| 中国北方中生代逆冲推覆构造研究进展 |
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| 引用本文：李智超,施炜,熊小松,吴国炜.2022.中国北方中生代逆冲推覆构造研究进展[J].地球学报,43(6):858-874. |
| DOI：10.3975/cagsb.2022.100301 |
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| 基金项目:国家自然科学基金(编号: 41774114; 41590863; 41574093);中国地质调查局项目(编号: DD20190011; DD20179342; DD20160083);国家重点研发计划课题(编号: 2016YFC0600302) |
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| 中文摘要:推覆构造是陆内构造变形中地壳缩短的重要方式之一, 是记录盆山结合带-造山带形成演化过程的重要载体。中国北方位于中亚造山带南部及周缘地区, 分布了多个逆冲推覆构造带。本文通过对这些推覆构造相关的几何学、运动学和年代学等资料的综合收集分析, 梳理了中国北方众多中生代逆冲推覆构造的时空展布特征、形成时代及形成机制等。在空间展布上, 这些推覆构造沿中国北方近东西向展布, 推覆距离几十~几百公里不等, 属于浅层次脆性变形。在形成时代上, 这些推覆构造的时代可以和燕山运动主挤压变形期相对应, 分为早(170~160 Ma)和晚(150~135 Ma)两期。在动力学机制上, 本文将推覆体可分为东西两段, 西段主体的逆冲方向为北东—南西向, 可能受控于鄂霍次克洋闭合和班公湖—怒江缝合带闭合的综合影响; 东段主体逆冲方向为北西—南东向, 可能主要受控于鄂霍茨克洋的闭合与古太平洋板块俯冲的远程应力影响。 |
| 中文关键词:陆内变形 推覆构造 东亚多板块汇聚 晚中生代 中国北方 |
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| Review of Mesozoic Thrust Nappe Structures in Northernmost China |
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| Abstract:Nappe structures are a key way to accommodate intracontinental crustal shortening, and record the formation and evolution of basin-range conjunction belts. Numerous thrust nappe structures have developed in northernmost China. In this study we integrated geometric, kinematic, and geochronological data, and then scaled the spatial and temporal distribution characteristics, age, and formation mechanisms of the nappe structures in northernmost China. The nappe structures are east-west trending and distributed along the China-Mongolia border with nappe distances ranging from tens to hundreds of kilometers. The formation ages of the nappe structures can be separated into early (170–160 Ma) and late (150–135 Ma) formation stages, which correspond to the main extrusion-deformation stage of the Yanshan Movement. The thrust direction of the western segment is predominantly NE–SW, which may have been controlled by the closure of the Okhotsk Ocean and the formation of the Bangong–Nujiang suture zone. The main thrust direction of the eastern segment is NW–SE, which was likely controlled by the closure of the Okhotsk Ocean and the far-field stress caused by the subduction of the Paleo-Pacific plate. |
| keywords:intracontinental deformation nappe structure multi-plate convergence in East Asia Late Mesozoic northernmost China |
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