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拉鸡山构造带东西长逾 6 50km ,展布于由元古宇组成的结晶地块内部 ,是一条早古生代火山岩极为发育的构造带。通过作者在拉鸡山多年的野外调查工作和研究 ,认为该地区无论在区域地质学、岩石学、构造变形学还是大地构造演化方面 ,其早古生代构造演化史皆具典型的裂谷带特征。晚古生代以来 ,区内经历了陆内多阶段造山过程。新生代早更新世 ,拉鸡山巨型断裂带发生左旋走滑运动 ,导致断裂带弧形转折部位强烈崛起 ,形成雄伟高山。
The structure of Lajishan tectonic belt extends over 6 50 km in length between east and west. It is distributed in the crystalline block consisting of Proterozoic and Jurassic. It is an extremely ancient tectonic belt of Early Paleozoic volcanic rocks. Based on the author’s many years of field investigation in Laji Mountain, the author thinks that the Early Paleozoic tectonic evolution history of the area is characterized by typical rift zones in terms of regional geology, petrology, tectonic deformation and tectonic evolution. Since Late Palaeozoic, the region has experienced multi-stage orogeny inland. In the Cenozoic Early Pleistocene, left-lateral strike-slip occurred in the Jurassic fault zone, resulting in the strong rise of the arcuate turning point of the fault zone and the formation of majestic mountains.