乌什- 阿克苏地区新元古代蓝片岩地体构造变形特征
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本文为国家重点研发项目(编号2018YFC0603703和 2017YFC0601402)资助成果。


Deformation features of the Neoproterozoic blue schists terrane in the Wushi- Aksu area
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    摘要:

    乌什- 阿克苏地区位于塔里木克拉通西北缘,发育有世界上为数不多的且保存较为完整的典型前寒武纪蓝片岩地体。根据前人的研究,阿克苏地区的蓝片岩地体在俯冲、折返和折返后的过程中共经历了四个期次的变形,但是对于乌什地区的蓝片岩地体的构造变形特征研究目前仍为空白。本文通过对乌什与阿克苏地区的蓝片岩地体的构造变形特征进行系统的野外观察测量和室内分析对比,发现两个地区的蓝片岩地体的构造变形特征基本相似,均可以划分为四个变形期次,但各期次变形在一些细节特征上存在一定的差异。同时,结合前人最新的年代学数据,本文对乌什- 阿克苏地区蓝片岩地体构造变形期次的年代学框架进行了初步限定。其中,第一期次的变形时间约为754~750 Ma,与高压低温相的变质作用紧密相关,是蓝片岩地体俯冲的结果;第二期次变形的时间略晚于第一期变形,其形成应该与蓝片岩地体的折返过程紧密相关;第三期次变形早于基性岩墙的侵入,而晚于第二期变形,即在约750~745 Ma之间,是环Rodinia俯冲体系作用下塔里木克拉通北缘最后俯冲的结果;第四期次变形涉及到的最年轻地层为二叠系,可能与古天山洋关闭或中新生代的不同陆块碰撞增生到亚洲板块南部边缘有关。

    Abstract:

    The Wushi- Aksu area, located in the Northwest margin of the Tarim Craton, preserves one of the few Precambrian blue schist terranes in the world that are well- preserved and well- substantiated. According to the previous researches, the blue schist terrane in the Aksu area experienced four phases of deformation during and after the subduction and exhumation of the blue schists terrane. Nonetheless, no research on tectonic deformation characteristics of blue schist terrane in the Wushi area has been undertaken. In this paper, we performed systematic observation, measurement, analysis and comparison on tectonic deformation characteristics of the blue schist terrane from both the Aksu and Wushi areas. We concluded that tectonic deformation characteristics of the blue schist terrane from both areas are basically the same, and can both be divided into four phases. Meanwhile, there are some differences between the blue schist terrane from the Aksu and Wushi areas in terms of details within each phase. Furthermore, based on the latest chronological data from previous researches, we constrain the chronological framework of each phase of deformation. The first phase was ca. 754~750 Ma, which was closely related to the high- pressure and low- temperature metamorphism, and was the result of the subduction of the blue schist terrane. The second phase was a little later than the first phase and its formation should be closely related to the reentry process of the blue schist terrane. The third phase should be earlier than the invasion time of the mafic dykes and later than the second phase, that is, between ca. 750~745 Ma, which was the result of the subduction of the northern margin of the Tarim Craton under circum- Rodinia subduction system. The youngest stratum involved in the fourth phase is Permian, which may be related to the closure of the ancient Tianshan Ocean or the collision and accretion of different terranes in Mesozoic—Cenozoic to the southern edge of the Asian plate.

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王富军,陆远志,郑碧海,葛荣峰,刁志鹏,朱文斌.2021.乌什- 阿克苏地区新元古代蓝片岩地体构造变形特征[J].地质学报,95(5):1414-1425.
Wang Fujun, Lu Yuanzhi, Zheng Bihai, Ge Rongfeng, Diao Zhipeng, Zhu Wenbin.2021. Deformation features of the Neoproterozoic blue schists terrane in the Wushi- Aksu area[J]. Acta Geologica Sinica,95(5):1414-1425.

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  • 收稿日期:2020-09-01
  • 最后修改日期:2020-10-26
  • 录用日期:2021-01-13
  • 在线发布日期: 2021-02-22
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