| 南帕米尔喀拉苏沟韧性剪切带构造变形特征及年代学分析 |
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| 关键词:southern Pamir ductile shear zone geochemistry zircon U-Pb age |
| 基金项目:中国地质调查局“特殊地质地貌区填图试点”项目(编号: DD20160060) |
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| Deformational Characteristics and Geochronological Constraints of Karasu Ductile Shear Zone in Southern Pamir |
| The Pamir western syntaxis played an important role in the tectonic evolution of the Tibetan Plateau. It experienced the complex process of the Paleozoic–Mesozoic terrane collision and was transformed by the Cenozoic Indian-Asian collision. However, the study of Mesozoic tectonic evolution in this area remains very insufficient. In this paper, according to the study of the outcrop and micro-deformation characteristics in the NW–SE-trending Karasu ductile shear zone 1.5 km wide in southern Pamir, the authors hold that the shear zone is a sinistral shear, and the shear is mainly the strike-slip component with partial thrust component. The ductile deformation exhibits a gradual weakening trend from the center to the edges. The granite in the shear zone is a syn-tectonic granite according to the morphology, deformation, geochemical characteristics and a comparison with other plutons in this region. Two zircon U-Pb isotopic ages obtained in this granite are (233.2±1.8) Ma and (235.7±1.4) Ma, which indicate that Karasu ductile shear zone was formed in the earliest Late Triassic period and that that the South Pamir block underwent significant tectonic deformation at the early stage of the closure of the Rushan Ocean. |
| ZHU Ming-wei,LIU Jian,JIANG Ke-qing,DU Xing-xing.2019.Deformational Characteristics and Geochronological Constraints of Karasu Ductile Shear Zone in Southern Pamir[J].Acta Geoscientica Sinica,40(4):588-600. |
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