%0 Journal Article
%T A Study on the Boundary Age between Jurassic and Cretaceous<br>鄂西崆岭杂岩的组成,时代及地质演化
%A MA Da-shuan
%A LI Zhi-chang
%A XIAO Zhi-fa
%A <br>马大铨
%A 李志昌
%A 肖志发
%J 地球学报
%D 1997
%I 
%X It is agreed that the boundary level of the Jurassic Cretaceous is put in between the Dabeigou Formation (narrowsense) and Dadianzi Formation. The ages of the volcanic rocks from the Jehol(Rehe) Group and its underlying formations in Luanping County of Hebei those have bee measured by means of 40 Ar/ 39 Ar dating .The age of Jurassic-Cretaceous boundary is aroud 140±1 Ma which is recommended in this paper.
%K Sm_Nd U_Pb
%K geochronology
%K Kongling complex
%K geologic evolution<br>Sm＿N
%K dU＿Pb
%K 年代学
%K 崆岭杂岩
%K 地质演化
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=1DF69A47DE80569EC8F859DF61571180&aid=8A5BBB6F6CE57A26C53D0EC2965B18E6&yid=5370399DC954B911&vid=13553B2D12F347E8&iid=38B194292C032A66&sid=FD7C952458BFB5D8&eid=6A73B36E85DB0CE9&journal_id=1006-3021&journal_name=地球学报&referenced_num=31&reference_num=0