Deep Water Circulation During the Middle to Late Miocene Carbonate Crash

中新世中晚期碳酸盐岩崩塌期间的深水循环

• 批准号: 0451170
• 负责人: Ellen Martin
• 金额: $ 18.65万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-04-15 至 2008-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0451170&HistoricalAwards=false
• 关键词: Deep; Water; Circulation; During; Middle

MartinAbstractThis study will utilize Nd isotopic compositional changes in Miocene Fe-Mn oxide coatings and fish teeth to determine Middle and Late Miocene deep ocean circulation changes potentially caused by tectonic changes in sill depth at the Central American seaway. The PI suggests that based on prior investigations Nd isotopes recorded in such sedimentary repositories are indicators of different paleo water masses (NADW, AABW, AAIW). This time interval is of interest due to the uplift of the Panama Isthmus and a series of carbonate dissolution events seen successively in various places. These carbonate crash intervals have been attributed to dominance of corrosive Pacific/Southern Component Waters and the intervening preservation intervals to non-corrosive North Atlantic Deep Water. The study will use Nd isotope ratios to trace North Atlantic vs Pacific/Southern Ocean contributions in a set of cores over this critical time interval.

Martinabtrestractthis的研究将利用中新世Fe-Mn氧化物涂层和鱼牙的同位素组合物变化，以确定中新世深海循环中的中期和晚期，可能是由于中美洲海道中裂缝深度的构造变化引起的。 PI表明，基于先前的研究，记录在此类沉积存储库中的同位素是不同古水质量（NADW，AABW，AAIW）的指标。由于巴拿马地峡的提升和一系列在各个地方看到的碳酸盐溶解事件，因此此时间间隔引起了人们的关注。这些碳酸盐崩溃的间隔归因于腐蚀性太平洋/南部组件水域的主导地位以及非腐败北大西洋深水的中间保存间隔。该研究将在此关键时间间隔内使用ND同位素比在一组核心中追踪北大西洋与太平洋/南大洋的贡献。