西南天山乌什北山地区逆冲推覆构造的识别及大地构造意义

查显锋; 陈锐明; 辜平阳; 胡朝斌; 庄玉军

西南天山乌什北山地区逆冲推覆构造的识别及大地构造意义

1.
中国地质调查局西安地质调查中心，西安 710054
2.
中国地质调查局造山带地质研究中心，西安 710054

基金项目:

中国地质调查局项目 DD20160060

中国地质调查局项目 DD20160002

国家科技支撑专题 2015BAB05B01-01

青海阿尔金1:5万打柴沟等6幅区调 1212011121193

详细信息

作者简介:
查显锋(1984-), 男, 助理研究员, 主要从事区域地质、构造地质学研究。E-mail: zha_xianfeng@126.com

中图分类号: P542
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- 被引次数: 0
出版历程
- 收稿日期: 2016-10-21
- 刊出日期: 2017-04-01

THE RECOGNITION OF THRUST NAPPE STRUCTURE AND ITS TECTONIC SIGNIFICANCE IN BEISHAN AREA, WUSHI COUNTY, SOUTHWESTERN TIANSHAN

1.
Xi'an Center of Geological Survey, CGS, Xi'an 710054, Shannxi, China
2.
Orogen Research Center of China Geological Survey, Xi'an 710054, Shannxi, China

摘要

摘要: 合理厘定西南天山构造属性，不仅对天山大地构造单元的准确划分具有重要科学意义，而且对中亚造山带的古生代构造演化也至关重要。通过对西南天山乌什北山地区的地质填图和构造解析，识别出5期构造变形，包括2期逆冲推覆构造。对主期逆冲推覆构造进行几何学、运动学研究表明，该逆冲推覆构造在空间上具有由北向南逆冲的运动学指向，并由北向南表现出由逆冲推覆构造的根带向前锋带变化的构造样式。根据逆冲推覆构造的物质组成及变形样式，认为西南天山乌什北山一带应属于塔里木板块北缘逆冲推覆构造带，从而为区域构造单元划分及西南天山晚古生代以来的构造演化过程提供构造变形方面的依据。
- 逆冲推覆构造 /
- 构造单元划分 /
- 构造解析 /
- 西南天山
Abstract: Reasonably defining the tectonic attributes of Sorthwestern Tianshan not only has important scientific significance and practical value to the accurate division of Tianshan tectonic units, but also plays an importantrule in revealing the tectonic evolution during Paleozoic in Central Asian orogenic belt. Based on geological mapping and field structure analysis in Beishan area, Wushi County, Southwestern Tianshan, 5-phase deformation is recognized, including 2-phase thrust structures. The geometry and kinematics studies of the main thrust nappe structure prove that the thrust nappe structure yield with N-S direction. The structural deformation style of the thrust nappe can be established, and it presents root zone to front zone of nappe from north to south. According to the material composition and deformation features of thrust nappe structure, we think that Beishan area should be classified into the thrust nappe structure in north margin of Trim Plate in Paleozoic. It may provide deformational information for understanding the regional tectonic units division as well as the tectonic evolution in Southwestern Tianshan since Neopaleozoic.
- thrust nappe structure /
- division of tectonic units /
- structure analysis /
- Southwestern Tianshan

HTML全文

图 1 西南天山构造单元划分^[13]

1—前寒武纪基底; 2—下古生界; 3—增生楔; 4—上古生界; 5—岩浆岩; 6—中生界; 7—新生界；8—研究区位置①—那拉提山北坡断裂; ②—中天山南缘断裂; ③—塔里木北缘断裂; ④—费尔干纳断裂

Figure 1. Division of structural units in southwestern Tianshan

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图 2 乌什北山地区构造地质简图

Figure 2. Structural sketch map of Beishan, Wushi area

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图 3 西南天山乌什北山地区不同构造部位的构造变形特征

a—薄层灰岩紧闭同斜褶皱构成的叠瓦构造; b—岩性差异层强烈的顺层剪切作用; c—糜棱岩中大理岩碎斑的波状消光; d—走滑剪切带中的构造透镜体(平面，指示左行走滑); e—截切早期面理的雁列状张节理，并被方解石脉充填; f—西域砾岩北侧发育的构造破碎带; g—西域组砾岩北侧产状陡立; h—库车组发育的宽缓褶皱

Figure 3. Deformation features in different structural positions in Beishan, Wushi area, southwestern Tianshan

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图 4 依盖尔别勒萨依库车组—西域组构造剖面

Figure 4. Sturctural profile of Kuche Xiyu formation in Yigaierbielesayi

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图 5 西南天山构造带构造变形样式及不同部位构造变形特征

图 a-薄层灰岩-粉砂岩中发育的中常褶皱；图 b-褶皱一翼薄层粉砂岩中发育的褶皱劈理强烈置换层理（铅笔方向示S₀，记录本方向示S₁）；图 c-薄层灰岩中的紧闭同斜褶皱-断裂带构成的叠瓦构造；图 d-顺层剪切变形

Figure 5. Deformation styles and structural features in different position in southwestern Tianshan tectonic belt

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图 6 西南天山石炭系中发育的不同尺度的褶皱构造

Figure 6. Folds at different scales of Carboniferous in southwestern Tianshan

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