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地质力学学报:2010,16(1):51-58
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东昆仑左行走滑韧性剪切带形成时代的锆石U-Pb 年龄证据
(1.中国地质大学地球科学与资源学院,北京 100083;2.中国地质科学院地质力学研究所,北京 100081)
EVIDENCE OF ZIRCON U-Pb AGES FOR THE FORMATION TIME OF THE EAST KUNLUN LEFT-LATERAL DUCTILE SHEAR BELT
(1.College of Earth Science and Resources,China University of Geosciences,Beijing 100083,China;2.Institute of Geomechanics,Chinese Academy of Geological Science,Beijing 100081,China)
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投稿时间:2009-12-18    
中文摘要: 巴颜咯拉—松潘甘孜地体与东昆仑南地体晚三叠纪斜向碰撞形成大规模的东昆仑左行走滑韧性剪切带,新生代时期韧性剪切转为脆性左旋走滑并构成青藏高原向东逃逸的北部边界。为了确定早期韧性剪切变形时代,对剪切带上2 个同构造花岗斑岩脉进行了激光探针(LA-MC-ICP MS) 测年研究,获得了196.4 ± 2.3 Ma和195.1 ± 1.6 Ma 的锆石206Pb/238U 加权平均年龄,表明东昆仑左行走滑韧性剪切带形成于燕山早期。
Abstract:The large-scale East Kunlun left-lateral ductile shear belt was formed by an oblique collision between the Bayan Har-Songpan-Ganzi terrain and the southern East Kunlun terrain during the Late Triassic.During the Cenozoic,this ductile shear belt was transformed into a brittle leftlateral strike-slip belt,and became the north boundary for the eastward“escape”of the Qinghai- Tibet Plateau.The La-MC-ICPMS dating for two syntectonic granite-porphyry veins in the large ductile shear belt yielded two weighted zircon 206Pb/238U ages of 196.4 ± 2.3 Ma and 195.1 ± 1.6 Ma.These ages suggest that the East Kunlun left-lateral ductile shear belt should form during the early Yanshanian Movement.
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基金项目:中国地质调查局项目(编号: 1212010711510) 资助。
引用文本:
张紫程,张绪教,高万里,等,2010.东昆仑左行走滑韧性剪切带形成时代的锆石U-Pb 年龄证据[J].地质力学学报,16(1):51-58.DOI:
ZHANG Zi-cheng,ZHANG Xu-jiao,GAO Wan-li,et al,2010.EVIDENCE OF ZIRCON U-Pb AGES FOR THE FORMATION TIME OF THE EAST KUNLUN LEFT-LATERAL DUCTILE SHEAR BELT[J].Journal of Geomechanics,16(1):51-58.DOI:

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