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引用本文:李亚林1 李三忠2 张国伟3. 秦岭勉略缝合带组成与古洋盆演化[J]. 中国地质, 2002, (2): 129-134.
LI Ya-lin1, LI San-zhong2, ZHANG Guo-wei3. Composition of the Mianlue suture zone and its relation with the evolution of the old oceanic basin[J]. Geology in China, 2002, (2): 129-134(in Chinese with English abstract).
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秦岭勉略缝合带组成与古洋盆演化
李亚林1 李三忠2 张国伟31,2,3
1.1.成都理工学院沉积地质研究所,四川 成都 610059;2.2.青岛海洋大学,山东 青岛 266003;3.3.西北大学,陕西 西安 710069
摘要:
提要:秦岭勉略构造带是典型的蛇绿构造混杂岩带,带内组成复杂、变形强烈,其主导构造样式表现为以一系列北倾逆冲断层为格架,不同岩片推覆叠置的叠瓦状构造。详细的组成及构造研究表明,缝合带由洋盆形成演化不同阶段、不同性质的陆缘沉积岩系、不同类型蛇绿岩以及洋盆俯冲—碰撞造山过程中以不同方式出露的构造岩块组成,同时区域地层对比表明勉略古洋盆形成过程具有自西而东“剪刀式”打开扩展的性质与特点。
关键词:  秦岭  勉略缝合带  蛇绿岩  古洋盆  演化
DOI:
分类号:
基金项目:国家自然科学基金项目(49732080)资助。
Composition of the Mianlue suture zone and its relation with the evolution of the old oceanic basin
LI Ya-lin1, LI San-zhong2, ZHANG Guo-wei31,2,3
1.Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China;2.University of Qingdao, Qingdao 266003, Shandong China;3.Northwest University, Xi'an 710059, Shaanxi, China
Abstract:
Abstract: The Mianlue suture zone is a typical ophiolitic-tectonic mélange belt. All the rocks have undergone strong deformation and metamorphism; so the composition of the belt is complex. The dominant tectonic style is marked by an imbricate structure characterized by overlapping of different thrust sheets with a series of north-dipping thrust faults as the framework. Study of its detailed composition and structure suggests that the suture zone is composed of continental-margin sedimentary sequences of different natures formed in different stages of formation and evolution of the oceanic basin, different types of ophiolite and tectonic blocks exposed in different modes during the subduction -collisional orogeny of the oceanic basin. Besides, regional stratigraphic correlation indicates that the formation of the Mianlue oceanic basin is characterized by east-directed "scissors-type" opening and propagation.
Key words:  Qinling  Mianlue suture zone  ophiolite  old oceanic basin  evolution