Gas chemistry and carbon cycling at hydrothermal systems along the Mid-Atlantic Ridge: time- and space-referenced biogeochemical and isotopic investigations

大西洋中脊沿热液系统的气体化学和碳循环：时间和空间参考的生物地球化学和同位素研究

• 批准号: 5416317
• 负责人: Dr. Richard Seifert (†)
• 金额: --
• 依托单位: GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5416317?language=en
• 关键词: Gas; chemistry; carbon; cycling; hydrothermal

... Main goal is to obtain insight into the essential geochemical and biological processes. Thus, the study stands in the frame of a close interdisciplinary co-operation between working groups rooted in the fields of mineralisation - petrology, geochemistry of vent fluids - gas chemistry, biogeochemistry - organic geochemistry, and microbiology-zoology. This study aims to elucidate the transformation of carbon species and reduced gases brought along by hydrothermal fluids. Three goals are in its focus (i) to understand formation processes and the respective composition of fluids (ii) to describe the biogeochemical transformation processes of carbon species and hydrogen (iii) characterisation of extend and relevance of hydrothermal cyclicity by charting the variability of vent fluids in time and space. For this purpose, concentrations and isotope signatures (C, H) of the main reactive gases methane and hydrogen as well as of other components of the carbon cycle namely C2-C5 hydrocarbons, dissolved organic matter (DOC), CO2, and biomass are determined. It is aspired to compile a comprehensive data set for geographically apart hydrothermal systems including information on temporal variation that allows to combine the identified geochemical and biological processes in model description of the total system.

...主要目标是深入了解基本的地球化学和生物过程。因此，这项研究站在一个密切的跨学科合作的框架内，工作组植根于矿化-岩石学，喷口流体地球化学-气体化学，地球化学-有机地球化学和微生物-动物学领域。本研究旨在阐明热液流体携带沿着的碳物种和还原气体的转化。其重点有三个目标：（一）了解形成过程和流体的各自组成;（二）描述碳物种和氢的地球化学转化过程;（三）通过绘制喷口流体在时间和空间上的变异性来表征热液循环的范围和相关性。为此，测定主要反应气体甲烷和氢气以及碳循环的其它组分（即C2-C5烃、溶解有机物（DOC）、CO2和生物质）的浓度和同位素特征（C、H）。希望为地理上分散的热液系统汇编一套全面的数据，包括关于时间变化的信息，以便在整个系统的模型描述中将已确定的地球化学和生物过程联合收割机结合起来。