摘要
大洋缺氧事件(OAE)是了解地球系统的关键事件之一,与其基本等时的陆相沉积是对海相体系内OAE研究必不可少的补充。目前关于OAE的研究范围越来越宽泛,已经开始了对与OAE同步的陆相沉积研究和探索;研究内容越来越细化,重视不同类型有机质的地球化学特征研究;研究精度越来越高,进入高分辨率和密集样品分析阶段。但OAE特征及其驱动机制存在争议;基本等时的海—陆黑色泥页岩事件之间的是否存在成因联系还不十分清楚,特别是置于精确年代学格架下的海—陆精细对比研究几乎没有。此外,与OAE相关的黑色泥页岩及其等时的陆相黑色泥页岩均是重要的烃源岩,而目前关于OAE对烃源岩的影响及石油地质意义研究较少。中国东南沿海地区的下白垩统可望提供一个良好研究实例,其陆相—过渡相黑色泥页岩形成于113±3Ma到109±2Ma,时间上与OAE吻合;碳同位素负漂特征与OAE相似,可全球对比。
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 fram works. 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.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第5期1-15,共15页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家自然科学基金(41472099
41322017)
国家重点基础研究发展计划(2012CB214801
2012CB214803)
关键词
大洋缺氧事件
陆相沉积
早白垩世
中国东南沿海
烃源岩
Oceanic Anoxic Event（OAE）
terrestrial deposits
lower Cretaceous
southeastern China
source rock
