| 塔里木盆地北缘兴地断裂构造变形特征 |
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| 引用本文： | 李相然.塔里木盆地北缘兴地断裂构造变形特征[J].新疆地质,1994(3). |
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| 作者姓名： | 李相然 |
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| 作者单位： | 烟台大学 |
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| 摘 要： | 兴地断裂发生在中元古代末期，使中元古巨厚的沉积岩发生了强烈褶皱和隆起，并伴有大量岩浆侵入和区域变质作用。在兴地断裂形成的同时，发生了第一期构造变形，其特点以韧性变形为主，由三个变形幕构成，形成了本区主要构造骨架；晚元古代本区进入晋宁期发展阶段，团结的塔里木地台基底局部裂开，形成一系列近东西向的断陷盆地，发生了第二期变形，形成以塑性变形为主的板劈理和千枚理为其特征。该期变形结束了塔里木基底发展，进入了稳定盖层沉积发展阶段；进入早古生代，兴地断裂控制了该时期的沉积作用，之后发生第三期变形，以脆性变形为主，形成一系列碎裂岩和脆性变形组构，使兴地断裂形成几十米乃至上百米宽的破碎带，从而改造了早期的糜棱岩；至中、新生代，兴地断裂再次活动，形成断裂两侧南升北降的扭动形迹。通过对兴地断裂的深入探讨，笔者认为：该断裂具有线性特征明显，活动时间漫长，构造变形复杂，是塔里木盆地北缘规模巨大的复活大断裂。
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| 关 键 词： | 塔里木盆地北缘，韧性变形，塑性变形，脆性变形，构造序列，兴地断裂 |
STRUCTURAL DEFORMATION OF XINGDI FAULT IN THE NORTHERN MARGIN OF TANIM BASIN |
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| Li Xiangran.STRUCTURAL DEFORMATION OF XINGDI FAULT IN THE NORTHERN MARGIN OF TANIM BASIN[J].Xinjiang Geology,1994(3). |
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| Authors: | Li Xiangran |
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| Institution: | Yantai University |
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| Abstract: | Xingdi Fault was formed at the end of middle Proterozoic,resulting in the intense folding and uplift of the sediments of middle Proterozoic,with a large amount of magma intrusion and regional metamorphism.The first-phase structural deformation so took place,characterhed by ductile shearing which involves 3 deformation stages and acts as the main structural skeleton.At the late Palaeozoic the study area entered Jinlin stage at which consolidated Tarim platform basement broke apart partially,resulting in a scrips of east-west fault basins The Xingdi Fault accepted the second-phase deformation,characterized by plastic deformation mainly of slaty cleavage and phyllitic cleavage.At this phase the Tarim basement entered the sedimentation Stage.At the early Palaeozoic the Xingdi Fault controlled the sedimentation,and accepted the third-phase deformation,mainly of brittle type,resulting in the occurence of a series of fragments and brittle deformation fabric.Tens to hundred-meter width fracture zone was so formed along the Xingdi Fault,and the early-stage melonnes got deformed.Up to Mesozoic and Cenozoic the Xingdi Fault reacted to form twisted traces due to the uplift in the south and subsidence in the north of the fault.The deep probe into this fault reveals that the Xingdi Fault is characterized by obvious lineation,long-term activity,tal complicated structural deformanon.It is a large-scale reactive fault in the northern margin of Tarim Basin. |
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| Keywords: | Tarim Basin ductile deformation plastic deformation brittle deformation structural sequence Xingdi Fault |
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