Carbonate Precipitation Induced by Serpentinization on the Mid-Atlantic Ridge

…这个项目的目的是重建这些碳酸盐的成因，并了解触发它们沉淀的因素. ...拟议的项目将测试甲烷衍生碳的生物地球化学循环，特别是甲烷的厌氧氧化是否有利于蛇纹石化过程中的碳酸盐形成。这一过程由(1)热液环境中甲烷厌氧氧化的最新证据和(2)与微生物生物膜相关的13C中大西洋中脊（MAR）方解石的耗尽表明。2004年1月14日至2月13日，在14°40′n ~ 14°55′n范围内的Logatchev热液区3个不同的测点（49、54、67 GTV站）对蛇纹化周期岩和硫化物、橄榄岩中的碳酸盐岩脉进行了自生碳酸盐浸渍。回收的样品最适合拟议的项目。

... It is the aim of this project to reconstruct the genesis of these carbonates and to understand the factors triggering their precipitation. ... The proposed project will test, if biogeochemical cycling of methane-derived carbon and, in particular, anaerobic oxidation of methane favours carbonate formation during serpentinization. This process is indicated by (1) recent evidence for anaerobic oxidation of methane in hydrothermal environments, and (2) Mid-Atlantic Ridge (MAR) calcites depleted in 13C assosicated with mircrobial biofilms. Several rock samples with authigenic carbonate impregnations on serpentinized periodotites and carbonate vein in sulphides and peridotites have been sampled at three different sites (Stations 49, 54, 67 GTV) in the Logatchev Hydrothermal Field between 14°40'N and 14°55'N during R/V Meteor cruise M60/3 (January 14 to February 13, 2004). The recovered samples are most suitable for the proposed project.