白垩纪大洋沉积转变期间松辽盆地的沉积响应

SEDIMENTARY RESPONSE OF SONGLIAO BASIN DURING CRETACEOUS OCEANIC DEPOSITIONAL TRANSITION

白垩纪大洋红层多位于大洋缺氧事件的黑色页岩之上,这一沉积转变现象对白垩纪的碳氧循环、古气候与古海洋演化的研究具有重要的指示意义。在松辽盆地内同样也在黑色页岩之上普遍发现了红层,该红层也同样极少被关注。为了探寻两者之间的联系,在综合并评述前人研究成果的基础上,对白垩纪大洋沉积记录转变与松辽盆地的沉积记录转变进行了对比分析,探讨了两者沉积环境转变的过程和机制。研究表明:白垩纪松辽盆地的沉积转变是对大洋沉积转变的一种响应。

Mostly, the Cretaceous Oceanic Red Beds (CORB) overly black shale of oceanic anoxic events. This depositional transition has an important meaning for studying Cretaceous carbon and oxygen cycles, palaeoclimatology and palaeoceanography. Red beds have also been found over black shale in Songliao Basin. However, the beds have not been paid much attention to. In order to explore the relationship between red beds and black shale, a comparative analysis of both Cretaceous oceanic depositional transition and Songliao Basin's depositional transition is carried out based on the previous achievements. Meanwhile, the procedure and mechanism of the two transitions are discussed. The result shows that the Cretaceous depositional transition of Songliao Basin is a response to the oceanic depositional transition.