西南石油大学学报(自然科学版)

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Frontiers of the Oceanic Anoxic Events(OAEs),Terrestrial Deposits and
Development of Source Rocks

Hu Guang1,2, Cao Jian3, Hu Wenxuan3, Yao Suping3, Liu Wenhui2   

  1. 1. School of Ocean and Earth Science,Tongji University,Hongkou,Shanghai 200092,China;2. Wuxi Research Institute of Petroleum Geology,
    SINOPEC,Wuxi,Jiangsu 214151,China;3. School of Earth Sciences and Engineering,Nanjing University,Nanjing,Jiangsu 210093,China
  • Online:2014-10-01 Published:2014-10-01

Abstract:

Oceanic Anoxic Event(OAE)is the key to decipher the Cretaceous Earth System. The studies of the terrestrial
deposits which were isochronous to OAE and impaction on source rocks are essential supplements for the researches on OAE.
Take a reviewing look on this field,three trends can be drawn:(1)the scope of OAE researches become wider,and begin to
concern the terrestrial deposits;(2)the work on OAE become more detailed,and more attention are paid to the geochemical
characteristics of different types of organic matters;(3)the precisions of studies become higher,and high resolution and dense
sampling strategy are begins to be carried out. However,the features and the triggers of the OAE are still disputed,and whether
or not there are the terrestrial responses to OAE remains enigmatic. The research of terrestrial deposits which were isochronous
to OAE is still very less,especially the correlation between marine and terrestrial systems under the precise chronological
framworks. In addition,although the black shales that deposited during the OAE are important source rocks,but so far less
attention paid to the impacts of OAE on the source rocks. The case study on the Lower Cretaceous terrestrial-transitional black
shales(deposited during 113 ± 3 Ma to 109 ±2 Ma)indicated that these black shales not only are isochronous to the OAEs
but also have similar negative carbon isotopic characteristics. The terrestrial-transitional Lower Cretaceous black shales in
southeastern China might have relation with OAE. The OAE has active influence on the formation of terrestrial source rocks.

Key words: Oceanic Anoxic Event(OAE), terrestrial deposits, lower Cretaceous, southeastern China, source rock