大别山区同位素年龄与区域变质作用构造运动的关系  

RELATIONSHIP OF ISOTOPE AGES IN DABIE MOUNTAIN.AREA TO REGIONAL METAMORPHISM AND TECTONIC MOVEMERT

作　　者：李世长 陈宗驯 徐万斌[2] 

机构地区：[1]水利部淮河水利委员会 [2]合肥工业大学

出　　处：《合肥工业大学学报（自然科学版）》1993年第3期159-164,共6页Journal of Hefei University of Technology：Natural Science

摘　　要：大别山区同位素年龄资料主要有K—Ar及40Ar/39Ar法和V-P_b法。K-Ar法同位素年龄值岩层上部较老,下部较新,是由于矿物结晶的先后顺序不同引起的,可能反映了地壳上升剥蚀过程,V-P_b法同位素年龄值相差较大,可能是锆石晶体随塑性体运动,互相混合造成的,K-Ar及40Ar/39Ar法与V-P-b法同位素年龄所反映的地质事实,是有差别的,但又是互相联系密不可分的。The age determinations made by way of radiometric dating in Dabie mountain area mainly utilize the potassium-argon (K-Ar and 40Ar/39Ar) method and the uranium-lead (V - Pb) method.The ages measured using K-Ar method, which show that the upper rock strata are older than the lower strata,is the result of the different sequence of mineral crystallization and may reflect the uplift and denudation course of the crust.The ages by V-Pb dating,which disagree significantly,may be caused by the zircon crystal 's moving together sith plastic bady and mixing with each otherAlthough the geologic facts reflected by the two methods are different there are dose relation between the factw.

关 键 词：同位素年龄 区域变质作用 构造运动 

分 类 号：P597[天文地球—地球化学]