Experimental carbonate geochemistry and early diagenesis

我的研究主要集中在水生系统的生态地球化学过程的机制和速率。该方法使用现场研究，控制实验室实验和建模。我的研究将在两个方面进行：碳酸盐地球化学和沉积物成岩作用。这两个项目密切相关，因为碳酸盐矿物是沉积物的常见成分，并被广泛用作推断古环境条件和沉淀溶液化学性质的代用品。 碳酸盐矿物的表面具有高度活性，在确定各种水生环境（含水层，沉积物，尾矿）中微量元素的流动性方面发挥着重要作用。 长期目标是建立碳酸盐矿物在各种环境条件下的吸附（吸附和共沉淀）行为和反应性的预测模型。除了在“理想”矿物表面的反应，我计划采取更务实的方法，并调查细菌对碳酸盐矿物反应动力学和矿物学的影响。细菌普遍存在于水生环境中，并且可以在大多数矿物表面上发现，然而，它们对风化速率和碳酸盐沉淀物的矿物学的影响尚未得到适当的研究。 通过海洋水柱燃料沉降的颗粒，参与并受到沉积物中的许多地球化学过程的影响。这项研究计划的长期目标是确定控制沉积物-水界面元素通量的因素，并更好地利用沉积记录来推断古环境条件。我将专注于地球化学行为的选择氧化还原敏感的元素（如铁，锰，钼，U和Re）在沉积物中，如何以及如何快速地集中或耗尽在沉积物中的各种条件下的氧化作用，以及如何在沉积物中的分布可以用来推断过去的沉积环境的条件。

My research focuses on the mechanisms and rates of biogeochemical processes in aquatic systems. The approach uses field studies, controlled laboratory experiments, and modeling. My research will be carried out on two fronts: carbonate geochemistry and sediment diagenesis. The two programs are intimately linked since carbonate minerals are common constituents of sediments and widely used as proxies to infer the paleo-environmental conditions and the chemistry of the solutions from which they precipitated. The surfaces of carbonate minerals are highly reactive and play an important role in determining the mobility of trace elements in a variety of aquatic environments (aquifers, sediments, mine tailings). The long-term objective is to develop a predictive model of the sorption (adsorption and co-precipitation) behavior and reactivity of carbonate minerals under various environmental conditions. In addition to reactions at "ideal" mineral surfaces, I plan to take a more pragmatic approach and investigate the influence of bacteria on carbonate mineral reaction kinetics and mineralogy. Bacteria are ubiquitous in aquatic environments and can be found on most mineral surfaces, yet, their influence on weathering rates and the mineralogy of carbonate precipitates has not been properly investigated. Particles that settle through the oceanic water column fuel, participate in, and are subjected to, a number of biogeochemical processes in the sediment. The long-term goal of this research program is to identify factors that control elemental fluxes across the sediment-water interface and better exploit the sedimentary record to infer paleo-environmental conditions. I will focus on the geochemical behaviour of selected redox-sensitive elements (e.g. Fe, Mn, Mo, U, and Re) in sediments, how and how fast they are concentrated or are depleted in sediment under various conditions of oxygenation and how their distribution in the sediment can be used to infer the conditions of past depositional environments.