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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

基本信息

批准号：
1849754
负责人：
Nicholas Heavens
金额：
$ 15.66万
依托单位：
SPACE SCIENCE INSTITUTE
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 2023-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1849754&HistoricalAwards=false
关键词：
Collaborative Research Equatorial Glaciation Landscape

项目摘要

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。正如研究人类历史有助于人类更好地了解我们的未来一样，研究地球气候历史有助于更好地了解当前和未来的气候系统。这项研究正在调查大约3亿年前地球赤道附近的低海拔地区是否存在冰川。首先，使用地震仪器观察科罗拉多Unaweep峡谷的地表以下；这个峡谷位于3亿年前的赤道附近，现在包含的特征表明，在那个时期可能存在古代冰川。通过观察地表以下，研究人员可以看到峡谷的形状和特征，包括沉积物的填充量。接下来，研究人员从沉积物中钻出岩心样本。对这些沉积物的详细分析可以揭示峡谷的年龄，该地区过去的气候，包括冰川是否存在，以及今天的景观是如何形成的。如果确定数百万年前该地区存在冰川，那么对当时气候系统的理解将需要进行重大修订。然后，计算机气候模型帮助研究人员了解风、海洋温度、火山爆发和植物覆盖的特征，这些特征是产生核心样本中显示的气候信号所必需的。该项目包括对来自南乌特印第安部落的高中生的教育，对大学生的职业培训和准备，以及与艺术学生合作，为研究成果进行展示和展示。这项工作验证了赤道泛大陆的低海拔高地在晚古生代拥有冰川的假设。为了验证这一点，我们使用了地球物理学、热年代学和岩心来确定unawweep Canyon （Colorado）的沉积物填埋深度和性质，以及三维基底形状。unawweep Canyon （Colorado）是一种全球独特的地貌，被假设为保存了受二叠纪-宾夕法尼亚赤道冰川作用影响的古地貌。低纬度冰川作用的证据将从根本上改变对晚古生代冰窖的理解，这是陆地动植物进化的一个关键时期，并促进对替代边界条件、气候强迫和模式配置影响的研究。记录保存了300年（或可能600年）的高地冰川景观也将极大地挑战对景观成因、演化和埋藏以及构造和气候之间反馈的理解。这项研究包括向来自南乌特印第安部落的中学生进行外展，培训STEM本科生和研究生，并与艺术学生进行接触，以创造有影响力的公共外展。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。