| 大陆边缘反S状造山带三维模式兼论青藏高原结构与隆升 |
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| 引用本文： | 李东旭.大陆边缘反S状造山带三维模式兼论青藏高原结构与隆升[J].地质力学学报,2007,13(1):31-41. |
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| 作者姓名： | 李东旭 |
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| 作者单位： | 中国地质大学,北京,100083 |
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| 摘 要： | 文中根据北美大陆西南边缘造山带的构造地貌及新构造运动特征,建立了反S状大陆边缘造山带的三维构造力学模式,指出阿拉斯加地区为弧形右旋剪切隆升造山带;科迪勒拉造山带为直线右旋走滑造山带;马德雷山以南,延至加勒比海为一左旋沉降‘旋扭沟-弧-盆系统’。以此模式检验欧亚大陆南缘造山带,确定从阿尔卑斯经扎格罗斯、喜马拉雅至印度尼西亚蜿蜒曲折的山链是由四个反S状造山带连锁而成,导致它们的分解为四个构造体系的原因,与南半球冈瓦纳大陆裂解有关。依据上述的区域构造规律,作者认为青藏高原内部结构的原型为旋扭沟-弧-盆系统,属帕米尔—喀喇昆仑—喜马拉雅反S状造山带尾弧的组成部分。后经印度板块俯冲、青藏—三江—印度尼西亚反S状造山带头部弧右旋隆升两组动力系统叠加结果。
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| 关 键 词： | 反S状旋扭造山带 旋扭沟—弧—盆系统 青藏高原结构与隆升 大陆边缘造山带 |
| 文章编号： | 1006-6616（2007）01-0031-11 |
| 收稿时间： | 2007-01-08 |
| 修稿时间： | 2007年1月8日 |
3D MODEL OF REVERSED S-SHAPED OROGENIC BELTS ON THE CONTINENTAL MARGIN: WITH A DISCUSSION OF THE INTERNAL STRUCTURE AND UPLIFT OF THE QINGHAI-TIBET PLATEAU |
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| LI Dong-xu.3D MODEL OF REVERSED S-SHAPED OROGENIC BELTS ON THE CONTINENTAL MARGIN: WITH A DISCUSSION OF THE INTERNAL STRUCTURE AND UPLIFT OF THE QINGHAI-TIBET PLATEAU[J].Journal of Geomechanics,2007,13(1):31-41. |
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| Authors: | LI Dong-xu |
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| Institution: | China University of Geosciences, Beijing 100083, China |
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| Abstract: | According to the tectono-geomorphological features and characteristics of neotectonic movement on the southwestern margin of the North American continent,the author has established a 3D tectonomechanic model of the reversed S-shaped continental-margin orogenic belt of the northern hemisphere.This zigzag orogenic belt extends from Alaska through the Cordillera to the Caribbean and may be divided into three sections:(1) the Alaska region,which,as a head arc,is an arcuate dextral shear uplifted orogenic belt;(2) the Cordillera orogenic belt,which as a middle section,is a straight dextral strike-slip orogenic belt; and(3) the region from south of the Madre Mountains to the Caribbean Sea,which,as a tail arc,is a sinistral transrotational "trench-arc-basin system".The author used this model to check the orogenic belts on the southern margin of the Eurasian continent and ascertained that the zigzag mountain chain from the Alps through Zagros and Himalaya to Indonesia is composed of four connected reversed S-shaped orogenic belts.The cause for their decomposition into four separate tectonic systems is related to the breakup of the supercontinent Gondwana in the southern hemisphere.According to the above-mentioned regional tectonic characteristics,the author thinks that the original internal structure of the Qinghai-Tibet Plateau was a transrotational trench-arc-basin system,belonging to the tail arc of the Pamir-Karakorum-Himalaya reversed S-shaped orogenic belt. Later it underwent the superimposition of two dynamic systems,the subduction of the Indian plate and the dextral shear and uplift of the head arc of the Qinghai-Tibet-Sanjiang-Indonesia reversed S-shaped orogenic belt. |
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| Keywords: | reversed S-shaped transrotational orogenic belt rotational trench-arc-basin system structure and uplift of the Qinghai-Tibet Plateau continental-margin orogenic belt |
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