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.

马丁摘要这项研究将利用中新世铁锰氧化物涂层和鱼齿中的 Nd 同位素组成变化来确定中新世中晚期深海环流变化，这可能是由中美洲海道基坑深度的构造变化引起的。 PI 表明，根据先前的调查，此类沉积库中记录的 Nd 同位素是不同古水团（NADW、AABW、AAIW）的指标。由于巴拿马地峡的隆起和各地相继发生的一系列碳酸盐溶解事件，该时间间隔令人感兴趣。这些碳酸盐崩溃区间归因于腐蚀性太平洋/南部成分水域的主导地位以及非腐蚀性北大西洋深水的介入保存区间。该研究将使用 Nd 同位素比率来追踪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。