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一、陕甘宁盆地区域地质构造概况1.盆地的范围陕甘宁盆地跨陕、甘、宁、内蒙、晋五省区。过去人们对盆地的范围理解不一致,有人把盆地周边的结晶变质岩大山(秦岭、贺兰山、大青山、吕梁山等)作为盆地的边缘;也有人以三叠系的沉积范围作为盆地的边界。我们认为应当从“现代构造盆地”概念出发,以陕甘宁盆地大向斜周边隆起外侧的大断裂作为分界,即渭河断陷北侧大断裂,离石大断裂,河
I. Overview of Geological Structure in the Region of Shaanxi-Gansu-Ningxia 1. Scope of the Basin Range of Shaanxi, Gansu-Ningxia, Shaanxi, Gansu, Ningxia, Inner Mongolia and Jin provinces. In the past, people did not understand the range of the basin. Some people used the crystalline metamorphic rocks (Qinling Mountains, Helan Mountains, Daqingshan Mountains and Luliangshan Mountains) around the basin as the edge of the basin. Others used the sedimentary range of the Triassic as the basin boundary. In our opinion, we should proceed from the concept of “modern tectonic basin” and take the large faults on the outer side of the syncline around the major syncline in the Shan-Gan-Ning basin as the boundary, that is, the large faults and the large ruptures of the north of the Weihe Fault Depression,