蒙甘青宁地区侏罗纪开合盆山构造格局及原型盆地沉积特征

Jurassic basin-range tectonic pattern and depositional features of prototype basins in the Inner Mongolia-Gansu-Qinghai-Ningxia region

摘要: 侏罗纪蒙甘青宁地处西伯利亚板块,太平洋中依泽奈崎、法拉隆、菲尼克斯3板块及印度板块之间的东亚腹地部位。早、中侏罗世进入造山后的伸展-走滑盆山构造阶段,在盆山构造格局的负形地段孕育着大小不一的8种构造类型盆地,其偏南的多数地区处于亚热带温暖潮湿气候区,沉积了大量煤层及有机质页岩。晚侏罗世,盆山构造经历了不均匀挤压和抬升作用,不少早期盆地逐渐消失,并转为热带、亚热带干旱气候,残存盆地主体为一套红色沉积。编图研究表明,早、中侏罗世时期全区既不是统一的“泛盆”,也不是现今侏罗系分布区的小型盆地区,而是大中有小、盆山相间、多带展布的盆地群构造地貌。

Abstract: The Inner Mongolia-Gansu-Qinghai-Ningxia region was located in the interior of East Asia be-tween the Siberian plate ,three plates in the Pacific Ocean and Indian plate during the Jurassic.During the Early and Middle Jurassic ,the area went into the