大兴安岭地区中生代地层特征及侏罗-白垩纪界线的讨论  

THE MESOZOIC STRATA AND THE JURASSIC-CRETACEOUS BOUNDARY IN THE DAXINGANLING REGION

作　　者：邵积东[1] 谭强[1] 王惠[1] 张明[1] 贺宏云[1] 

机构地区：[1]内蒙古自治区地质调查院,内蒙古呼和浩特010020

出　　处：《地质与资源》2011年第1期4-11,共8页Geology and Resources

摘　　要：对大兴安岭地区侏罗-白垩纪地层的岩石地层单位特征、接触关系、分布情况以及古生物化石和同位素年代学资料进行了介绍.根据所划分岩石地层单位的岩性组合、接触关系和古生物化石及同位素年代资料,对侏罗-白垩纪的界线进行讨论.由于获得了一批大于145Ma的SHRIMP锆石U-Pb同位素年龄和古生物化石Peipiaosteus组合、Nestoria-Keratestheria组合、Ferganoconcha组合等资料,认为还应将侏罗-白垩纪的界线暂置白音高老组与梅勒图组及义县组之间.The Jurassic-Cretaceous strata in Daxinganling region are studied regarding the lithostratigraphic units,contact relation,distribution,paleontology and isotopic chronology.The J-K boundary is discussed on the basis of such study.The U-Pb isotopic ages of zircon by SHRIMP are greater than 145 Ma.With the support of fossil assemblages of Peipiaosteus,Nestoria-Keratestheria and Ferganoconcha,the J-K boundary is set between Baiyingaolao formation and Meiletu and Yixian formations.

关 键 词：中生代地层 侏罗-白垩纪界线 化石组合 同位素年龄 大兴安岭 

分 类 号：P535[天文地球—古生物学与地层学]