The Nyainqentanghla Shan: Testing Models of Tibetan Crustal Evolution in an Oblique Crustal Section

念青唐古拉山：斜地壳剖面检验青藏高原地壳演化模型

• 批准号: 9909551
• 负责人: Timothy Harrison
• 金额: $ 19.28万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-01-15 至 2003-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909551&HistoricalAwards=false
• 关键词: Nyainqentanghla; Shan; Testing; Models; Tibetan

9909551HarrisonQuantitative tectonic models seeking to explain the evolution of the Indo-Asian collision zone make testable predictions regarding the thermal and physical state of the interior Himalayan and Tibetan crust. However it is difficult to obtain suitable samples to test these models because most of Tibet has experienced little Tertiary denudation, thus limiting the level of exposure to shallow depths. This project is aimed at obtaining the required samples to test the models by using exposures of middle crustal rocks brought to the surface by a large north - south trending graben. Results should provide the pattern of unroofing and other mechanisms of graben formation as well as allowing assessment of several models of mid-crustal development during the Neogene.

9909551哈里森试图解释印度支那-亚洲碰撞带演化的定量构造模型，对喜马拉雅和青藏地壳内部的热和物理状态做出了可检验的预测。然而，很难获得合适的样品来检验这些模型，因为西藏大部分地区经历了很少的第三纪剥蚀，从而限制了暴露在浅层深处的水平。该项目的目的是通过利用由南北走向的大型地块带到地表的中地壳岩石的暴露来获得检验模型所需的样品。结果应提供剥离模式和地块形成的其他机制，并使评估在新近纪期间中地壳发育的几种模式。