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本文将参加年度优秀论文评选,如果您觉得这篇文章很好,请投下您宝贵的一票,谢谢! 支持(0)   不支持(0)

乌什 – 阿克苏地区新元古代蓝片岩地体构造变形特征
投稿时间:2020-09-01  修订日期:2020-10-26  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2021055
摘要点击次数: 58
全文下载次数: 101
作者单位地址
王富军 内生金属矿床成矿机制研究国家重点实验室南京大学 南京市栖霞区仙林大道163号
陆远志 中国地质调查局南京地质调查中心 
郑碧海 内生金属矿床成矿机制研究国家重点实验室南京大学 
葛荣峰 内生金属矿床成矿机制研究国家重点实验室南京大学 
刁志鹏 内生金属矿床成矿机制研究国家重点实验室南京大学 
朱文斌 内生金属矿床成矿机制研究国家重点实验室南京大学 南京市栖霞区仙林大道163号
基金项目:国家重点研发项目(编号:2018YFC0603703和 2017YFC0601402)
中文摘要: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的限定。其中,第一期次的变形时间为ca. 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ca. 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。
中文关键词:乌什 – 阿克苏地区  前寒武纪  蓝片岩地体  构造变形  年代学框架
 
Deformation features of the Neoproterozoic blueschists terrane in the Wushi – Aksu area
Author NameAffiliationAddress
WANG Fujun State Key Laboratory for Mineral Deposits Research Nanjing University,Institute of Continental Geodynamics,School of Earth Sciences and Engineering,Nanjing University 南京市栖霞区仙林大道163号
LU Yuanzhi Nanjing Center,China Geological Survey 
ZHENG Bihai State Key Laboratory for Mineral Deposits Research Nanjing University,Institute of Continental Geodynamics,School of Earth Sciences and Engineering,Nanjing University 
GE Rongfeng State Key Laboratory for Mineral Deposits Research Nanjing University,Institute of Continental Geodynamics,School of Earth Sciences and Engineering,Nanjing University 
DIAO Zhipeng State Key Laboratory for Mineral Deposits Research Nanjing University,Institute of Continental Geodynamics,School of Earth Sciences and Engineering,Nanjing University 
ZHU Wenbin State Key Laboratory for Mineral Deposits Research Nanjing University,Institute of Continental Geodynamics,School of Earth Sciences and Engineering,Nanjing University 南京市栖霞区仙林大道163号
Abstract:The Wushi – Aksu area, located in the Northwest margin of the Tarim Craton, preserves one of the few Precambrian blueschists terranes in the world that are well-preserved well-substantiated. According to the previous researches, the blueschists terrane in the Aksu area experienced four phases of deformation during and after the subduction and exhumation of the blueschists terrane. Nonetheless no research on tectonic deformation characteristics of blueschists terrane in the Wushi area has been processed. In this paper, we performed systematic observation, measure, analysis and comparison on tectonic deformation characteristics of the blueschists terrane from both the Aksu and Wushi areas. We concluded that tectonic deformation characteristics of the blueschists terrane from both areas are basically the same, which can both be divided into four phases. Meanwhile, there are some differences between the blueschists terrane from the Aksu and Wushi areas in terms of details within each phase. Furthermore, basing 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 blueschists 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 blueschists 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 Meso-Cenozoic to the southern edge of the Asian plate.
keywords:Wushi – Aksu area  Precambrian  blueschists terrane  tectonic deformation  chronological framework
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