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Late Oligocene Tectonic Event in the Northern South China Sea and Its Implications

详细信息

责任者：Shao Lei (State Key Laboratory of Marine Geology ; Tongji University ; Shanghai 200092 ; China) ; Pang Xiong
刊名：Earth Science
出版年：2009
卷期：34(5)
关键词：海底扩张 ; sea-floor spreading ; 南海 ; South China Sea
页码：p.717-724
图表：4 illus., 33 refs.
分类号：0300
issnNo：ISSN1000-2383
isbnNo：CN42-1233/P

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.

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