Collaborative Research: Moving mountains: timing and emplacement of the Marysvale gravity slide complex

合作研究：移动山脉：马里斯维尔重力滑梯综合体的时间和位置

• 批准号: 2113155
• 负责人: WIlliam Griffith
• 金额: $ 22.97万
• 依托单位: Ohio State University
• 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: 2021-07-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2113155&HistoricalAwards=false
• 关键词: Collaborative; Research; Moving; mountains; timing

Volcanic fields are dynamic environments, characterized by rapidly evolving landscapes and extreme hazard potential. This research project is focused on learning and understanding the processes involved in collapse of volcanic fields and production of mega-scale landslides. The project objectives will be achieved by geologic mapping of the ancient Marysvale gravity slide complex in southwestern Utah, one of the largest such structures in the world that is made up of three individual mega-scale slides, determining the age of rocks contained in the slides, and modeling slide initiation and lateral transport to distances over 35 km to the south of their initiation sites. This research project assembles a new multi-institution, multi-disciplinary collaboration and will provide support for graduate and undergraduate students. High-resolution 3D geologic data collected during this study will be used to develop virtual field trips and field camp mapping modules. These modules will be interactive and contain outcrop models, geologic maps, and samples that will enable students and the public to learn more about volcanic hazards and mega-scale landslides. The modules will also serve a broader mission to make the Earth Sciences accessible to a broad, diverse population. During the late Oligocene to Miocene, the Marysvale volcanic field of southwestern Utah, USA, experienced three consecutive mega-scale catastrophic collapse events, collectively called the Marysvale gravity slide complex (MGSC). The stratigraphic succession, kinematic indicators, basal structures, pervasive fragmentation, and pseudotachylyte collectively suggest that emplacement of each of these slides occurred at high velocity during individual events. Outstanding questions for these landslides include (1) the conditions of the volcanic field that made it susceptible to mega-scale collapse, and (2) the factors which allowed the resulting gigantic slides to travel tens of kilometers at high velocity, driven by gravity. The MGSC provides an excellent opportunity to address these questions due to the exceptional exposure of the internal structure and basal slide planes of the slide blocks. Through a multidisciplinary approach combining geologic mapping, geochronology, rock mechanics analyses, and numerical modeling, we will evaluate the timing of slide initiation with respect to evolution of the volcanic field and major eruptive events, the role of a frictionally weak substrate on slide initiation, and the combined roles of thermal pressurization, damage, and shear localization on slide mobility and deceleration. Geological mapping and field work, combined with 40Ar/39Ar and zircon U-Pb geochronology, will provide constraints on timing, the dimensions and continuity of each slide, and the structure of the basal sliding surface. Laboratory measurements of rock properties, combined with field-based geologic parameters, will be used to constrain numerical models of both the coupled processes facilitating slide mobility and the conditions of pre-slide stability, representing an unprecedented level of geologic constraint on models of massive-scale, long runout landslides.This project is jointly funded by the Tectonics program and the Petrology & Geochemistry program in the division of Earth Sciences.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.

火山场是动态环境，其特征是迅速发展的景观和极端危害潜力。该研究项目的重点是学习和理解火山场崩溃的过程以及大规模滑坡的生产。该项目目标将通过在犹他州西南部的古代Marysvale Gravity Slide Complex的地质映射来实现，这是世界上最大的此类结构之一，由三个单独的大型幻灯片组成，确定了幻灯片中包含的岩石时代，并建模滑动启动和横向运输到其启动部位以上35公里以上的距离。该研究项目组建了新的多机构，多学科的合作，并将为研究生和本科生提供支持。在这项研究中收集的高分辨率3D地质数据将用于开发虚拟野外旅行和野外训练营地图模块。这些模块将具有互动性，并包含露头模型，地质图和样本，这些模型将使学生和公众能够更多地了解火山危害和大型滑坡。这些模块还将执行更广泛的使命，使地球科学可容纳广泛，多样化的人群。在渐新世晚期至中新世期间，美国犹他州西南部的Marysvale火山场经历了连续三场大型灾难性崩溃事件，共同称为Marysvale Gravity Slide Slide Complect（MGSC）。地层依次，运动学指标，基础结构，普遍的碎片化和假胆红素统称，这些幻灯片中的每一个都发生在单个事件中的高速下发生。这些滑坡的出色问题包括（1）使其容易受到大规模崩溃的火山场的状况，以及（2）允许由此产生的巨大幻灯片以高速行驶的数以数十公里的因素，受到重力的驱动。 MGSC为解决这些问题提供了一个绝佳的机会，因为内部结构和幻灯片块的基础滑梯的特殊曝光。通过多学科方法，结合地质图，地质学，岩石力学分析和数值建模，我们将评估幻灯片启动的时间与火山场的演变和重大喷发事件的演变，这是摩擦弱的底物在幻灯片启动中的作用，以及热加压，损伤和剪切定位在滑动迁移率和减速上的综合作用。地质映射和现场工作，结合40AR/39AR和锆石U-PB地质学，将对时序，每个幻灯片的尺寸和连续性以及基础滑动表面的结构提供约束。实验室测量岩石性能，结合了基于现场的地质参数，将用于约束促进滑动迁移率的耦合过程的数值模型和前坡度稳定性的条件，这代表了前所未有的地质约束水平规模，长径流滑坡。该项目由构造计划和地球科学系中的质学与地球化学计划共同资助。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子和更广泛的评估来支持的。影响审查标准。

项目成果

The concept of tectonic provenance: Case study of the gigantic Markagunt gravity slide basal layer

构造物源概念：以巨型Markagunt重力滑坡基底层为例

• DOI: 10.1111/ter.12608
• 发表时间: 2022
• 期刊: Terra Nova
• 影响因子: 2.4
• 作者: Mayback, Danika F.;Braunagel, Michael J.;Malone, David H.;Griffith, W. Ashley;Holliday, McKenna E.;Rivera, Tiffany A.;Biek, Robert F.;Hacker, David B.;Rowley, Peter D.
• 通讯作者: Rowley, Peter D.

Structural Relationships Across the Sevier Gravity Slide of Southwest Utah and Implications for Catastrophic Translation and Emplacement Processes of Long Runout Landslides

犹他州西南部塞维尔重力滑坡的结构关系及其对长滑坡灾难性平移和就位过程的影响

• DOI: 10.1029/2022gc010783
• 发表时间: 2023
• 期刊: Geosystems
• 作者: Braunagel, Michael J.;Griffith, W. Ashley;Biek, Robert F.;Hacker, David B.;Rowley, Peter D.;Malone, David H.;Mayback, Danika;Rivera, Tiffany A.;Loffer, Zachary;Smith, Zachary D.
• 通讯作者: Smith, Zachary D.