华南三水盆地白垩纪—早第三纪古纬度漂移与南海演化

CRETACEOUS-EARLY TERTIARY PALEOLATITUDE MIGRATION IN SANSHUI BASIN OF SOUTH CHINA AND THE EVOLUTION OF SOUTH CHINA SEA

本文主要依据三水盆地古地磁数据所反映的华南地块的古纬度漂移讨论南海的演化模式。结果认为,华南在南海的形成演化中居主导地位,南海基本上是晚白垩世至中新世期间通过华南的南漂及其后的北向回漂过程中,华南大陆南部的拉张、断裂、解体并自东向西扩展的方式形成的,而南海中散布的微大陆碎块则是在华南回漂时被滞留下来的。演化过程中,其周缘菲律宾岛弧自南向北漂,直到上新世后才构成南海的东界;印支地块则仅起转换边界作用;加里曼丹则基本土没有明显的漂移。

In this paper, the authors discuss the evolutionary model of the South China Sea based on the data of Sanshui Basin which indicate the paleolatitude migration of South China. The results show that South China played a prevailing role in the evolution of the South China Sea which has been basically formed by the southward migration of South China continent and then backward in the course of extension, faulting and breaking up in the south of South China during Late Cretaceous to Miocene.The microcontinent fragments which scattered in South China Sea today were left there when South China migrated back. The Philippine Arc migrated northward with Philippine Sea Plate until Pliocene to form the eastern boundary of the South China Sea. The Indochina block only played a transitional boundary role. No obvious migration could be found in Kalimantan.