Trace elements and metal isotopes: Transformation and fractionation

微量元素和金属同位素：转化和分馏

• 批准号: 453339775
• 负责人: Professorin Dr. Katharina Pahnke-May
• 金额: --
• 依托单位: Institut für Chemie und Biologie des Meeres (ICBM)
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/453339775?language=en
• 关键词: Trace; elements; metal; isotopes; Transformation

DynaDeep will unravel the functionality and relevance of marine-terrestrial interactions below high-energy beaches, where we propose the deep subsurface to act as a dynamic bioreactor and unique microbial habitat affecting elemental net fluxes to the sea. To reach this goal, six subprojects will cooperate in joint field campaigns, shared sampling approaches as well as experimental work and use mathematical models in an integrative approach. Subproject P4 will study trace element and metal isotope dynamics related to biogeochemical processes in the subterranean estuary (STE) on Spiekeroog Island. We hypothesise that overlapping redox zones, dynamic changes in microbial activity and spatially and temporally changing redox and salinity interfaces create distinct trace element and isotope records in high-energy beach systems. P4 will measure trace element concentrations (Fe, Mn, Co, Mo, Re, Tl, U, V, rare earth elements) and Fe and Mo isotope signatures in (pore)water and sediment samples. Regular field sampling will give insight into spatio-temporal variations of trace element and isotope patterns under varying boundary conditions. Laboratory incubation experiments will be used to determine trace element mobilisation, retention and isotope fractionation rates in order to understand the physico-chemical and microbial changes driving these reactions in the dynamic deep to shallow subsurface of the STE in detail. Trace element and supplementary major ion, nutrient and total alkalinity data will be provided for mathematical modelling (P1, P6), rate measurements (P2) and biogeochemical investigations carried out in P3 and P5 to collaboratively assess how trace element and metal isotope transformation and fractionation are interconnected with water source and age, redox conditions and organic matter and microbial community characteristics.

DynaDeep将揭示高能海滩下海洋-陆地相互作用的功能和相关性，在那里，我们建议深层地下作为一个动态的生物反应器和独特的微生物栖息地，影响元素净通量到海洋。为实现这一目标，六个分项目将在联合实地活动、共享取样方法以及实验工作方面进行合作，并以综合方法使用数学模型。分项目P4将研究与Spiekeroog岛地下河口（STE）地球化学过程有关的微量元素和金属同位素动态。我们假设，重叠的氧化还原带，微生物活动的动态变化和时空变化的氧化还原和盐度界面创建不同的微量元素和同位素记录在高能海滩系统。P4将测量（孔隙）水和沉积物样品中的微量元素浓度（Fe、Mn、Co、Mo、Re、Tl、U、V、稀土元素）以及Fe和Mo同位素特征。定期实地采样将使人们了解在不同边界条件下微量元素和同位素模式的时空变化。实验室培养实验将用于确定微量元素的动员，保留和同位素分馏率，以了解物理化学和微生物的变化，驱动这些反应在动态深到浅的地下的STE详细。将为数学建模（P1、P6）、速率测量（P2）以及P3和P5中进行的生物地球化学调查提供微量元素和补充主要离子、营养物和总碱度数据，以协同评估微量元素和金属同位素转化和分馏与水源和年龄、氧化还原条件、有机质和微生物群落特征之间的相互关系。