Collaborative Proposal: Do arc-continent collisions in the tropics set the Earth's climate state?

合作提案：热带地区的弧大陆碰撞是否决定了地球的气候状态？

基本信息

批准号：
1925990
负责人：
Nicholas Swanson-Hysell
金额：
$ 74.49万
依托单位：
University of California-Berkeley
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：
2019-08-01 至 2024-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1925990&HistoricalAwards=false
关键词：
Collaborative Proposal Do arc continent

项目摘要

Over its history, Earth has experienced warm ice-free and cold glacial climates, but it is unknown if transitions between these background climate states were the result of changes in CO2 sources or sinks. On these multi-million year geological timescales, CO2 enters the ocean and atmosphere primarily by volcanic outgassing and is removed primarily though the chemical erosion of rocks, which delivers calcium and magnesium via rivers to the ocean where they react with CO2 to form carbonate. It is hypothesized that the tectonic closure of ocean basins and formation of mountains at equatorial latitudes could drive cooling by creating topography and eroding highly soluble oceanic rocks in the warm, wet tropics. This process increases global weatherability, thereby increasing Earth's potential to sequester CO2 in carbonates through chemical erosion. The investigators aim to test the hypothesis that changes in global weatherability have controlled the Earth's background climate state with coupled geological, geochemical, and modelling studies. This broader impact of this work will benefit society by generating and disseminating knowledge about geological climate change at both the K-12 and college level. The researchers have developed a global database of arc-continent collisions through the Phanerozoic, which mark the closure of former ocean basins, and reconstructed their position with state-of-the-art paleogeographic models. The results from this analysis revealed a temporal coincidence between the maximum global extent of arc-continent collision in the tropics and the occurrence of every major glacial period in the Phanerozoic. The investigators will refine geological constraints and tectonic reconstructions in five critical belts. Through these case studies, the researchers will generate thermochronological data and refine the exhumation history of New Guinea and construct a new paleogeographic model for suturing in the Alpine-Himalaya belt. The investigators will also acquire new stratigraphic, geochronological, geological, petrographic, geochemical, and paleomagnetic data along Permo-Carboniferous sutures from Mexico to South America, Ordovician sutures in the northern Appalachian, and Neoproterozoic sutures in the Arabian-Nubian Shield. These field and laboratory data will be integrated with paleogeographic, weathering, and climate models to develop estimates for the change in pCO2 resulting from arc-continent collisions in the tropics utilizing the GEOCLIM model framework. This framework integrates climate models run at varying pCO2 with global weathering models such that the variable climatology can be used to estimate the effect of changes in global weatherability model on long-term steady-state pCO2 levels. In this framework, the investigators will perform sensitivity tests to isolate the effects of specific parameters such as lithology or topography. The researchers will further calibrate these models with source-to-sink cation studies in modern and paleo ophiolite watersheds. Finally, they will develop statistical methods to evaluate the strength of correlation and test hypothesized causal mechanisms for environmental change. Through this research the investigators will directly train a postdoctoral researcher, 5 PhD students and numerous undergraduate research assistants. To disseminate this basic research, the team will hold public seminars and workshops with K-12 teachers, and construct classes on Tectonics and Climate with online course materials, both at the high-school and undergraduate level.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.

在其历史上，地球经历了温暖的无冰气候和寒冷的冰川气候，但尚不清楚这些背景气候状态之间的转变是否是二氧化碳源或汇变化的结果。在这些数百万年的地质时间尺度上，二氧化碳主要通过火山放气进入海洋和大气，并主要通过岩石的化学侵蚀去除，岩石通过河流将钙和镁输送到海洋，在那里它们与二氧化碳反应形成碳酸盐。据推测，海洋盆地的构造闭合和赤道纬度山脉的形成可能会通过在温暖潮湿的热带地区创造地形和侵蚀高度可溶的海洋岩石来推动气温变冷。这一过程提高了全球的耐候性，从而增加了地球通过化学侵蚀将二氧化碳封存在碳酸盐中的潜力。研究人员旨在通过地质、地球化学和建模研究来检验全球耐候性变化控制了地球背景气候状态的假设。这项工作的更广泛影响将通过在 K-12 和大学层面产生和传播有关地质气候变化的知识来造福社会。研究人员开发了一个关于显生宙期间弧大陆碰撞的全球数据库，显生宙标志着前海洋盆地的闭合，并利用最先进的古地理模型重建了它们的位置。这项分析的结果揭示了热带地区弧大陆碰撞的最大全球范围与显生宙每个主要冰川期的发生之间的时间重合。研究人员将完善五个关键带的地质约束和构造重建。通过这些案例研究，研究人员将生成热年代学数据，完善新几内亚的折返历史，并构建阿尔卑斯-喜马拉雅带缝合的新古地理模型。研究人员还将获取从墨西哥到南美的二叠纪-石炭系缝合线、阿巴拉契亚北部的奥陶系缝合线以及阿拉伯-努比亚地盾的新元古代缝合线沿线的新地层、年代学、地质、岩相、地球化学和古地磁数据。这些现场和实验室数据将与古地理、风化和气候模型相结合，利用 GEOCLIM 模型框架对热带地区弧大陆碰撞引起的 pCO2 变化进行估计。该框架将不同 pCO2 运行的气候模型与全球风化模型相结合，以便可变气候学可用于估计全球风化模型变化对长期稳态 pCO2 水平的影响。在此框架中，研究人员将进行敏感性测试，以隔离岩性或地形等特定参数的影响。研究人员将通过现代和古蛇绿岩流域的源-汇阳离子研究进一步校准这些模型。最后，他们将开发统计方法来评估相关性的强度并测试假设的环境变化因果机制。通过这项研究，研究者将直接培养一名博士后研究员、五名博士生和多名本科生研究助理。为了传播这项基础研究，该团队将与 K-12 教师一起举办公开研讨会和讲习班，并在高中和本科阶段使用在线课程材料构建构造和气候课程。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力优点和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

期刊论文数量（5）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Evaluating the Relationship Between the Area and Latitude of Large Igneous Provinces and Earth's Long-Term Climate State

评估大型火成岩省的面积和纬度与地球长期气候状态之间的关系

DOI：
10.31223/osf.io/p9ndf
发表时间：
2021-01
期刊：
Geophysical monograph
影响因子：
0
作者：
Park, Y.;Swanson;Macdonald, F.M.;Lisiecki, L.
通讯作者：
Lisiecki, L.

Mineralogical, magnetic and geochemical data constrain the pathways and extent of weathering of mineralized sedimentary rocks

矿物学、磁性和地球化学数据限制了矿化沉积岩风化的途径和程度

DOI：
10.1016/j.gca.2022.11.005
发表时间：
2023-02
期刊：
Geochimica et Cosmochimica Acta
影响因子：
5
作者：
Carrero, Sergio;Slotznick, Sarah P.;Fakra, Sirine C.;Sitar, M. Cole;Bone, Sharon E.;Mauk, Jeffrey L.;Manning, Andrew H.;Swanson;Williams, Kenneth H;Banfield, Jillian F.;et al
通讯作者：
et al

Limited Carbon Cycle Response to Increased Sulfide Weathering Due to Oxygen Feedback

由于氧反馈，碳循环对硫化物风化增加的响应有限