| 中国大陆印支碰撞造山系及其造山机制 |
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| 引用本文： | 许志琴,杨经绥,李化启,王瑞瑞,蔡志慧.中国大陆印支碰撞造山系及其造山机制[J].岩石学报,2012,28(6):1697-1709. |
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| 作者姓名： | 许志琴 杨经绥 李化启 王瑞瑞 蔡志慧 |
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| 作者单位： | 大陆构造与动力学国家重点实验室,中国地质科学院地质研究所,北京100037 |
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| 基金项目： | 本文受国家自然科学基金委创新群体项目(40921001) 和中国地质调查局项目(1212010818094) 联合资助. |
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| 摘 要： | 古特提斯洋盆的闭合导致了诸多的微块体于晚三叠世至中侏罗世(T3-J2)碰撞,形成东亚大陆南部巨型印支造山系。中国大陆的印支碰撞造山系呈现巨大的"T"型复合造山系,位于西部的印支造山系(巴颜喀拉-北羌塘-南羌塘-拉萨印支造山带)形成于"多洋盆、多地体、多岛弧"的古特提斯的构造背景,伴随古特提斯多洋盆的俯冲和闭合,产生广泛的岛弧、增生楔和高压变质带的增生造山,以及多地体的碰撞造山作用,形成大型造山拼贴体,伴随以紧闭同劈理褶皱和逆冲、走滑断裂为特征的地壳变形。而位于中东部的印支造山系为北中国与扬子陆块之间的直接碰撞的产物,在扬子被动陆缘之上形成的松潘-甘孜、南秦岭造山带显示深层滑脱为造山机制的大规模地壳上部剪切应变;由于扬子地壳印支期深俯冲(>100km)和山根挤出机制,造成大别-苏鲁造山带中大规模高压-超高压变质带的出露。
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| 关 键 词： | 印支 碰撞造山系 机制 |
| 收稿时间： | 3/1/2012 12:00:00 AM |
| 修稿时间： | 5/7/2012 12:00:00 AM |
Indosinian collision-orogenic system of Chinese continent and its orogenic mechanism |
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| XU ZhiQin,YANG JingSui,LI HuaQi,WANG RuiRui and CAI ZhiHui.Indosinian collision-orogenic system of Chinese continent and its orogenic mechanism[J].Acta Petrologica Sinica,2012,28(6):1697-1709. |
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| Authors: | XU ZhiQin YANG JingSui LI HuaQi WANG RuiRui and CAI ZhiHui |
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| Institution: | State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | The closure of the large Paleo-Tethyan Ocean at the T3-J2 period induced collisions of many microterrains and formed huge Paleo-Tethys orogenic belts in South Asia, also known as Indosinian orogenic belts. The Indosinian orogenic belts of the Chinese continent and adjacent areas shows a "T"-shaped composite orogeny. Studies have shown that the western Indosinian "Bayan Har-North Qiangtang-South Qiangtang-Lasha" orogenic belts were formed in the Paleo-Tethys setting of multi-ocean basins, multi-terrains and multi-island arcs". Subduction and closure of Paleo-Tethyan ocean basins yielded a wide accretional orogeny in island arcs, accretionary wedges and high-pressure metamorphic belts, as well as large-scale orogenic collage due to multi-terrains collision orogeny charecterized by crustal deformations of syn-cleavage folds, thrusts and strike-slip faults. The eastern Indosinian orogenic system is the direct collision result between the North China and Yangtze blocks. The Songpan-Ganzi and South Qinling orogenic belts located above the Yangtze passive margin show large-scale deep decollement orogenic mechanism between the Upper Proterozoic metamorphic basement and Paleozoic-Triassic covers, as well as intensive shear strain of the Yangtze upper crust. The deep subduction (>100km) of the Yangtze crust and root extrusion mechanism yielded large-scale high pressure/ultra-high pressure metamorphic belts exposed in the Dabie-Sulu orogenic belt. |
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| Keywords: | Indosinian Collision-orogenic system Mechanism |
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