Diagenesis and CaCO3 Dissolution on the Ceara Rise, Equatorial Atlantic

本研究项目是对CaCO 3溶解的研究， 沉积物中有机物的好氧降解 被过饱和的底层沃茨覆盖。 工作重点是 确定在一定范围内发生的溶解量， 深度和饱和状态。 采样分析方案为 旨在研究氧化有机物的化学计量， 物质降解/CaCO 3溶解，以限制速率常数 通过分析和建模， 沉积碳酸钙溶解的平衡常数。 的 野外地点是塞阿拉隆起， 上升到相邻楼层将成为孔隙水的来源 有机生产过程中产生或消耗的化学物种概况 碳氧化和CaCO 3溶解。 样本将被采集 通过现场的全岩心挤压机。 这项工作正在 与Reimers研究孔隙水的单独项目协调 使用微电极剖面仪技术在现场进行化学分析， 另一个由Jahnke测量相同参数的底栖通量 有一个海底通量室

This research project is a study of the dissolution of CaCO3 that results from the oxic degradation of organic matter in sediments overlain by supersaturated bottom waters. The work centers on determining the amounts of dissolution occurring over a range of depths and saturation states. The sampling and analysis scheme is designed to permit study of the stoichiometry of oxic organic matter degradation/CaCO3 dissolution, to constrain the rate constant of dissolution through analysis and modelling, and to evaluate the equilibrium constant for dissolution of sedimentary CaCO3. The field site is the Ceara Rise, and a transect from the crest of the Rise to the adjacent floor will be the source of pore water profiles of chemical species produced or consumed during organic carbon oxidation and CaCO3 dissolution. The samples will be taken by means of an in situ Whole Core Squeezer. This work is being coordinated with a separate project by Reimers to study pore water chemistry at the site with a microelectrode profiler technique, and another by Jahnke to measure benthic fluxes of the same parameters with a benthic flux chamber.