中国大陆中新生代变格运动及第一变格期盆地

DIKTYOGENESE AND BASINS IN CHINA CONTINENT DURING THE MESOZOIC-CENOZOIC

印支运动以来,中国大陆处于三面受挤的大地构造环境之中,发生了3期变格运动。第一变格期(晚三叠世到早白垩世)可分为2个阶段,其中晚三叠世到中侏罗世(阶段1:T3—J2),古特提斯洋关闭,发育与挤榨有关的前渊盆地;晚侏罗世—早白垩世(阶段2:J3—K1),怒江洋关闭,中国西部地区持续发育挤榨前渊盆地。由于伊佐奈岐板块(Izanagi Plate)俯冲碰撞,中国大陆东部北侧地区发育断陷盆地,南方地区前期前渊盆地被改造,或形成成排的小型拉分盆地。

The Chinese continent was compressed from three directions after the Indosinian orogeny, with 3 periods of diktyogenese movements. The first diktyogenese period could be divided 2 stages. Due to the closing of the Palaeo-Tethys, the foredeeps which were related to squeeezing were developed in the stage 1（T3-J2） in West China. As a result of the closing of the Nujiang Ocean, the squeezing foredeeps were continuously developed in the stage 2（J3-K1）. The fault basins were developed in NE China and the former foredeeps were reformed or small pull apart basins were arranged in rows in South China, owing to Izanagi Plate subduction and collision.