COLLABORATIVE RESEARCH: The Permian -Triassic Transition in Antarctica: Evaluating the Rates and Variability of Carbon Isotope Fluctuatios in Terrestrial Organic Matter

合作研究：南极洲的二叠纪-三叠纪转变：评估陆地有机质中碳同位素波动的速率和变异性

• 批准号: 0636824
• 负责人: Matthew Saltzman
• 金额: $ 29.16万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0636824&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Permian; Triassic; Transition

This project studies the Permian-Triassic extinction event as recorded in sedimentary rocks from the Transantarctic Mountains of Antarctica. Two hundred and fifty million years ago most life on Earth was wiped out in a geologic instant. The cause is a subject of great debate. Researchers have identified a unique stratigraphic section near Shackleton glacier laid down during the extinction event. Organic matter from these deposits will be analyzed by density gradient centrifugation (DGC), which will offer detailed information on the carbon isotope composition. The age of these layers will be precisely dated by U/Pb-zircon-dating of intercalated volcanics. Combined, these results will offer detailed constraints on the timing and duration of carbon isotope excursions during the extinction, and offer insight into the coupling of marine and terrestrial carbon cycles. The broader impacts of this project include graduate and undergraduate student research, K12 outreach and teacher involvement, and societal relevance of the results, since the P/T extinction may have been caused by phenomena such as methane release, which could accompany global warming.

该项目研究了来自南极洲跨巨山山脉的沉积岩中记录的二叠纪三叠纪灭绝事件。 200万年前，地球上的大多数生命都是在地质瞬间消灭的。原因是辩论的主题。研究人员已经确定了在灭绝事件中Shackleton冰川附近的独特地层区域。这些沉积物中的有机物将通过密度梯度离心（DGC）分析，该密度梯度离心（DGC）将提供有关碳同位素组成的详细信息。这些层的年龄将通过插入火山的U/PB-Zircon的日期准确地延续。这些结果结合在一起，将对灭绝期间碳同位素偏移的时间和持续时间提供详细的约束，并深入了解海洋和陆地碳周期的耦合。该项目的更广泛影响包括研究生和本科生研究，K12外展和教师参与以及结果的社会相关性，因为P/T灭绝可能是由诸如甲烷释放之类的现象引起的，例如甲烷释放可能伴随全球变暖。