Collaborative Research: Equatorial Glaciation and Landscape Burial in the Late Paleozoic: Implications for Pangaean Climate and Tectonics

合作研究：晚古生代赤道冰川作用和景观埋藏：对盘古大陆气候和构造的影响

• 批准号: 1849623
• 负责人: Gerilyn Soreghan
• 金额: $ 44.9万
• 依托单位: University of Oklahoma Norman Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1849623&HistoricalAwards=false
• 关键词: Collaborative; Research; Equatorial; Glaciation; Landscape

Climate has varied widely through Earth history. Just as study of human history helps humankind better understand our future, study of Earth's climate history aids in better understanding current and future climate systems. This study is examining whether glaciers existed near Earth's equator at low elevations some 300 million years ago. First, seismic instruments are used to see below the ground surface of Unaweep Canyon (Colorado); this canyon was located near the equator 300 million years ago and now contains features that suggest ancient glaciers may have existed during that time. Peering below the ground surface allows researchers to see the canyon shape and features, including the amount of sediment fill. Next, researchers drill out core samples from the sediment. Detailed analyses of this sediment can reveal the age of the canyon, the past climate of the region, including whether glaciers existed, and how the present-day landscape formed. If it is determined that glaciers existed in this region millions of years ago, understanding of the climate system during that time would need major revision. Computer climate models then help researchers understand characteristics of winds, ocean temperatures, volcanic eruptions, and plant cover needed to produce the climate signal revealed in the core samples. This project includes education for high-school students from the Southern Ute Indian tribe, career training and preparation for university students, and collaboration with art students to create displays and presentations about the research results.This work tests the hypothesis that low-elevation uplands of equatorial Pangaea hosted glaciers during the Late Paleozoic. To test this, geophysics, thermochronology, and coring are used to determine the depth and nature of sediment fill and 3D basement shape of Unaweep Canyon (Colorado), a globally unique landform hypothesized to archive a paleolandscape modified by Permo-Pennsylvanian equatorial glaciation. Evidence for low-latitude glaciation would radically change understanding of the late Paleozoic icehouse, a critical interval for evolution of land animals and plants, and spur research on influences of alternative boundary conditions, climate forcings, and model configurations. Documenting an upland glacial landscape preserved for 300 (or possibly 600) My would also significantly challenge understanding of landscape genesis, evolution, and burial, and feedbacks between tectonics and climate. This research involves outreach to secondary-school students from the Southern Ute Indian tribe, training of STEM undergraduate and graduate students, and interfacing with art students to create impactful public outreach.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.

在地球历史上，气候变化很大。正如对人类历史的研究有助于人类更好地了解我们的未来一样，对地球气候历史的研究有助于更好地理解当前和未来的气候系统。这项研究正在研究大约3亿年前，地球赤道附近是否存在冰川。首先，地震仪器用于在Unaweep Canyon（科罗拉多州）的地面下方看；该峡谷位于3亿年前的赤道附近，现在包含表明在那段时间可能存在古老冰川的特征。在地面下方的凝视使研究人员可以看到峡谷形状和特征，包括沉积物填充量。接下来，研究人员从沉积物中钻出核心样品。对这种沉积物的详细分析可以揭示峡谷的年龄，该地区的过去气候，包括是否存在冰川以及当今的景观形成。如果确定在数百万年前的该地区存在冰川，那么在此期间对气候系统的理解将需要进行重大修订。然后，计算机气候模型可以帮助研究人员了解风，海洋温度，火山喷发以及产生核心样品中揭示的气候信号所需的植物覆盖的特征。该项目包括针对来自南部UTE印度部落的高中生的教育，为大学生的职业培训和准备工作，以及与艺术学生合作，以创建有关研究结果的展示和演讲。这项工作测试了以下假设：在晚古生代期间，赤道赤道Pangea托管的赤道低地居民托管了冰川。为了测试这一点，使用地球物理，热力学学和芯来确定沉积物填充的深度和性质和Unaweep Canyon（Colorado）的3D地下室形状，这是一种全球独特的地面，该地假设是由Permo-Pennsylvanian permo-pennsylvanian的遗产构造的旧景观。低纬度冰川的证据将从根本上改变对晚期冰屋的理解，这是陆地动物和植物进化的关键间隔，并刺激了对替代边界条件，气候强迫和模型构型影响的研究。记录保存300（或600可能）的高地冰川景观，我还将大大挑战对景观的创世纪，进化和埋葬以及构造和气候之间的反馈。这项研究涉及向来自南部Ute印度部落的二级学生进行宣传，对STEM本科和研究生的培训，并与艺术专业的学生进行交流，以创建有影响力的公共外展。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影响的评估来通过评估来支持的，这是值得的。

项目成果

Imaging an Enigmatic Paleovalley with Passive Seismic Methods (Unaweep Canyon, Colorado, United States)

使用被动地震方法对神秘的古山谷进行成像（美国科罗拉多州乌纳威普峡谷）

• DOI: 10.1785/0320220048
• 发表时间: 2023
• 期刊: The Seismic Record
• 作者: Dangwal, Deepankar;Behm, Michael;Chen, Xiaowei;Soreghan, Gerilyn S.
• 通讯作者: Soreghan, Gerilyn S.

Seismic Reflection and Electrical Resistivity Imaging Support Pre‐Quaternary Glaciation in the Rocky Mountains (Unaweep Canyon, Colorado)

地震反射和电阻率成像支持落基山脉第四纪冰川作用之前（科罗拉多州乌纳威普峡谷）

• DOI: 10.1029/2021gl094706
• 发表时间: 2021
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Patterson, Anna;Behm, Michael;Chwatal, Werner;Flores‐Orozco, Adrian;Wang, Yichuan;Soreghan, Gerilyn S.
• 通讯作者: Soreghan, Gerilyn S.

Hydrologic characterization of an alpine valley infill through integration of ERT, active seismic and active/passive surface wave interferometry (Unaweep Canyon, US)

通过集成 ERT、主动地震和主动/被动表面波干涉测量法对高山山谷填充物进行水文表征（Unaweep Canyon，美国）

• DOI: 10.5194/egusphere-egu2020-6199
• 发表时间: 2020
• 期刊: EGU General Assembly
• 作者: Behm, M.