关键词: 构造变形, 构造层, 构造分析, 上古生界, 大兴安岭, 东北地区

Abstract:

The structure and deformation studies show that the Upper Paleozoic have been suffered three deformation events since the end of the Permian in the Daxing’anling area. The first deformation produced E-W trending faults and folds, which were resulted from the collision between the North China plate and Jia-Meng block along the Xar Moron River suture zone. The second deformation formed NE-NNE trending sinistral strike-slip faults and folds due to the western Pacific Oceanic plate subduction to the Asian continent in Jurassic. The third deformation produced the NW trending faults with dextral strike-slip feature in the Late Jurassic-Early Cretaceous. The four tectonic layers of Early Paleozoic, Devonian-Early Carboniferous, Late Carboniferous-Middle Permian and the Late Permian-Early Triassic have been divided according to the studies and the comparisons of regional tectonics and paleo-geography in the Daxing’ anling area. After Caledonian movement in the end of the Early Paleozoic, the area was in the regional extension tectonic setting during Devonian-Early Carboniferous, which developed marine facies sediments to the north and terrestrial facies sediments to the south. In the end of the Early Carboniferous the Songnen block collided with the Ergun-Xing’an block along the Nenjiang-Zhalantun belt. During the Late Carboniferous-Middle Permian, the area was in the regional post-orogeny extension tectonic setting with the sediments of the terrestrial facies in the north and the marine facies in the south. The Paleo-Asian Ocean was closed during the Late Permian-Early Triassic period, the sea water retreated from the area and became terrestrial setting.

Key words: structural deformation, tectonic layer, structural analysis, Upper Paleozoic, Daxing’anling, NE China