Possible impact event in the Late Cambrian  

作　　者：O.A.Korchagin S.V.Dubinina V.A.Tsel'movich I.I.Pospelov 

机构地区：[1]Geological Institute,Russian Academy of Sciences,Moscow 109017,Russia [2]Geophysical Observatory Borok-Branch of Institute of Physics of the Earth,Russian Academy ofSciences,Borok,Russia

出　　处：《Global Geology》2007年第1期78-82,共5页世界地质（英文版）

摘　　要：The repeated investigation of the Batyrbay section has been done by the authors. Today we see in- creasing of interest to revising of volumes and boundaries of Stages and Series in the Cambrian and Ordovician, as well as to the events of this time. In this work the description of iron spherules and particles, found in the deep-water limestone layer of the conodont Cordylodus prirnitivus Zone in the middle Upper Cambrian of the Batyrbay section, Malyi Karatau of South Kazakhstan, and formed during the time of global sea-level changes known as a world-wide Lange Ranch Eustatic event, have been done. From our point of view, finds of iron spherules and particles may evidence about new unknown yet Event of cosmic origin, i.e. falling of a meteorite on Earth in the middle Late Cambrian.The repeated investigation of the Batyrbay section has been done by the authors.Today we see increasing of interest to revising of volumes and boundaries of Stages and Series in the Cambrian and Ordovician,as well as to the events of this time.In this work the description of iron spherules and particles,found in the deep-water limestone layer of the conodont Cordylodus primitivus Zone in the middle Upper Cambrian of the Batyrbay section,Malyi Karatau of South Kazakhstan,and formed during the time of global sea-level changes known as a world-wide Lange Ranch Eustatic event,have been done.From our point of view,finds of iron spherules and particles may evidence about new unknown yet Event of cosmic origin,i.e.falling of a meteorite on Earth in the middle Late Cambrian.

关 键 词：Batyrbay Kazakhstan Upper Cambrian SPHERULES IRON METEORITE EVENT 

分 类 号：P534[天文地球—古生物学与地层学]