Collaborative Research: Geomorphic-Geodynamicc Coupling at the Orogen Scale: A Himalayan Transect in Central Nepal

合作研究：造山带尺度的地貌-地球动力学耦合：尼泊尔中部喜马拉雅断面

• 批准号: 9909488
• 负责人: Ann Blythe
• 金额: $ 10.63万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-12-01 至 2003-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909488&HistoricalAwards=false
• 关键词: Collaborative; Research; Geomorphic; Geodynamicc; Coupling

9909488BlytheOne of the most provocative - yet largely untested - recent hypotheses concerning orogenic evolution is that regional variations in climate strongly influence spatial variations in the style and magnitude of deformation across an actively deforming orogen. Recent progress in quantifying rates of both tectonic and geomorphic processes and in modeling surface and lithospheric processes sets the stage for an integrated, quantitative, field-and model- based investigation of the interactions and feedbacks between geomorphic, climatic, and tectonic processes. This project involves an examination of these interactions where they are likely to be most clearly expressed: the Nepalese Himalaya. Not only is this the quintessential colloisional orogenic belt, but its topographic growth and erosional history have been suggested as key controls on global climatic changes. The integrated study focuses on a major transverse catchment, stretching from the edge of the Tibetan Plateau to the foreland and traversing some of the highest topography in the world. This transect spans the major structural elements of the Himalaya, as well as monsoon-to-rainshadow climatic conditions. The Principal Investigators bring together expertise in process-based geomorphology, glaciology, climatology, structural geology, thermochronology, cosmogenic radionuclide dating, modeling, and documentary film making for a multi-pronged approach intended to evaluate one overarching, but largely untested hypothesis: Rates of erosion vary spatially as a function of climate and this spatial variability in erosion controls the partitioning of deformation within an orogen.***

9909488Blythe 最近关于造山带演化的最具争议性但基本上未经检验的假设之一是，气候的区域变化强烈影响活跃变形的造山带的变形类型和幅度的空间变化。 最近在量化构造和地貌过程速率以及模拟地表和岩石圈过程方面取得的进展为对地貌、气候和构造过程之间的相互作用和反馈进行综合、定量、基于现场和模型的研究奠定了基础。 该项目涉及对这些相互作用可能最清楚表达的地方进行检查：尼泊尔喜马拉雅山。 这不仅是典型的碰撞造山带，而且其地形生长和侵蚀历史也被认为是全球气候变化的关键控制因素。 这项综合研究的重点是一个主要的横向流域，从青藏高原边缘延伸到前陆，穿越世界上一些最高的地形。 这条横断面跨越了喜马拉雅山的主要结构要素，以及季风到雨影的气候条件。 主要研究人员汇集了基于过程的地貌学、冰川学、气候学、结构地质学、热年代学、宇宙成因放射性核素测年、建模和纪录片制作方面的专业知识，采用多管齐下的方法，旨在评估一个总体但基本上未经检验的假设：侵蚀率随气候而在空间上变化，而侵蚀的空间变异性控制着侵蚀率。 造山带内变形的划分。***