Late oligocene tectonic event in the Northern South China Sea and its implications

被引：7
|
作者：
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China [1 ]
不详 [2 ]
不详 [3 ]
不详 [4 ]
机构：
[1] State Key Laboratory of Marine Geology, Tongji University
[2] CNOOC Ltd., Shenzhen Branch
[3] Beijing Research Center of CNOOC Ltd.
[4] Guangzhou Institute of Geochemistry, CAS
来源：
Diqiu Kexue Zhongguo Dizhi Daxue Xuebao | 2009年 / 5卷 / 717-724期
关键词：
Baiyun Sag; Oligocene; Seafloor spreading; South China Sea; Tectonic event;
D O I：
10.3799/dqkx.2009.079
中图分类号：
学科分类号：
摘要：
A significant tectonic event was recorded in late Oligocene sediments from ODP Site 1148 and Pearl River Mouth Basin. This tectonic event coincided with the seafloor spreading axis jump event across the Oligocene/Miocene boundary, leading to a series of changes not only in seafloor spreading direction but also types of sedimentary basins and sediment provenances, and representing the greatest tectonic activity in the South China Sea region since the Oligocene. Sedimentation breaks and slumps as well as obvious changes in sediment composition across the Oligocene/Miocene boundary indicate the existence of the tectonic event, which transformed the Pearl River Mouth Basin from a graben basin to a down-warped basin, and the sedimentary environment in the Baiyun Sag area from continental shelf in the late Oligocene to continental slope since the early Miocene. It played a key role in the transformation of the general topographic character in continental China and ended a period of accumulation of good source rock for petroleum offshore. Therefore, this tectonic event has a profound influence on the evolution of the South China Sea and East Asia.
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页码：717 / 724
页数：7
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