A view from the roof the Earth on processes in its deep crust: the India-Asia suture zone, southwestern Tibet

从地球顶部看地壳深处的过程：西藏西南部的印度-亚洲缝合带

• 批准号: 195342372
• 负责人: Dr. Matthijs Smit
• 金额: --
• 依托单位: Department of Earth Science
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/195342372?language=en
• 关键词: view; roof; Earth; processes; its

The collision of continental fragments following the subduction of intervening oceanic lithosphere results in a drastic change in the dynamics of plates, produces Earth’s most extensive mountain belts, determines the global distribution of sediment production, and influences the global climate dynamics by closing oceanic basins and raising topography. Although this represents a fundamental process in the dynamics of Earth and the shaping of its continents and oceans, our knowledge of the driving geodynamic mechanisms, in particular those that operate in the deep crust, are limited. To gain a better understanding of these mechanisms, this project focuses on the India-Asia Collision Zone (IASZ) of southwestern Tibet; an archetypal, yet understudied suture zone, which is still undergoing uplift and subduction. High-grade metamorphic rocks from the axial zone of this geological megastructure will be subjected to multidisciplinary research that integrates macro- and micro-tectonic, petrological, and geochronological (Lu-Hf, Sm-Nd, U-Pb, Ar-Ar) data. The study will clarify the boundary conditions of different styles of metamorphism in such settings and will make predictions from typical geological features of this suture zone about the anatomy and evolution of such mega-structures.

大洋岩石圈俯冲后大陆板块的碰撞导致板块动力学的剧烈变化，形成地球上最大的山脉带，决定了沉积物的全球分布，并通过关闭洋盆和抬升地形影响全球气候动力学。虽然这是地球动力学及其大陆和海洋形成的一个基本过程，但我们对驱动地球动力学机制，特别是在地壳深部运作的机制的了解有限。为了更好地了解这些机制，本项目重点关注西藏西南部的印度-亚洲碰撞带（IASZ）;这是一个原型，但研究不足的缝合带，仍在经历隆起和俯冲。从这个地质巨型结构的轴带的高级变质岩将进行多学科的研究，整合宏观和微观构造，岩石学和地质年代学（Lu-Hf，Sm-Nd，U-Pb，Ar-Ar）数据。该研究将阐明在这种环境中不同类型变质作用的边界条件，并将从该缝合带的典型地质特征中预测这种巨型构造的解剖和演化。