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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
投稿时间:2016-10-21    点此下载全文
引用本文: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[J].地质力学学报,2017,23(2):243-252
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作者单位
查显锋 中国地质调查局西安地质调查中心, 西安 710054;中国地质调查局造山带地质研究中心, 西安 710054 
陈锐明 中国地质调查局西安地质调查中心, 西安 710054 
辜平阳 中国地质调查局西安地质调查中心, 西安 710054 
胡朝斌 中国地质调查局西安地质调查中心, 西安 710054 
庄玉军 中国地质调查局西安地质调查中心, 西安 710054 
基金项目:中国地质调查局项目(DD20160060,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)
中文摘要: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。
中文关键词:逆冲推覆构造  构造单元划分  构造解析  西南天山
 
THE RECOGNITION OF THRUST NAPPE STRUCTURE AND ITS TECTONIC SIGNIFICANCE IN BEISHAN AREA, WUSHI COUNTY, SOUTHWESTERN TIANSHAN
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.
keywords:thrust nappe structure  division of tectonic units  structure analysis  Southwestern Tianshan
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