Geochemistry of Redox-Sensitive Metals in Marine Sediments

该项目将利用数据和模型对氧化还原敏感的痕量金属(Fe、Mn、Mo、V、U、Re、Cd)的成岩作用与沉积物氧化态之间的关系进行量化描述。将为智利边缘经历一系列氧化状态的一套沉积物岩心生成沉积物固相和孔隙水数据，这些数据将用于评估成岩模型。然后，该模型将应用于底水氧、有机碳通量和沉降率的全球数据库，以确定金属的自生通量。主要目标是(1)发展根据沉积物金属数据预测底水氧水平和有机碳通量的定量能力，以及(2)得出现在和最近地质过去对沉积物和底水之间的全球金属通量的估计。***

This project will use data and modeling to develop a quantified description of the relationship between the diagenesis of redox-sensitive trace metals (Fe, Mn, Mo, V, U, Re, Cd) and sediment oxidation state. Sediment solid- phase and pore-water data will be generated for a suite of sediment cores from the Chile margin that experience a range of oxidation states, and the data will be used to assess a diagenetic model. The model will then be applied to a global database of bottom-water oxygen, organic carbon flux and sedimentation rate to determine authigenic fluxes of the metals. Key goals are (1) to develop a quantitative capability to predict bottom-water oxygen levels and organic carbon flux from sediment metal data and (2) to derive estimates of global metal fluxes between sediments and bottom waters in the present and recent geologic past. ***