秦岭地区花岗岩的K-Ar等时年龄和^(39)Ar-^(40)Ar年龄及其地质意义  

The Ages of K-Ar Isochron and ^(39)Ar-^(40)Ar of Granites from Qinling Area and Their Geological Significance

作　　者：朱铭[1] 

机构地区：[1]中国科学院地质研究所

出　　处：《岩石学报》1995年第2期179-192,共14页Acta Petrologica Sinica

基　　金：中国科学院重点课题

摘　　要：本文在总结大量的公开发表的Ｋ－Ａｒ表面年龄的基础上，提出了３６Ａｒ对定年的影响，揭示了３６Ａｒ对秦岭地区花岗岩Ｋ－Ａｒ定年系统的意义，较好地显示出该区岩浆活动的冷却时间主要集中在４７０～５７０、３０９～３６０、２１４～１９０、９５～１０５Ｍａ年前四个时期，为扬子板块与华北板块在古生代以后动力地质的过程提供了明确的时间轨迹的上限。This article summarized a large number of published K--Ar apparent ages. On this basis the influence of 36Ar on the dating is proposed demonstrating its significance for the K-Ar dating system of granites from Qinlin area. It is well illustrated that the cooling periods of the magmatic activeties in this area are mainly concentrated in the four stages of 470-570, 309-360, 214-190 and 95-- 105 Ma ago, thus providing some definite upper time limit for the post--Paleozoic geolynamic processes of the Yangtze and NorthChina plates.

关 键 词：花岗岩 构造运动 钾 氩 等时年龄 

分 类 号：P588.121[天文地球—岩石学] P597[天文地球—地质学]