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变的一个重要方面。研究工作的重点是山区景观与气候和构造的相互作用，特别是那些针对定量重建气候和构造驱动的干扰，是了解地球表面的过去和未来的演变，是至关重要的人类适应和资源保护的努力。该项目的重点是提顿山脉在大提顿国家公园，怀俄明州，过去的气候和构造干扰异常良好的记录冰川地貌，断层陡坎，湖泊沉积物档案，所有这些都可以精确地定年。该项目的总体目标是量化晚更新世和全新世（过去25 ka）期间构造驱动的扰动（地震，山体滑坡）和气候驱动的变化和扰动（如冰川消退，冰川波动，植被转移，火灾发生）对高山侵蚀速率和景观演变的影响。具体而言，该研究结合了详细的地形测绘、10 Be地表暴露测年、古地震断层槽探、湖泊地震调查和湖泊沉积物岩心，以开发以下补充记录：i）冰川波动，包括冰消和新冰川作用的时间和特征; ii）提顿山脉沿着海拔梯度的环境变化;地震发生的时间和频率与冰后期提顿断层的断裂有关。提顿山脉的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一个难得的机会。此外，这些技术的整合将提供全面的洞察力的耦合和反馈之间的气候和构造过程，改变所有山区景观在不同的长度和时间尺度。