西北地质2012，Vol.45Issue(1)：94-101,8.
祁漫塔格韧性剪切带中绢云母40Ar-39Ar定年及地质意义
40Ar-39Ar Dating of the Muscovite in the Sericite of the Qimantage Ductile Shear Zone and Its Geological Significance
摘要
Abstract
Qimantage ductile shear zone is the main tectonic boundary of Qimantage ophiolite belt and North Kunlun magmatic arc, we determine granitic mylonite in shear zone with sericite 40Ar-39 Ar meth-ods. Plateau age is 271. 1 ± 2. 2Ma,36 Ar/40 Ar-39 Ar/40 Ar reverse-isochron curve age is 270. 5 ± 3. 7 Ma (MSWD=2.7), and 39Ar/36Ar-40Ar/36Ar isochron age is 270.9±4.7Ma (MSWD = 0.22) . Plateau age 271. 1±2. 2Ma close to the age of mineral formation of sericite, it represents the formation age of Qiman-tage ductile shear zone. Through the ductile shear zone within the kinematic characteristics, dextral shear zone has the nature of Oblique filling. The formation of Qimantage ductile shear zone related Paleo-Tethys Ocean Subduction, is the remote effects of the process of Paleo-Tethys Ocean Northward subduction orog-eny.关键词
祁漫塔格韧性剪切带/花岗质糜棱岩/绢云母/40Ar-39Ar年龄Key words
Qimantage ductile shear zone/ granitic mylonite/sericite/ 40Ar-39Ar age分类
天文与地球科学引用本文复制引用
郭通珍,谈生祥,常革红,丁玉进,张志青..祁漫塔格韧性剪切带中绢云母40Ar-39Ar定年及地质意义[J].西北地质,2012,45(1):94-101,8.基金项目
中国地质调查局项目“青海1∶5万乌兰乌珠尔—祁漫塔格地区八幅区域地质调查”(1212010610312) （1212010610312）
