ISSN 1009-6248CN 61-1149/P 双月刊

主管单位：中国地质调查局

主办单位：中国地质调查局西安地质调查中心
中国地质学会

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    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
    • 摘要: 祁漫塔格韧性剪切带是祁漫塔格蛇绿混杂岩带与北昆仑岩浆弧的区域主构造边界,对剪切带内花岗质糜棱岩中绢云母40Ar-39Ar法年龄测定,获得了(271.1±2.2)Ma的坪年龄,相应的36Ar/40Ar-39Ar/40Ar反等时线年龄为(270.5±3.7)Ma(MSWD=2.7),39Ar/36Ar-40Ar/36Ar正等时线年龄为(270.9±4.7)Ma(MSWD=0.22);坪年龄(271.1±2.2)Ma接近于绢云母矿物的形成年龄,也代表了祁漫塔格韧性剪切带的形成年龄。通过韧性剪切变形带内运动学特征的研究,表明剪切带具有右旋斜冲的性质。祁漫塔格韧性剪切带的形成与古特提斯洋的俯冲作用有关,是古特提斯洋向北俯冲造山过程的远程效应。

       

      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-39Ar methods.Plateau age is 271.1±2.2Ma,36Ar/40Ar-39Ar/40Ar 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 Qimantage 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 orogeny.

       

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