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辽西地区中生代板内造山作用
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摘要
辽宁省西部属于低山丘陵区,为著名的燕山山脉之东段。大地构造位置属华北陆块区,北邻兴蒙古生代造山带。
     本文是从区内前中生代地质构造背景入手,分别对区内构造格局、裂陷与伸展作用、挤压与收缩作用等方面进行了详细论述,总结了板内造山带构造的基本特征,探讨了辽西型板内造山过程及形成机制。
     区内中生代构造变形、岩浆活动强烈,且远离该时期的板块边缘,与其西邻的燕山地区相似,是一种特殊类型的板内造山带。它是在前寒武纪克拉通基础上发育起来的;前中生代经历了太古宙-古元古代结晶基底形成、中新元古代拗拉槽和古生代(包括部分三叠系)克拉通稳定盖层发育三个阶段;中生代开始地壳活化,构造运动和岩浆活动强烈,进入了板内造山作用阶段。早期构造演化属于古亚洲构造域,中生代中晚期属于太平洋构造域;在早期近东西向的构造-岩浆岩带之上叠加了中生代晚期新生的北北东向构造-岩浆岩带,又叠加了许多以结晶基底和中酸性侵入岩为核的垂向隆升构造,构成了本区中生代基本构造格局。
     辽西中生代时期地壳运动强烈,伸展和收缩作用多期交替;以近东西向和北东向-北北东脆性断裂所控制的、由隆起和盆地相间分布的盆岭构造和多期次褶皱及逆冲断裂发育;反映了中生代早期主压应力为南北向,晚期为南东-北西向的应力场特征。此外,区内中生代岩浆活动强烈,表现为多旋回的火山喷发和岩浆侵入;在每个旋回内岩浆具有从偏基性岩到偏酸、碱性岩的演化规律;不同时期的岩浆岩呈带状分布,受同期断裂控制。
     本区在中生代时期经历了印支期、燕山期两个构造演化阶段。印支运动可划分为两个构造幕、燕山运动划分四个构造幕。本区中生代经历了始造山期、主造山早期、主造山晚期和造山期后(重造山期)的板内造山过程。其造山作用机制是复杂的、非单一的、多阶段的、多方向的;远离板块边缘,块体间的相互作用只是构成大的构造环境,地球内部物质的垂向调整、幔源物质和热流的上升是板内造山作用的主因;重力和地球自转引起的切向力是形成板内造山带表层构造的不可忽视的力源;边界力主要作用于板块的边缘及附近,而位于板内,边界力的有效传递不能解释板内的构造变形及强烈的岩浆活动,相比之下,体力的作用起到主导作用。
The western Liaoning Province is a low mountain and hills area and is the eastern extension of the famous Yanshan mountain chain. It is located in the North China craton and is adjacent to the XingMeng Paleozoic orogenic belt on the north.
     The paper researches the background of geological structures of the Pre-Mesozoic in the western Liaoning. The tectonic framework, taphrogeny and extension, compression and constriction are discussed in detail. The characteristics of the intraplate orogenic belt is summarized. The intraplate orogenic processes and formative mechanism of the western Liaoning type are also discussed.
     The intensive tectonic deformation and magmatic activity of the Mesozoic in the western Liaoning, and the location far from the margin of the plate suggest that it is a type of the intraplate orogenic belt, like to the Yanshan area. The intraplate orogenic belt is developed on the Pre-Cambrian cratonic basement.It undergo three tectonic phases, i.e. formation of the crystalline basement of Archean-Paleoproterozoic, the aulacogen of Mesoproterozoic-Neoproterozoic and the cratonic stable cover of paleozoic( including partial Triassic). The crust was remobilization, the tectonic movement and magmatic activity were intensive in the Mesozoic, and it entered a stage of the intraplate orogenesis. The tectonic evolution belong to ancient Asia tectonic field in the early Mesozoic, and Pacific Ocean tectonic field in the middly and later Mesozoic. The superimposition of the early east-west trending tectonic-magmatic belt by the north-to northeast trending tectono-magmatic belt of later Mesozoic and many vertical structures with the core of crystalline basement and acidic rocks is the essential tectonic framework of the Mesozoic in the western Liaoning.
     The intensive crust movement and multiphase of extension and compression development of the basin and range structures the multiphase folding and thrusting.
     Northeast-north to northeast striking faults, upheavals and basins interval distribute Mesozoic in the western Liaoning. Show stress field characteristic that the direction of main
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