全球早古生代造山带(Ⅱ):俯冲-增生型造山  

Global Early Paleozoic Orogens(Ⅱ):Subduction-Accretionary-Type Orogeny

作　　者：李三忠[1,2,3] 杨朝[1,2] 赵淑娟[1,2] 李玺瑶 索艳慧[1,2] 郭玲莉[1,2] 余珊[1,2] 戴黎明[1,2] 李少俊[1,2] 牟墩玲 

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266100 [2]海底科学与探测技术教育部重点实验室,山东青岛266100 [3]青岛海洋科学与技术国家实验室海洋地质功能实验室,山东青岛266100

出　　处：《吉林大学学报（地球科学版）》2016年第4期968-1004,共37页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金重大项目(41190072;41190070;U1606401);国家杰出青年基金项目(41325009);泰山学者特聘教授项目;鳌山卓越科学家计划项目~~

摘　　要：全球早古生代增生造山带极其发育,主要分布在古亚洲洋南北两侧、Iaeptus洋南侧、Rheic洋北侧和环冈瓦纳大陆地带,其中原特提斯洋封闭的产物主要发育在中国境内,大量微陆块在早古生代可能都是冈瓦纳北缘的俯冲-增生带中的重要组成。增生造山带中组成复杂,具有沟-弧-盆体系、海山、洋壳等残存记录,尤以榴辉岩发育为特征,增生造山成为早古生代古亚洲洋和特提斯洋构造体系的显著独特特征。早古生代末中亚早古生代造山带多为微陆块增生造山阶段,沟-弧-盆体系发育,具有增生-软碰撞造山的特点,发生时限较晚,为早古生代末;原特提斯洋中的西昆仑、东昆仑、柴达木北缘、南阿尔金、北阿尔金与北祁连、北秦岭等围限或夹杂的微陆块在早古生代具有相同的增生造山过程,整体是向南俯冲线性增生到冈瓦纳大陆北缘,现今多次重复是早古生代弯山构造所致。400 Ma左右,南部古特提斯洋和北部勉略带的打开,导致其北漂,经复杂变形改造,它们现今为一巨型弯山构造横亘在中国中部,对中国构造格局影响最为重要。Global Early Paleozoic accretionary orogenic belts extremely developed and mainlydistributed in the north and south sides of the Paleo-Asian Ocean,north of Rheic Ocean,south of Iapetus Ocean and peri-Gondwana continent,the accretion related to the proto-Tethyan closing mainly developed within the territory of China,a large amount of micro-continental blocks in the Early Paleozoic may be an important component of the northern margin of the Gondwana subductionaccretionary zone.Accretionary orogenic belt is complex in composition,including the trench-arc-basin system,seamounts,oceanic crust and other relic geological records.Especially eclogite is common.Accretionary orogenic belts are remarkable and unique characteristics of Early Paleozoic Paleo-Asian Ocean and Tethyan tectonic domains.In late Early Paleozoic,the central Asian Orogenic belt was under the accretion of the micro-continental blocks and the trench-arc-basin system developed with the characteristics of the accretionary-weak collisional orogenic processes at the end of the Early Paleozoic.The west and east Kunlun Mountains,north margin of the Qaidam basin,south Altyn Tagh Mountain,north Altyn Tagh,north Qilian and north Qinling,some involved micro-continental blocks in the ProtoTethyan Ocean as one single linear island arc have the same accretionary orogenic processes in the Early Paleozoic.They overall subducted southward under and accreted to the northern margin of Gondwana.Their curved shape of these accretionary belts was reworked into one orocline by multiple-stage deformation.After 400 Ma,the paleo-Tethyan Ocean to the south and the Mianlue Ocean to the north opened,resulting in the drifting and complex deformation reworking as a giant orocline in Central China.It has very important influence on the tectonic outline in China.

关 键 词：早古生代 俯冲增生造山带 微陆块 原特提斯洋 古亚洲洋 环冈瓦纳 

分 类 号：P542.2[天文地球—构造地质学]