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.

本研究将利用中新世铁锰氧化物涂层和鱼牙齿中Nd同位素组成的变化，以确定中晚中新世深海环流的变化可能引起的构造变化在窗台深度在中美洲海道。PI表明，根据先前的调查，Nd同位素记录在这样的沉积物库是不同的古水团（NADW，AABW，AAIW）的指标。这个时间间隔是由于巴拿马地峡的隆起和一系列碳酸盐溶解事件在不同的地方连续看到的兴趣。这些碳酸盐崩溃的时间间隔已被归因于腐蚀性太平洋/南部组成沃茨和非腐蚀性北大西洋深水的干预保存间隔的优势。该研究将使用Nd同位素比率追踪在这一关键时间间隔内一组岩心中北大西洋与太平洋/南大洋的贡献。