摘要
通过对六盘山群中上部湖相沉积中一层黑色页岩年代(113.45～112.98Ma)及其下部泥灰岩的元素地球化学特征研究发现,黑色页岩形成于干热而相对湿润气候背景下的缺氧还原环境中,与典型缺氧事件黑色页岩的地球化学特征基本一致,说明该黑色页岩记录了六盘山地区对全球白垩纪大洋缺氧事件OAE1b(约113～111Ma)的响应,可能指示该期大洋缺氧事件是一次全球性的气候变化事件。
Several blackshale beds have been discovered in the intermediate member of the Early Cretaceous Liupanshan Group.Analysis of the elemental geochemistry of a blackshale bed whose magneto-stratigraphic age is 113.45-112.98 Ma shows that it formed in a wet and hot environment.The variation of its geochemistry is consistent with the typical blackshale of oceanic anoxic setting,and indicative of the blackshale here having been deposited in an anoxic environment.This suggests that the blackshale in Liupanshan Group probably is the response to the OAE1b in the Liupanshan area.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2012年第4期255-259,共5页
Earth Science Frontiers
基金
国家自然科学基金项目(40972025,40721061)
教育部新世纪人才计划项目(NCET-07)
高等学校学科创新引智计划项目(B06026)
