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首页> 外文期刊>Geochemistry, geophysics, geosystems >Tracking Water-Rock Interaction at the Atlantis Massif (MAR, 30°N) Using Sulfur Geochemistry
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Tracking Water-Rock Interaction at the Atlantis Massif (MAR, 30°N) Using Sulfur Geochemistry

机译：使用Sulfur Geochemisty跟踪Atlantis Massif（MAR，30°N）的水岩相互作用

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Hydrothermal alteration and serpentinization of ultramafic rocks at oceanic core complexes involve extensive element exchange between fluid and rock and a wide range of biogeochemical processes. These processes influence the global sulfur cycle due to both biogenic and abiogenic removal of seawater sulfate. Hence, ocean floor serpentinization connects the hydrosphere, biosphere, and lithosphere. This work presents a study of the sulfur geochemistry of highly altered mafic and ultramafic samples from the Atlantis Massif located at 30°N along the Mid-Atlantic Ridge. The analyzed samples were drilled during International Ocean Discovery Program Expedition 357 and collected during Alvin dives in 2000, 2003, and 2005. Multiple sulfur isotope analyses of sulfide and sulfate phases indicate that several processes took place during progressive hydrothermal alteration: (1) incorporation of seawater sulfate, (2) thermochemical sulfate reduction during interaction with high-temperature (high-T; 350-400 °C), low-pH fluids and input of H_2S derived from leaching gabbroic intrusions, (3) microbial sulfate reduction, and (4) oxidation of sulfides at high water-rock ratios. Petrological examinations show that high-T fluids mostly postdated the bulk serpentinization and that these fluid pulses were relatively localized (1 dm scale) resulting in a highly heterogeneous mineralogy. Locally, high-T fluid influx took place subsequent to microbial sulfate reduction and oxidation as indicated by geochemical modeling. Overall, this study documents the complex interplay of magmatic processes, fluid-rock interaction, and microbial activity that take place during the formation of oceanic core complexes and where mantle rocks are exposed to seawater.
机译：海洋核心复合物中超空地岩石的水热改变和蛇形化涉及流体和岩石之间的广泛元素交换以及各种生物地球化学过程。由于硫酸盐的生物和致力去除，这些过程影响了全球硫循环。因此，海底蛇形化连接水层，生物圈和岩石圈。这项工作提出了从亚特兰蒂斯的高度改变的MAFIC和超麦克风样品的硫磺地球化学研究，沿着大西洋中间脊30°。在国际海洋发现节目探险之357期间钻探分析的样品，2000年，2003年和2005年的Alvin潜水期间收集。硫化物和硫酸盐阶段的多个硫同位素分析表明，在逐步的水热改变过程中发生了几种过程：（1）纳入海水硫酸盐，（2）与高温（高T; 350-400℃）相互作用的热化学硫酸盐，低pH流体和衍生自浸出虎水侵犯的H_2的输入，（3）微生物硫酸盐还原，（ 4）在高水岩比下氧化硫化物。岩石学检查表明，高T液体主要封​​闭散列素化，并且这些流体脉冲相对局部化（＆ 1 dm刻度），导致高度异质的矿物学。局部地，在地球化学建模的微生物硫酸盐还原和氧化之后发生高T液流量。总的来说，本研究记录了在形成海洋核心复合物的形成过程中进行的岩浆过程，流体岩相互作用和微生物活性的复杂相互作用，以及披风岩石暴露于海水的情况下。

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