| 大陆俯冲作用及青藏高原周缘造山带的崛起 |
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| 引用本文： | 许志琴,杨经绥,姜枚.大陆俯冲作用及青藏高原周缘造山带的崛起[J].地学前缘,1999(3):42. |
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| 作者姓名： | 许志琴 杨经绥 姜枚 |
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| 作者单位： | 中国地质科学院地质研究所!北京，100037 |
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| 基金项目： | 国家自然科学基金!49732070，原地质矿产部中法合作项目 |
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| 摘 要： | 青藏高原周缘造山带于新生代时崛起。周缘造山带中古老变质地体的折返与3种挤 出作用方式有关：喜马拉雅"逆冲－伸展"型挤出、祁连山"反向逆冲"型挤出和阿尔金"逆冲－转换"型挤出。据地质与地球物理综合研究推测，造山带的折返与周缘大陆岩石圈向内的俯冲作用有关：印度板块岩石圈向北俯冲至雅鲁藏布江缝合带下约 200 km处，西伯利亚板块往南低角度插入祁连山 40 km以下，塔里木地块沿阿尔金北缘边冲断层呈铲式往南俯冲于阿尔金山下100km处，扬子地块呈入体插入青藏高原东部中地壳下面。是否存在扬子地块往西运动及大陆俯冲作用尚待探究。
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| 关 键 词： | 大陆俯冲作用 青藏高原周缘造山带 隆升 折返 |
| 修稿时间： | 1999-02-08 |
大陆俯冲作用及青藏高原周缘造山带的崛起 |
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| Xu Zhiqin, Yang Jingsui, Jiang Mei, Li Haibing.大陆俯冲作用及青藏高原周缘造山带的崛起[J].Earth Science Frontiers,1999(3):42. |
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| Authors: | Xu Zhiqin Yang Jingsui Jiang Mei Li Haibing |
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| Abstract: | The orognic belts at the margin of the Qinghai - Tibet Plateau have already been u-plifting since Cenozoic. The exhumation of the old metamorphic complex in these marginal oro-genic belts is related to three types of extrusion: (1) "thrust-extension" related to extrusion ofHimalayan type; (2) "opposite thrust" related to extrusion of Qilianshan type; (3) "thrust-transformation" related to extrusion of the Altun type. On the basis of geologied and geophysi-cal study, it is postulated that the exhumation of the orogenic belts is correlated to the inwar-subduction of the continental lithosphere around the plateau, i. e. (1) the Indian plate subduct-ed northward down to about 200 km deep under the Yalung Zangbo suture zone; (2) TheSiberian plate subducted southward at a low-angle down to 40 km deep beneath the Qilianshan;(3) The Tarim terrain subducted along the northern marginal thrust fault of the Altun Moun-tain southward down to 100 km deep under the Altun Mountain; (4) The Yangtze platewedged into the middie crust of the eastern Qinghai - Tibet Plateau. However, further study isneeded to verify the existence of westward movement of the Yangtze plate and that of the conti-nental subduction. |
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| Keywords: | continental subduction the Qinghai - Tibet Plateau uplifting exhumation inver-sion |
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