Sulphur isotopic investigation of dissolved and solid sulphur phases in fluids, mineral precipitates, sediments and rock samples from the Mid-Atlantic Ridge

对大西洋中脊流体、矿物沉淀物、沉积物和岩石样品中溶解和固态硫相进行硫同位素研究

• 批准号: 16318840
• 负责人: Professor Dr. Harald Strauß
• 金额: --
• 依托单位: Institut für Geologie und Paläontologie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/16318840?language=en
• 关键词: Sulphur; isotopic; investigation; dissolved; solid

The ultimate objective of this research project is a qualitative and quantitative understandingof sulphur cycling at mid-ocean ridges. Abundance and isotope results obtained so far fordifferent sulphur forms in liquid and solid samples from the two principal study sites (i.e.Logatchev hydrothermal field and southern MAR sites) provide evidence for inorganic(leaching of mantle sulphur and high-temperature seawater sulphate reduction) andbiological (reduction of sulphate and elemental sulphur) cycling of a diverse mix of sulphurcompounds, including metastable thiols. Current estimates, in part based on preliminarymultiple sulphur isotope data, point to a 30% contribution from recycled seawater sulphate tothe overall sulphur budget of hydrothermal fluids.Future work will focus on two different aspects: (a) the determination of multiple sulphurisotopes at different spatial resolutions in order to (i) quantify the different sulphurcontributions (i.e. recycled seawater sulphate, leached mantle sulphur, biological sulphurcycling, and (ii) identify the details of sulphur isotope fractionation at mid-ocean ridgehydrothermal settings, and (b) the quantification of sulphur metabolism and associatedisotope effects based on culture experiments with organisms cultivated from the vent sitesstudied.

该研究项目的最终目标是定性和定量地了解洋中脊的硫循环。迄今为止，从两个主要研究地点（即洛加切夫热液田和南部 MAR 地点）获得的液体和固体样品中不同硫形态的丰度和同位素结果为无机（地幔硫浸出和高温海水硫酸盐还原）和生物（硫酸盐和元素硫的还原）各种硫化合物混合物（包括亚稳态硫醇）的循环。目前的估计部分基于初步的多种硫同位素数据，表明回收的海水硫酸盐对热液总硫预算的贡献为 30%。未来的工作将集中在两个不同的方面：(a) 不同空间的多种硫同位素的测定决议，以便 (i) 量化不同的硫贡献（即再循环海水硫酸盐、淋滤地幔硫、生物硫循环和(ii) 确定大洋中脊热液环境中硫同位素分馏的细节，以及 (b) 根据从所研究的喷口地点培养的生物体进行培养实验，对硫代谢和相关同位素效应进行量化。