地层界线上灾变事件标志和成因的探讨  

Inquiring into Indicators and Origin of Catastrophic Events at Stratigraphic Boundaries

作　　者：张勤文[1] 徐道一[1] 

机构地区：[1]中国地质科学院地质研究所,国家地震局地质研究所

出　　处：《地球学报》1994年第Z2期192-199,共8页Acta Geoscientica Sinica

基　　金：中国科学院南京古生物地质研究所现代古生物学和地质学开放实验室的课题

摘　　要：在中国显生宙的一些重要地层界线如前寒武纪─寒武纪、二叠纪─三叠纪、白垩纪—第三纪以及奥陶纪─志留纪、泥盆纪─石炭纪等均发现有灾变事件的标志。这些标志是界线粘土层、微球粒、铱异常、生物大规模绝灭、陨石作用等。作者支持地层界线灾变事件地外成因的假说，而且认为，不同地层界线上的灾变事件可能具有不同性质的灾变过程。Since 1982,considerable indicators of catastraphic events have been observed at the main stratigraphic boundaries in China during the Phanerozoic,i.e. Precambrian-Cambrian,Permain-Triassic, Cretaceous-Tertiarv as well as Ordovician-Silurian and Devonian- Carboniferous bounda-ries. These marks are boundary clay layer,microspherules,high Iranomaly,mass extinction of organism and impact of meteorite. We support the hypothesis ofextraterrestrial origin of catastrophic events and suggest that the events at differentstratigraphic boundaries might be different in feature and process.

关 键 词：灾变事件 标志和成因 地层界线 

分 类 号：P5[天文地球—地质学]