| 东天山古生代板块构造特点及其演化模式 |
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| 引用本文： | 方国庆.东天山古生代板块构造特点及其演化模式[J].甘肃地质学报,1994,3(1):34-40. |
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| 作者姓名： | 方国庆 |
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| 作者单位： | 中国科学院兰州地质研究所 |
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| 摘 要： | 东天山的古板块构造格局主要由塔里木陆壳板块、西伯利亚陆壳板块和哈萨克斯坦洋壳板块在古生代的活动所奠定的。在古生代，东天山的板块构造格局主要表现为多列岛弧及其间弧间盆地和弧后盆地的形式。自北而南依次发育：博格达－哈尔里克泥盆－石炭纪岛弧，吐哈弧间盆地，觉罗塔格泥盆－石炭纪岛弧，吐哈弧间盆地，觉罗塔格泥盆－石炭纪岛弧，中天山志留－石炭纪岛弧，南天山－红柳河弧后盆地和北山陆缘裂谷带。其主要成因是由于准噶尔洋壳板块向塔里木陆壳板块下俯冲，俯冲带不断后退所形成的。奥陶纪中后期，中天山由塔里木北缘分出，形成具有古老陆块基底的类似于现今日本列岛的中天山岛弧。在其后形成南天山－红柳河弧后盆地和北山陆缘裂谷带。泥盆纪早期，俯冲带后退至觉罗塔格北侧形成觉罗塔格岛弧。泥盆纪晚期，俯冲带后退至博格达－哈尔里克北缘，形成博格达－哈尔里克岛弧。中石炭世至早二叠世，博格达同准噶尔陆块碰撞造山，哈尔里克同麦钦乌拉岛弧碰撞造山。与此同时，南天山－红柳河弧后盆地和北山裂谷带也相继闭合，而吐哈弧间盆地则成为未被消减完的弧间盆地残留下来。东天山古生代板块演化可与现今印度尼西亚地区的板块演化相类比。
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| 关 键 词： | 东天山 古板块 岛弧 弧间盆地 弧后盆地 |
PALEOZOIC PLATE TECTONICS OF EASTERN TIANSHAN MOUNTAINS XINJIANG,AHINA |
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| Fang Guoqing.PALEOZOIC PLATE TECTONICS OF EASTERN TIANSHAN MOUNTAINS XINJIANG,AHINA[J].Acta Geologica Gansu,1994,3(1):34-40. |
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| Authors: | Fang Guoqing |
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| Institution: | Fang Guoqing(Lanzhou Institute of Gcology,Academia Sinica Lanzhou 730000) |
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| Abstract: | Paleoplate tectonic framwork of Eastern Tianshan mountains was formed by Tarim continentalplate,Siberia continentalplate and Kazakhstan oceanic Plate during the Paleozoic movements.It isCharacterized by many island arcs,interarc basins and backarc basin. They are,from north to south,Bogda-Harlic island arc(D-C),Tuha(Turpan-Hami) interarc basin,Juelotag island arce(D-C),Mid-dle Tianshan are(S-C),South Tianshan-Hongliuhe backarc basin,and Beishan epicontinental riftzone whose wereformed by the subductions of Junggar oceanic plate under Tarim Continental plateand the recession of subductionzones during the middle-late Ordovician,the middle Tianshan was sep-arated from the north margin of Tarim plate to form the middle Tianshan arc with ancient continentalbasement and all of which is similar to that of Japan islands. Then,the south Tianshan- Hongliuhebackarc basin and Beishan epicontinental rift zone were formed,During the early Devonian,the rcces-sion of sutxluction zone to the north of Juelotag formed Juelotag island arc, During the late Devoni-an,the recession of subduction zone to the north margin of Bogda-Harlic formed Bogda-Harllic islandarc. From the middle Carboniferous to early Permain Bogda island arc collided with Junggar Miccon-tinental plate and Harlic islan d arc did with Maiainwula island arc.About at the some time,SouthTianshan-Hongliuhe backarc basin and Beishan rift zone clased subeequently,but Tuha interarc basinremained,which was not subducted. The evolutions of Paleozoic easternTianshan plate tectonics may be compared with that of theplate tectonics of Indonesian region. |
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| Keywords: | Eastern Tianshan Paleoplate Island arc Interarc basin Backarc basin |
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