Collaborative Research: Evaluating the evolution of the southern Himalayan-Tibetan orogeny: What happened during Paleocene-Eocene time?

合作研究：评估南喜马拉雅-西藏造山运动的演化：古新世-始新世期间发生了什么？

• 批准号: 2020457
• 负责人: Kathryn Metcalf
• 金额: $ 29.37万
• 依托单位: CSU Fullerton Auxiliary Services Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-01-01 至 2024-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2020457&HistoricalAwards=false
• 关键词: Collaborative; Research; Evaluating; evolution; southern

The ongoing tectonic collision between India and Asia began about 59 million years ago, creating the highest mountains on Earth. While the tectonic history of the last 28 million years is well documented in the Himalayan Mountains, the earlier phase of the collision remains poorly understood. During this earlier phase of collision sedimentary rocks were intensely folded and buckled in the region north of Nepal in southern Tibet. This project will use new field and laboratory analytical techniques to determine how the rocks in this region were deformed during the early phase of the collision. Results from this work will help discriminate between models for the India - Asia collision and evaluate whether the southern Tibet region contains ~2,000 km of shortening. In addition, this project will: 1. enhance multi-disciplinary training of graduate and undergraduate students from historically underrepresented groups; 2. strengthen international scientific collaborations; and 3. develop new, and augment existing, science-focused outreach opportunities for K-12 students from historically underrepresented groups.This project focuses on the Tethyan fold-thrust belt on the southern margin of the Himalayan-Tibetan orogen in order to determine the style, magnitude, and timing of shortening. Little is known about the evolution of the fold-thrust belt from collision at ~59 million years ago until the oldest dated Himalayan thrust at ~28 million years ago. A complete study from the Indus-Yarlung suture zone in the north to the South Tibetan detachment system in the south will establish a minimum shortening estimate that incorporates all scales of deformation, and determine what happened during Paleocene-Eocene time (60 to 30 million years ago). Research will focus on four transects that combine structural field studies with laboratory analyses of apatite fission track, (U-Th)/He in zircon, and U-Pb detrital zircon geochronology. These data will inform new balanced cross sections and four thermokinematic models. Results will be used in new models for the evolution of the Tethyan fold-thrust belt, which will be combined with existing cross sections in Nepal and Bhutan to provide a lithospheric evolution of the entire system.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

大约5900万年前，印度和亚洲之间正在进行的构造碰撞开始，创造了地球上最高的山脉。虽然在喜马拉雅山脉中，过去2800万年的构造历史已得到充分记录，但碰撞的早期阶段仍然很少了解。在碰撞沉积岩的早期阶段，在西藏南部的尼泊尔以北的地区，密切折叠并弯曲。该项目将使用新的领域和实验室分析技术来确定在碰撞的早期阶段如何变形该区域的岩石。这项工作的结果将有助于区分印度 - 亚洲碰撞的模型，并评估西藏南部地区是否包含约2,000公里的缩短。此外，该项目还将：1。对历史上代表性不足的群体的研究生和本科生的多学科培训进行增强； 2。加强国际科学合作；和3。为来自历史上代表性不足的组的K-12学生开发新的，增强的，以科学为中心的外展机会。该项目重点介绍喜马拉雅 - 藏基因造型南部边缘的Tethyan折叠式式腰带，以确定近短期的风格，大小和时机。关于5,900万年前的碰撞碰撞带来的折叠式腰带的演变知之甚少，直到约会最大的喜马拉雅人在约2800万年前推动。一项从北部的印度裔亚隆缝合区到南部藏族脱离系统的完整研究将建立最低缩短估算，并结合所有变形范围，并确定在古新世 - 新世时代（60到3000万年前）中发生的情况。研究将侧重于四个横断面，这些样本将结构现场研究与磷灰石裂变轨道，（u-th）/HE的实验室分析和U-PB碎屑锆石的地球人工学分析。这些数据将为新的平衡横截面和四个热电学模型提供信息。结果将用于新的模型中，以用于Tethyan折叠式腰带的发展，该腰带将与尼泊尔和不丹的现有横截面相结合，以提供整个系统的岩石圈演化。该奖项反映了NSF的法定任务，并通过使用该基金会的知识优点和广泛影响来评估NSF的法定任务。