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Frontiers of Earth Science in China

, Volume 2, Issue 2, pp 138–146 | Cite as

Late Oligocene sedimentary environments and provenance abrupt change event in the northern South China Sea

  • Lei ShaoEmail author
  • Xiong Pang
  • Changmin Chen
  • Hesheng Shi
  • Qianyu Li
  • Peijun Qiao
Research Article

Abstract

A significant change in composition was recorded in late Oligocene sediments from the northern South China Sea. This abrupt event coincided with the seafloor spreading axis jump across the Oligocene/Miocene boundary, leading to sedimentation breaks and slumps as well as obvious changes in sediment geochemical composition, and representing the greatest tectonic activity in the South China Sea region since the Oligocene. Through this tectonic event, the sedimentary environment in the Baiyun sag area transformed from a continental shelf in the late Oligocene to a continental slope since the early Miocene, the provenance of the sediments changed from neighboring areas to the hinterland of the South China block, and the sea level rose since the early Miocene in the area. Therefore, this abrupt change event has a profound influence on the evolution of petroleum offshore in the northern South China Sea.

Keywords

South China Sea Baiyun sag Oligocene sedimentary environment provenance analysis 

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Copyright information

© Higher Education Press and Springer-Verlag GmbH 2008

Authors and Affiliations

  • Lei Shao
    • 1
    Email author
  • Xiong Pang
    • 2
  • Changmin Chen
    • 2
  • Hesheng Shi
    • 2
  • Qianyu Li
    • 1
  • Peijun Qiao
    • 1
  1. 1.State Key Laboratory of Marine GeologyTongji UniversityShanghaiChina
  2. 2.CNOOC Ltd. ShenzhenGuangzhouChina

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