| 蛇绿岩就位机制及时限 |
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| 引用本文： | 马冲,赵桂萍,肖文交,韩春明,罗军,王忠梅.蛇绿岩就位机制及时限[J].地质科学,2011,0(3):865-874. |
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| 作者姓名： | 马冲 赵桂萍 肖文交 韩春明 罗军 王忠梅 |
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| 作者单位： | 1.中国科学院研究生院地球科学学院,中国科学院计算地球动力学重点实验室 北京100049；2.中国科学院地质与地球物理研究所岩石圈演化国家重点实验室 北京 100029；3.中国科学院新疆生态与地理研究所新疆矿产资源研究中心 新疆乌鲁木齐 830011 |
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| 基金项目： | 国家重点基础研究发展计划项目，国家自然科学基金 |
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| 摘 要： | 蛇绿岩就位机制可以划分出4种:1)碰撞仰冲型:被动大陆边缘或岛弧与洋壳碰撞时,俯冲到一定深度的硅铝质物质在浮力作用下折返,并上驮相对完整的大洋岩石圈残片到达地表；2)增生底垫型:洋底、海沟沉积物及海底较高地形的上层物质从俯冲板块上刮削下来,持续底垫到上覆板块之下,使大洋岩石圈残片逐渐被动抬高；3)俯冲剥离型:断裂发育相...
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| 关 键 词： | 蛇绿岩 蛇绿岩就位机制 蛇绿岩就位时限 |
| 收稿时间： | 2011-03-10 |
Emplacement of ophiolites:Mechanisms and timing |
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| Ma Chong,Zhao Guiping,Xiao Wenjiao,Han Chunming,Luo Jun,Wang Zhongmei.Emplacement of ophiolites:Mechanisms and timing[J].Chinese Journal of Geology,2011,0(3):865-874. |
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| Authors: | Ma Chong Zhao Guiping Xiao Wenjiao Han Chunming Luo Jun Wang Zhongmei |
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| Institution: | 1.Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences;College of Earth Science, Graduate University of the Chinese Academy of Sciences, Beijing 100049;2.Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029;3.Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011 |
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| Abstract: | Based on different processes and characters，four mechanisms of ophiolite emplacement are mainly discussed：Collision obduction type(obduction of forearc oceanic lithosphere onto a passive continental margin or arc during the attempted subduction of the passive margin or arc)； Accretion underplating type(continued growth of the underlying accretionary complex by underplating gradually uplifts the overlying oceanic lithosphere)； Subduction flake type(the upper part of the oceanic lithosphere be flaked from the mid ocean spreading centers or transform faults，the lowest strength areas of the oceanic plate，and then be uplifted during the subduction)； Corner flow type(dismembered oceanic lithosphere fragments are carried in the narrow/wide accretionary prism through a channel flow，after subjected the high pressure metamorphism，they finally be carried out by the lower density materials).The age of the metamorphic soles can constrain the beginning of ophiolite emplacement and，the formation of the post emplacement sediments record the minimum age of emplacement of the ophiolite over the continent or arc. |
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| Keywords: | Ophiolite Ophiolite emplacement mechanisms Ophiolite emplacement timing |
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