摘要
桂西、桂南地区的构造划分历来认识不同,各家说法不一,本文根据该区各时期地壳运动遗留的建造、改造遗迹认为该区比较特殊,印支运动之前,全区以海相沉积为主时,该区主体是"南岭地槽"。其特殊之处:(1)加里东运动地槽褶皱时钦州地区未褶皱,成残余海槽,东吴运动时方才褶皱;(2)地槽褶皱后,盖层沉积时因地球膨胀影响该区中三叠统是一套地槽型沉积;印支运动时形成地槽型褶皱。因此称它"南岭地槽桂西、桂南印支复活区"。地球膨胀、洋壳形成的印支期,大陆地壳上的地洼时期,该区是中国东南地洼区的西南端。洋壳消减时期,该区属滨东印度洋活化带。
The tectonic division of west and south Guangxi has different understanding with varying opinions. According to the construction and reconstruction relic of crustal movement of each period in the region this area is considered to be in special. Before the Indosinian movement the region is mainly ＂Nanling geosyncline＂ for the marine sedimentary environment in the whole area. The Special points are listed as follows. （1） With geosynclinal folding in Caledonian movement the Qinzhou district did not take place folding and became residual trough only in the Dongwu movement it took place folding. （2）After geosyncline folding the middle Triassic system is a set of geosynclinal sediments in the cover layer deposition due to the influence of the earth expansion. Geosynclinal fold is formed during the Indosinian movement. Therefore it is called ＂Nanling geosyncline in the west south of the Indo Chinese revival area＂. In the Indo Chinese epoch of the earth＇s expansion the formation of the oceanic crust and DIWA period in the continental crust the area is the westsouthern part of China eastsouth DIWA region. In oceanic crust subduction period the area is belonged to India ocean Bindong active zone.
出处
《矿产与地质》
2017年第1期69-74,共6页
Mineral Resources and Geology
关键词
构造划分
地质建造
改造遗迹
构造演化
桂西
桂南
tectonic division, geological construction, reconstruction relic, tectonic evolution, west Guangxi, south Guangxi
