摘要
第四系下界 (Q/N界线 )问题是第四系研究中的最基本问题之一 ,一个世纪以来争论激烈 ,大概可分为 :(1 )第四系取消论 ;(2 ) Q/N界线在 3 5 0～ 3 0 0万年 ;(3 )在 2 4 0万年左右 ;(4)在 1 5 0～1 90万年间 ;(5 ) 70万年。在中国以 M/G界线为 Q/N界线的意见已占优势 ,但国际上仍以 1 70万年为主 .为了对这一问题作出中国的贡献 ,有必要在中国的黄土地层、河湖相地层中选几个界线层型剖面 。
The lower baundary of the quaternary or the boundary between the quaternary and the weocene (Q/N) is a bassic problem of the quaternary research.A heated dispute has continued in the past century.The opinions are (1) the quaternary should be canceled;(2) (Q/N) boundary should be put in 3.5~3.0 MaBP;(3) in about 2.4 MaBP;(4) in 1.5~1.9 MaBP;(5) in 0.7 MaBP.To put (Q/N) boundary on M/G boundary is a dominount opinion in China, but in abroad,1.6～1.8 MaBP is in dominant position.In order to promote Chinese contribution to this problem,it is necessary to setect several (Q/N) boundary type sections in loess strata and allural-lacustrine strata,to do more work on them,to demonstrate the (Q/N) boundary.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2002年第5期55-58,共4页
Journal of Chang’an University(Natural Science Edition)
