| 大洋俯冲和大陆碰撞沿走向的转换动力学及流体-熔体活动的作用 |
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| 引用本文： | 李忠海,许志琴.大洋俯冲和大陆碰撞沿走向的转换动力学及流体-熔体活动的作用[J].岩石学报,2015,31(12):3524-3530. |
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| 作者姓名： | 李忠海 许志琴 |
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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,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： | 本文受国家重点基础研究发展计划项目(2015CB856106)、国家自然科学基金项目(41304071)、中组部青年千人计划项目和中国地质科学院地质研究所黄汲清青年人才计划项目联合资助. |
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| 摘 要： | 为了深入探讨大洋俯冲和大陆碰撞沿走向的转换及其动力学特征,同时更好的理解俯冲-碰撞带的流体-熔体活动及其效应,我们建立了一系列三维空间的大尺度、高分辨率的动力学数值模型。模拟结果显示,在板块会聚过程中,流体-熔体活动可以降低周围岩石的流变强度及两个板块之间的耦合作用,并能够促进大陆碰撞带俯冲板块的断离。同时,俯冲-碰撞带的空间转换模型揭示其深部结构存在巨大的沿走向的差异性,大陆碰撞带发生俯冲板块断离,而大洋俯冲板块持续下插。并且上覆板块的地壳物质发生从陆-陆碰撞带向洋-陆俯冲带的侧向逃逸。这种三维空间中沿走向的差异性俯冲-碰撞模式与中-东特提斯构造带相吻合,并揭示其动力学机制。
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| 关 键 词： | 大洋俯冲 大陆碰撞 板块断离 流体活动 部分熔融 数值模拟 |
| 收稿时间： | 6/1/2015 12:00:00 AM |
| 修稿时间： | 9/5/2015 12:00:00 AM |
Dynamics of along-strike transition between oceanic subduction and continental collision: Effects of fluid-melt activity |
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| LI ZhongHai and XU ZhiQin.Dynamics of along-strike transition between oceanic subduction and continental collision: Effects of fluid-melt activity[J].Acta Petrologica Sinica,2015,31(12):3524-3530. |
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| Authors: | LI ZhongHai and XU ZhiQin |
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| Institution: | State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China and State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | In order to investigate the along-strike transition from oceanic subduction to continental collision, as well as better understand the fluid-melt activity and their effects on the subduction and collision dynamics, we have conducted a series of three-dimensional (3-D) large-scale numerical models. The model results demonstrate that fluid and melt activities can weaken the neighboring rocks as well as the coupling between subducting and overriding plates, which thereby propel the break-off of subducted slab. These subduction/collision transition models reveal large along-strike variations of the deep structures and geodynamic characteristics, e.g., continuous subduction in the oceanic subduction zones versus slab break-off in the continental collision zones. In addition, the crustal materials of the overriding plate will laterally escape from continent-continent collision zone to the ocean-continent subduction zone. The 3-D transverse deformation and along-strike variations are consistent with the middle-eastern Tethyan belt and further reveal its geodynamic mechanism. |
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| Keywords: | Oceanic subduction Continental collision Slab break-off Fluid activity Partial melting Numerical modeling |
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