Sedimentary Response of Large Lakes to Climate Change: Direct Measurement Using High-Precision 40-Argon/39-Argon Geochronology

大型湖泊对气候变化的沉积响应：使用高精度 40-Argon/39-Argon 地质年代学进行直接测量

• 批准号: 0081852
• 负责人: Bradley Singer
• 金额: $ 12.45万
• 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: 2000
• 资助国家: 美国
• 起止时间: 2000-08-01 至 2002-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0081852&HistoricalAwards=false
• 关键词: Sedimentary; Response; Large; Lakes; Climate

This award provides support for a study of the numerous tuff layers interbedded in the Early to Middle Green River Formation, which offer an opportunity to establish the most precise terrestrial geochronologic record of climate change available for any pre-Quaternary deposit. These sediments have been interpreted to reflect climate fluctuations ranging from annual varves, to 21,000 yr and 100,000 yr astronomical cycles, to longer-term climate changes. In the absence of precise temporal control, however, these inferences have yet to be verified. The project is a cross-disciplinary investigation of the sedimentology, stratigraphy, and precise 40Ar/39Ar radioisotope chronology of the Wilkins Peak and Laney Members of the Green River Formation, aimed at documenting rates of sediment accumulation and the absolute timing of expansions of Lake Gosiute.

该奖项为研究早中期绿色河地层中的众多凝灰岩层提供了支持，这为建立任何前第四纪存款的气候变化的最精确的陆地地质年代学记录提供了机会。这些沉积物已被解释为反映气候波动，从每年的纹层，到21,000年和100,000年的天文周期，再到长期的气候变化。然而，在缺乏精确的时间控制的情况下，这些推论还有待验证。该项目是对绿色河组的威尔金斯峰和兰尼成员的沉积学、地层学和精确的40 Ar/39 Ar放射性同位素年代学的跨学科调查，旨在记录沉积物积累速率和戈休特湖扩张的绝对时间。