论文部分内容阅读
阴山造山带位于鄂尔多斯盆地的北缘,这一地带不仅是构造活动强、弱的变异地域,且为盆、山的耦合地带,故在造山带与盆地地域具有各异的深层动力过程.本文基于高精度人工源地震宽角反射、折射探测和高分辨率的数据采集,通过反演求得了满都拉—鄂尔多斯—榆林—延川长达650 km剖面辖区的岩石圈精细层、块结构.研究结果表明:①沿该剖面由南向北地壳厚度为40～45 km;在不同构造单元其介质、结构均不相同;速度分布、空间结构形态和界面起伏及属性亦存在着明显差异;上地幔顶部速度为8.0～8.1 km/s;②沿剖面存在5条深、大断裂,且将该区切割成为壳、幔结构明显差异的4个构造单元,即鄂尔多斯盆地、盆山耦合地带、阴山造山带、内蒙构造带,它们各自具有固有的深层过程和动力学响应.同时厘定了阴山造山带与内蒙构造带之间的白云鄂博深、大断裂带是古亚洲洋的南界.在这里不仅导致了阴山造山带的形成,而且聚集了诸多的金属矿产资源,地震亦频繁活动.基于上述研究表明,阴山造山带—鄂尔多斯盆地耦合地带的壳、幔结构复杂、呈现出速度结构各异的层、块状展布.显然,在这一错综的成山、成盆、成岩、成矿和成灾地带,有着特异的深层过程和动力机制.
The Yinshan orogenic belt is located at the northern margin of the Ordos Basin and is not only a strong and weak variation area of structural activity but also a coupling zone of basin and mountain so that it has different deep dynamic processes in the orogenic belt and the basin area.Based on this, The high resolution artificial source seismic wide angle reflection, refraction detection and high resolution data acquisition were used to obtain the lithospheric fine layers and block structures of the Mandula-Erdos-Yulin-Yanchuan up to 650 km area by inversion. The results show that: ① The thickness of the crust along the section from south to north is 40 ~ 45 km; the medium and structure are different in different tectonic units; the velocity distribution, the spatial structure, the interface undulation and the property also have obvious differences; There are five deep and large faults along the profile, and the area is cut into four tectonic units with obvious difference in crust and mantle structure, that is, the Ordos Basin, basin-mountain coupling zone, Yinshan orogenic belt , Inner Mongolia tectonic belt, each of them has inherent deep process and dynamic response.At the same time, the depth of Bayan Obo deep between the Yinshan orogenic belt and Inner Mongolia tectonic belt was determined, and the major fault zone was The southern boundary of the Asian Ocean, where not only led to the formation of the Yinshan orogenic belt, but also gathered a great deal of metal mineral resources and frequent earthquakes. Based on the above studies, the crust and mantle structure of the Yinshan orogenic belt in the coupling zone of the Ordos Basin is complex , Showing the velocity structure of different layers, block distribution.Obviously, in this intricate mountain, basin, diagenesis, mineralization and disaster zone, has a unique deep process and dynamic mechanism.