EVIDENCE OF ZIRCON U-Pb AGES FOR THE FORMATION TIME OF THE EAST KUNLUN LEFT-LATERAL DUCTILE SHEAR BELT
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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 QinghaiTibet 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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Key words:
- ductile shear belt /
- zircon U-Pb age /
- Early Yanshan Movement /
- East Kunlun orogenic
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表 1 纳赤台地区同构造花岗斑岩锆石U-Pb同位素分析表
Table 1. U-Pb data of zircons from syn-tectonic porphyry in Naij Tal area
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