RUI: Collaborative Research: Quantifying the roles of tectonic activity and climate as drivers of glacial-interglacial landscape evolution in the Teton Range, Wyoming

RUI：合作研究：量化构造活动和气候作为怀俄明州提顿山脉冰川-间冰期景观演化驱动因素的作用

• 批准号: 1755067
• 负责人: Darren Larsen
• 金额: $ 21.65万
• 依托单位: Occidental College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-01-15 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1755067&HistoricalAwards=false
• 关键词: RUI; Collaborative; Research; Quantifying; roles

The interplay of tectonics and climate is an essential aspect of mountain landscape evolution. Research efforts focusing on the interactions of mountain landscapes with climate and tectonism, especially those directed toward quantitative reconstructions of climatically and tectonically driven disturbances, are fundamental to understanding the past and future evolution of Earth's surface, and are critical for human adaptation and resource conservation efforts. This project focuses on the Teton mountain range in Grand Teton National Park, WY, where past climatic and tectonic disturbances are unusually well-recorded by glacial landforms, fault scarps, and lake sediment archives, all of which can be precisely dated. The overarching goals of this project are to quantify the influences of tectonic-driven disturbances (earthquakes, landslides) and climate-driven changes and disturbances (e.g. deglaciation, glacier fluctuations, vegetative shifts, fire occurrence) on alpine erosion rates and landscape evolution operating during the late Pleistocene and Holocene (past 25 ka). Specifically, the study combines detailed landform mapping, 10Be surface exposure dating, paleoseismic fault trenching, lake seismic surveys, and lake sediment cores to develop complementary records of: i) glacier fluctuations, including the timing and character of deglaciation and Neoglaciation; ii) environmental variability along the elevation gradient of the Teton range; and iii) earthquake timing and frequency related to postglacial ruptures of the Teton fault. The highly-active tectonic setting, distinctive geomorphology, and relatively pristine ecosystem of the Tetons present an exceptional opportunity for this research. Moreover, the integration of these techniques will provide comprehensive insights into the couplings and feedbacks among climatic and tectonic processes that modify all mountain landscapes over diverse length and time scales.

构造和气候的相互作用是山地景观演化的一个重要方面。专注于山地景观与气候和构造相互作用的研究工作，特别是那些针对气候和构造驱动的扰动的定量重建的研究工作，对于了解地球表面过去和未来的演化至关重要，并且对于人类适应和资源保护工作至关重要。该项目重点关注怀俄明州大提顿国家公园的提顿山脉，那里的冰川地貌、断层陡坡和湖泊沉积物档案异常详细地记录了过去的气候和构造扰动，所有这些都可以精确测定年代。该项目的总体目标是量化构造驱动的扰动（地震、山体滑坡）和气候驱动的变化和扰动（例如冰川消融、冰川波动、植被变化、火灾发生）对高山侵蚀率和景观演化的影响。晚更新世和全新世（过去25ka）。具体来说，该研究结合了详细的地形测绘、10Be表面暴露测年、古地震断层挖掘、湖泊地震调查和湖泊沉积岩芯，以开发以下方面的补充记录：i）冰川波动，包括​​冰川消融和新冰川作用的时间和特征； ii) 沿提顿山脉海拔梯度的环境变化； iii) 与提顿断层冰后破裂相关的地震时间和频率。大提顿山脉高度活跃的构造环境、独特的地貌和相对原始的生态系统为这项研究提供了绝佳的机会。此外，这些技术的整合将为气候和构造过程之间的耦合和反馈提供全面的见解，这些过程在不同的长度和时间尺度上改变了所有山地景观。