Geochemistry of Redox-Sensitive Metals in Marine Sediments

小行星9730568 本项目将利用数据和模型对氧化还原敏感的微量金属（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定量描述。 将为智利边缘的一套沉积物岩心生成沉积物固相和孔隙水数据，这些岩心经历了一系列氧化状态，这些数据将用于评估成岩模型。 然后将该模型应用于全球底层水氧、有机碳通量和沉积速率数据库，以确定金属的自生通量。 主要目标是：（1）发展从沉积物金属数据预测底层水氧含量和有机碳通量的定量能力;（2）估算当前和近期地质历史中沉积物和底层沃茨之间的全球金属通量。

9730568 Archer This project will use data and modeling to develop a quantified description of the relationship between the diagenesis of redox-sensitive trace metal (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.