Mesozoic paleogeography and tectonic evolution of South China Sea and adjacent areas in the context of Tethyan and Paleo‐Pacific interconnections
Mesozoic paleogeography and tectonic evolution of South China Sea and adjacent areas in the context of Tethyan and Paleo‐Pacific interconnections
复制标题
DOI：
10.1111/j.1440-1738.2008.00611.x
复制
发表时间：
2008-06
期刊：
影响因子：
1.5
通讯作者：
Di Zhou;Zhen Sun;Han-zong Chen;He‐hua Xu;Wan‐yin Wang;X. Pang;Dongsheng Cai;D. Hu
中科院分区：
文献类型：
--
作者：
Di Zhou;Zhen Sun;Han-zong Chen;He‐hua Xu;Wan‐yin Wang;X. Pang;Dongsheng Cai;D. Hu
摘要中生代时，南海及其周边地区位于欧亚大陆的东南边缘。关于特提斯和古太平洋构造对该地区中生代演化的影响一直存在激烈的争论。本文编制了六个时间切片的岩相图，并以此为依据，结合构造变形和岩浆活动等资料，讨论了该区的古地理和构造演化。早三叠世古特提斯洋通过宋大通道向东延伸至研究区。于是，一场重大的东西差异化演变开始了。晚三叠世，由于印支造山运动期间印支陆块与华南陆块的碰撞，导致西部隆起，宋大通道关闭。与此同时，该区东部和东南部发生了古太平洋沃茨的海侵，形成了“粤东-西北婆罗洲海”。早侏罗世，海水海侵更加明显，导致该海与西部的中特提斯洋相连。大量携带特提斯生物的特提斯水进入该地区。中侏罗世，中特提斯东部发生了一次短暂的海侵，形成了滇缅海。晚侏罗世至早白垩世是中特提斯和古太平洋向欧亚大陆俯冲的高潮。这导致了在白垩纪中期或晚期形成了巨大的“环东南亚俯冲-增生带”。本文还提供了各种证据，证明这一中生代俯冲-增生带的一个新认识的区段埋在南海东北部的新生代沉积物之下。
Abstract During the Mesozoic era, the South China Sea and its environs were located at the south‐eastern margin of the Eurasian continent. There has been hot debate on the influences of Tethyan and Paleo‐Pacific tectonics to the Mesozoic evolution of the area. This paper compiles lithofacies maps of six time slices and discusses the paleogeographic and tectonic evolution of the area based on this compilation and other data on structural deformation and magmatism. In the Early Triassic, the Paleotethys Ocean extended eastward to the study area through the Song Da passage. Then a significant east–west differential evolution began. In the Late Triassic, the western area uplifted as a result of the collision between the Indosinian and South China blocks during the Indosinian orogeny, and the Song Da passage has closed since then. Meanwhile, a transgression of Paleo‐Pacific waters occurred in the eastern and south‐eastern portions of the area, forming the ‘East Guangdong–North‐west Borneo Sea’. In the Early Jurassic, seawater transgression was even more pronounced, resulting into the connection of this sea with the Mesotethys Ocean to the west. Large quantities of Tethyan water carrying Tethyan organisms entered the area. In the Middle Jurassic, a short‐lived transgression occurred in the eastern Mesotethys and resulted in the formation of the ‘Yunnan–Burma Sea’. The Late Jurassic to Early Cretaceous was the climax of the subduction of both the Mesotethys and Paleo‐Pacific towards the Eurasian continent. This led to the formation of the great ‘Circum South‐east Asia Subduction–Accretion Zone’ in the Middle or Late Cretaceous. This paper also presents various lines of evidence for a newly recognized segment of this Mesozoic subduction–accretion zone buried under Cenozoic sediments in the north‐eastern South China Sea.