东南大陆早古生代古地理轮廓

由早中元古代中深变质岩系组成的华南加里东海盆基底及东海、南海古陆。元古代晚期,海盆在拉张环境下继续沉降,于震旦、寒武、奥陶纪期间,沉积了厚近两万米的地槽型火山-砂泥质建造,陆源碎屑主要来自东海、南海古陆,直到中生代晚期古陆才裂陷成海,始成今日的海陆分布格局。

PALAEOGEOGRAHIC CONFIGURATION OF SOUTHEAST CHINA DURING EARLY-PALEOZOIC

The basement of South China sea basin since Sinian ancient land of East China sea and South China Sea are composed of medium- highgrade metamorphic rock series ibrmacd in mid- early Proterozoic which are widespread under covers of Sinian to Cenozoic ages. In late Proterozoie, South China sea basin that was located between ancient land of East China Sea and Sunth China Sea and Jiangnan ancient land, continued to subside under the environment of tension, and in which geosyncline volcainc psammitic and pelitic formation was deposited in Sinian, Cambrian and Ordovician Period, with total thickness about twenty thousand meters terrigenous material mainly came from ancient land of East China Sea and South China Sea. To late stage of Mesozic the ancient land of east Chian sea and South China Sea (To late stage of M esozoic, the ancient land of East and South China Sea) broke up and subsiedcd into a sea and recent state of the distribution of both sea and land made up.