大别山碧溪岭榴辉岩激光探针^(40)Ar-^(39)Ar年龄  

LASER POROBE ^(40)Ar-^(39)Ar ISOCHRON AGE OF ECLOGITE FROM BIXILING, DABIE UHP OROGENIC BELT

作　　者：胡世玲[1] 郝杰[1] 李曰俊[1] 戴橦谟 蒲志平 

机构地区：[1]中国科学院地质研究所,北京100029 [2]中国科学院广州地球化学所,广州510640

出　　处：《地质科学》1999年第4期427-431,共5页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金资助项目

摘　　要：采用激光探针 40 Ar- 39Ar法对大别山碧溪岭榴辉岩样品中的石榴石和绿辉石单颗粒矿物进行原位测定 ,获得了两条等时线年龄。结果表明该区榴辉岩经历了两期构造热事件 :榴辉岩超高压变质作用发生在加里东期 ,燕山期年龄为快速抬升折返的热事件年代记录。In this paper, 40 Ar- 39 Ar data has been obtained on garnet and omphosite from eclogite samples using laser probe. Two 40 Ar- 39 Ar isochron ages have been determined this way. They are 400 Ma and 164 Ma respectively. The age data show that the Bixiling eclogite subjected to two phases of tectono-thermal events. The ultra-high pressure metamorphism took place in Caledonian, and the rapid uplift occurred during Yanshanian.

关 键 词：大别山 碧溪岭 榴辉岩 激光探针 氩40-氩39 

分 类 号：P588.3[天文地球—岩石学] P597[天文地球—地质学]