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The Influence of Surface Processes on Continental Deformation: Extension and Erosion in the Basin and Range

地表过程对大陆变形的影响：盆地和山脉的伸展和侵蚀

基本信息

批准号：
2390201
负责人：
金额：
--
依托单位：
Birkbeck, University of London
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2020
资助国家：
英国
起止时间：
2020 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2390201
关键词：
Influence Surface Processes Continental Deformation

项目摘要

During continental deformation, strain is rarely evenly distributed across large regions, or equally partitioned onto discrete structures such as faults. Instead, some areas may host large amounts of strain, deformation and uplift, whilst others are left relatively undeformed. The reasons for this remain poorly understood. The drivers of partitioning of strain can range from rheological differences in the crust, to climate factors that influence erosion. During crustal extension, movement of surficial loads by surface processes can heavily influence the longevity of faults. It is thus possible that surface processes may play a vital role in partitioning strain in extensional domains. The Basin and Range provides an ideal area to study the influence of surface processes on tectonic development, as the region has been subject to ongoing extension since the Miocene and accommodates gradients in climate and different surface processes. This project will combine thermochronology analyses with numerical modelling of physical processes to characterise the strain rate history of the Basin and Range, assessing the extent to which surface processes can be considered drivers of strain release and range tectonic development. The wider utility of this work is that it can help inform seismic risk assessments associated with predicted climate change.

在大陆变形过程中，应变很少均匀分布在大片区域，或者均匀分布在断层等离散结构上。相反，一些区域可能存在大量的应变、变形和隆起，而其他区域则相对未变形。其原因仍然知之甚少。应变分配的驱动因素包括地壳流变差异和影响侵蚀的气候因素。在地壳伸展过程中，地表过程引起的地表载荷运动会严重影响断层的寿命。因此，表面过程可能在拉伸域中的应变分配中发挥至关重要的作用。盆地和山脉为研究地表过程对构造发展的影响提供了一个理想的区域，因为该地区自中新世以来一直在持续扩张，并适应气候梯度和不同的地表过程。该项目将热年代学分析与物理过程的数值模拟相结合，以表征盆地和山脉的应变率历史，评估地表过程在多大程度上可以被视为应变释放和山脉构造发展的驱动因素。这项工作更广泛的用途是它可以帮助为与预测的气候变化相关的地震风险评估提供信息。