The past and present trace metal budget of the Black Sea - A comparison of the Holocene and Eemian marine ingression

该项目的目标是重建尚未研究的黑海伊米亚腐蚀物的气候和古环境历史，该腐蚀物是在DSDP Leg 42B站点379A和流星巡航M72/5期间发现的。我们的目标是通过多学科方法高分辨率地比较伊米亚腐蚀物和现代(全新世)腐蚀物，提高对黑海古环境发展的认识。我们希望通过这一提议实现的主要目标是：a)建立迄今未被研究的伊米亚腐蚀带的高分辨率化学地层学分类；b)重建化学/化学跃层的发育；c)调查黑海从湖相到海洋阶段(反之亦然)的过渡；d)重建古生产力；d)研究从水柱到沉积物的痕量金属通量随时间的同位素质量平衡。为了实现这些目标，我们将在关键剖面高分辨率地测定无机地球化学参数(主元素和次要元素)、稳定的金属同位素(Fe、Mo和U)和有机生物标志物(异角叉烯)。我们的研究结果也将被用来比较黑海腐蚀物和来自地中海的伊米亚S5腐蚀物，试图找出两种环境的异同。

The goal of this project is to reconstruct the climatic and paleoenvironmental history of the yet unstudied Eemian sapropel in the Black Sea, which was recovered during DSDP Leg 42B Site 379A and Meteor cruise M72/5. We aim to improve the knowledge about the paleoenvironmental development of the Black Sea by comparing the Eemian with the recent (Holocene) sapropel using geochemical proxies at high resolution in a multidisciplinary approach. The main objectives we want to achieve with this proposal are a) the creation of a highresolution chemostratigraphic classification of the so far unstudied Eemian sapropel, b) reconstruction of the development of the chemo-/pycnocline, c) investigation of the transition from the limnic to the marine stage (and vice versa) in the Black Sea, d) reconstruction of paleoproductivity and d) an isotopic mass balance of trace metal fluxes from the water column to the sediment through time. To achieve these goals we will determine inorganic geochemical parameters (major and minor elements), stable metal isotopes (Fe, Mo, and U), and organic biomarkers (isorenieratene) at high resolution in key sections. The results of our study will also be used to compare the Black Sea sapropels with the Eemian “S5” sapropel from the Mediterranean Sea in an attempt to work out similarities and differences of the two settings.