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

…主要目标是深入了解基本的地球化学和生物过程。因此，这项研究是植根于矿化-岩石学、喷口流体地球化学-气体化学、生物地球化学-有机地球化学和微生物-动物学等领域的工作组之间密切跨学科合作的框架。本研究旨在阐明热液流体所带来的碳种和还原性气体的转化。其重点有三个目标：(1)了解地层过程和流体各自的组成；(2)描述碳和氢的生物地球化学转化过程；(3)通过绘制喷口流体在时间和空间上的可变性来表征热液旋回性的范围和相关性。为此，测定了主要反应气体甲烷和氢的浓度和同位素特征（C， H），以及碳循环的其他组分，即CO2 - c5碳氢化合物、溶解有机物（DOC）、CO2和生物量。希望编制一套地理上不同的热液系统的综合数据集，包括有关时间变化的信息，以便在对整个系统的模型描述中结合已确定的地球化学和生物过程。

... 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.