural characteristics and attributes of the study area and have proposed various views. In recent years, a few researchers have been assured that the Mesozoic Ordos basin is a foreland basin. The geodynamic environment in which foreland basin is developed is rather limited both temporally and spatially in the geological history. The west Ordos basin is located at the conjunction of several geotectonic parts with various structure features in different places and complicate evolution processes. Through comprehensive researches on regional background, basin-range relationship, prototype basin geomorphology, sedimentary response, structural characteristics, evolution process, time of development and later reformation based on exploration data up to date and testing results, it is concluded in the paper that the west Ordos basin in the Mesozoic was not a foreland basin on the whole, but one part of the basin in the huge residual and continuous craton. Only in a finite period and a local area （belt） in or after the late age of the basin development since the Late Jurassic has the west Ordos basin had combination section features similar to the structures of foreland basins.

关 键 词：鄂尔多斯盆地西缘 构造属性 残延克拉通内盆地 前陆盆地 盆山耦合 区域构造 

分 类 号：P534.5[天文地球—古生物学与地层学]