NSFGEO-NERC: Collaborative Research: Developing a new Lower Cretaceous time scale: Foundation for the next generation of paleoceanographic and biogeochemical studies

NSFGEO-NERC：合作研究：制定新的下白垩世时间尺度：下一代古海洋学和生物地球化学研究的基础

• 批准号: 1951812
• 负责人: Bradley Singer
• 金额: $ 48.29万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-11-15 至 2024-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1951812&HistoricalAwards=false
• 关键词: NSFGEO; NERC; Collaborative; Research; Developing

The Cretaceous was a time of global warming during which atmospheric carbon dioxide levels surpassed 800 ppm, similar to those predicted for 2100 by “business-as-usual” emission scenarios. Cretaceous rocks record high sea levels, high biological productivity, massive volcanism, and major perturbations of the carbon cycle during several ocean anoxic events (OAEs). Understanding these phenomena can provide deep-time analogs for future greenhouse scenarios. Marine sediments that record these crises are globally widespread but weaving these records into a common temporal framework is essential if they are to reveal the causes. This project aims to generate a new temporal framework spanning 125 to 93 million years ago during which several major OAEs occurred. This will permit examination of repeated deteriorations of marine ecosystems across the Pacific, Atlantic, and Mediterranean oceans. The team will be involved in novel outreach, international collaboration, and training of future earth science leaders. They will bring deep-time science to the public via presence at the Sturgis Motorcycle Rally. The favored hypothesis for ocean anoxic events involves volcanic initiation leading to a cascade of processes amplifying global marine production; key factors are the nature of volcanism and the source of increased nutrients. Yet geographic differences in proxy records (Carbon and Osmium isotopes) indicate additional complexities, such as sea level and ocean circulation. The goals for the project are to establish: (1) A new time scale for global geochemical and paleobiologic datasets; (2) Chemostratigraphic correlation of the new time scale to European sections using isotope stratigraphy, and (3) A new global time scale for improved understanding of major biogeochemical perturbations. The team will: (i) Determine radioisotopic ages of rhyolitic tuffs in sediments of Japan, (ii) Integrate these new ages with new Osmium and Carbon isotope chemostratigraphy in Europe, (iii) Compile global geochemical proxy data for OAE 1a within a common temporal and stratigraphic framework, and analyze trends and patterns from the Pacific to Europe, (iv) Evaluate the volcanic versus climatic/orbital hypotheses for OAE initiation, and (v) Explore the significance of geography in the timing and magnitude of geochemical signals.This is a project that is jointly funded by the National Science Foundation’s Directorate of Geosciences (NSF/GEO) and the National Environment Research Council (UKRI/NERC) of the United Kingdom (UK) via the NSF/GEO-NERC Lead Agency Agreement. This Agreement allows a single joint US/UK proposal to be submitted and peer-reviewed by the Agency whose investigator has the largest proportion of the budget. Upon successful joint determination of an award, each Agency funds the proportion of the budget and the investigators associated with its own investigators and component of the work.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.

白垩纪是一个全球变暖的时期，在此期间，大气中的二氧化碳水平超过了800 ppm，类似于“商业 - 通常”排放场景预测的二氧化碳水平。白垩纪岩石记录了多个海洋缺氧事件（OAE）期间碳循环的高生物生产率，大量火山和主要扰动的记录。了解这些现象可以为未来的温室场景提供深度的类似物。记录这些犯罪的海洋沉积物在全球范围内广泛，但是将这些记录编织成一个共同的临时框架，如果要揭示原因，它们至关重要。该项目旨在生成一个跨越125至9300万年前的新临时框架，在此期间发生了几个主要的OAE。这将允许检查整个太平洋，大西洋和地中海海洋的海洋生态系统的反复缺陷。该团队将参与新颖的外展，国际合作和未来地球科学领袖的培训。他们将通过斯特吉斯摩托车集会的出席将深度的科学带给公众。海洋缺氧事件的首选假设涉及火山启动，导致一系列级联进化，从而扩大了全球海洋生产。关键因素是火山主义的性质和养分增加的来源。然而，代理记录（碳和osmium同位素）的地理差异表明海平面和海洋循环等其他复杂性。该项目的目标是建立：（1）全球地球化学和古生物学数据集的新时间​​尺度； （2）使用同位素层学的新时间尺度与欧洲部分的化学地层相关性，以及（3）一种新的全球时间尺度，以改善对主要生物地球化学扰动的理解。团队将：（i）确定日本沉积物中节奏凝灰岩的放射性病年龄，（ii）将这些新时代与欧洲的新osmium and Carbon同位素化学化学分层相结合，（III）（iii）将OAE 1A的全球地球化学替代数据纳入欧洲的全球地球化学数据，以范围内的临时和地层框架中的PEAIV，并分析（和分析）趋势和模式，并分析（和分析）（和分析）（和分析）（和分析）（和分析）（和分析）（和分析）（和分析）（cormive speciv seprape oae seprapecy oae 1a OAE计划的火山与气候/轨道假设，（v）探索地理学信号的时间和地理学的重要性。该项目由国家科学基金会地球科学基金会（NSF/GEO）（NSF/GEO）和国家环境研究委员会（UKRI/NERC/NERC/NERC）（UKNER-NERS）（UKNEN-KIREN-KIRENS）共同资助。该协议允许该机构提交和同行评审的一项联合提案，其调查员的预算比例最大。成功确定奖励后，每个机构都为预算的比例以及与其自己的研究人员和工作组成部分相关的调查人员提供了资金。该奖项反映了NSF的法定任务，并通过使用该基金会的知识分子优点和更广泛的影响来审查标准，被认为是通过评估来获得的支持。

项目成果

Rapid preservation of Jehol Biota in Northeast China from high precision 40Ar/39Ar geochronology

• DOI: 10.1016/j.epsl.2022.117718
• 发表时间: 2022-09
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: Youjuan Li;B. Jicha;Zhi-Feng Yu;Huaichun Wu;Xiaolin Wang;B. Singer;Huaiyu He;Zhonghe Zhou