青藏高原北缘首次获得格林威尔期造山事件同位素年龄值  

GRENVILLE OROGENY IN NORTH OF THE QINGHAI-TIBET PLATEAU: FIRST EVIDENCE FROM ISOTOPIC DATING

作　　者：张传林[1] 赵宇[1] 郭坤一[1] 董永观[1] 王爱国[1] 

机构地区：[1]国土资源部南京地质矿产研究所,南京210016

出　　处：《地质科学》2003年第4期535-538,共4页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：中国地质调查局"中国前寒武纪重大地质问题研究"( 2 0 0 1 1 3 90 0 0 70 );课题"西昆仑前寒武纪构造事件群研究"专题资助

摘　　要：对西昆仑北缘中元古代变质双峰式火山岩中变质矿物角闪石和黑云母进行Ar Ar测年 ,获得角闪石理想的坪年龄为 1 0 5 0 .85± 0 .93Ma ,黑云母理想的坪年龄为 1 0 2 1± 1 .0 8Ma。这是在青藏高原北缘首次获得的格林威尔期造山事件同位素年代学的可靠证据 ,为研究该区中 新元古代构造演化。The hornblende and biotite from the metamorphic bimodal volcanic rocks in north margin of the Western Kunlun yielded 10 50.85±0.93 Ma and 1 021±1.08 Ma perfect Ar plateau ages of the hornblende and biotite respectively. It was the first time to get evidence of isotopic dating for the Grenville orogeny in north margin of the Qinghai Tibet (Xizang) Plateau, which supplied new geological constraints for study on the Meso Proterozoic and Neo Proterozoic evolution of Western Kunlun and location of the Tarim plate in the Rodinia supercontinent.

关 键 词：青藏高原北缘 格林威尔期造山事件 同位素年龄值 Ar-Ar测年 

分 类 号：P597[天文地球—地球化学]