白垩纪大洋红层:特征、分布与成因

Cretaceous Oceanic Red Beds: Characters, Occurrences, and Origin

“白垩纪大洋红层”(CORB)这一认识自20世纪末正式提出后已经迅速成为白垩纪新的研究方向之一。根据西藏南部和意大利中部两个研究程度较高地区所获得的地层、岩石、矿物等实际资料和已有的研究成果,结合国内外CORB的研究现状,对全球CORB的特征及分布进行了总结和归纳,同时对大洋红层蕴涵的古海洋、古气候信息进行了详细分析。在此基础上提出,CORB是氧化条件下原地沉积的产物,导致该氧化条件出现的主要因素是底层水中高含量的溶解氧,而深层古洋流的发育很可能是产生溶解氧含量增加的主要原因。

The idea ＂ Cretaceous Oceanic Red Beds＂ （CORB） has become one of hot topics since it was put forward and initiated by Chinese scholars during latest 1990s. This paper tries to overview scientific results, especially from our research results, related to the CORB studying. The geological and geochemical characters of the CORB from both southern Tibet, the eastern Tethys Ocean, and central Italy, the western Tethys ocean, were introduced in detail. Based on global correlation, the features and occurrences of the CORB were characterised. We also discussed the implications of CORB related to response of the paleoceanographic and paleoclimatic changes. We believe that CORBs were deposited in highly oxic environment with higher contents of dissolved oxygen at the bottom water level, which might be the result of paleooceanic circulation.