Abstract

Rare earth elements (REEs) and Nd isotopes are useful tracers for a variety of oceanic processes in both modern and past oceans. This presentation will cover some latest understanding of the marine cycling of REEs and Nd isotopes gained through the international GEOTRACES effort. In particular, I will present results of dissolved REE concentrations along ~12°S in the South Atlantic – the first full-depth zonal section of REEs across a major ocean basin. The section provides new insights into the REE cycling associated with a couple of prominent oceanic features, including oxygen minimum zone and hydrothermal venting. Using combined dense measurements and water mass mixing modeling developed upon the optimal multiparameter analysis, the relative control of water mass mixing and biogeochemical processes on the REE distributions in the South Atlantic has been quantified for the first time. In addition, I will present some new results of applying Nd isotopes to trace changes in ocean circulation during the Cretaceous. The new Nd isotope records reveal a tight coupling between ocean circulation and the global carbon cycle during the Cretaceous, and have important implications to the origin and maintenance of Cretaceous oceanic anoxic events (OAEs).

____________________________________________________

本次午餐会将为报名参加的师生提供午餐，所有午餐会的报名都通过网络进行。请老师同学们访问MEL网页（http://mel.xmu.edu.cn/lecture.asp?id=1），在本次午餐会的“报名”一栏填写并提交。

本讲座将发布当天仅开放给科研人员、技术人员、博士后、访问学者等教师优先报名，第二天起开放给全体师生报名。学生应在规定时间内报名，如提前以教师的名义报名，将导致报名无效。

本周五下午4点为截止报名时间，总报名人数限制在100名以内。如未及时报上名，可于12:20直接到场听报告。如已报名但因事不能参加，也请在周五下午4点前告知。

午餐会一如既往地欢迎大家的关注，如有兴趣做讲座的老师。欢迎与我们联系。