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首页> 外文期刊>Journal of Asian earth sciences >Formation of Fe-Mn-Si oxide and nontronite deposits in hydrothermal fields on the Valu Fa Ridge, Lau Basin
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Formation of Fe-Mn-Si oxide and nontronite deposits in hydrothermal fields on the Valu Fa Ridge, Lau Basin

机译：流域Valu Fa Ridge水热田中Fe-Mn-Si氧化物和白云岩的形成

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摘要

Hydrothermal Fe-Mn-Si oxides and nontronite are pervasive in the Hine Hina, Vai Lili and Mariner hydrothermal fields along the central Valu Fa Ridge, Lau Basin. Morphometric and mineralogical analyses reveal that the iron-rich filaments are the most important constituents of these Fe-Mn-Si oxide deposits. Both the morphologies and chemical composition of the filaments indicate that neutrophilic Fe-oxidizing bacteria have played a key role in the formation of these deposits. A key process of the formation of these deposits is the creation of a complicated filamentous network in which a series of metabolic activities and passive sorption and nucleation processes occur. The precipitation of dissolved Si in unsaturated and sat urated states leads to a "two-generation" growth model in the hydrothermal vents. The precipitation of amorphous opal occurs in a relatively narrow temperature range (41.1-42.9 ℃) based on oxygen isotope analyses, indicating a fast precipitation rate of opal-A when conductive cooling of the hydrothermal fluid occurrs. Patchy nontronite in the Mariner fields is a product of the direct precipitation from hydrothermal fluids at a temperature of ～87.9 ℃, whereas the scattered nontronite at the Hine Hina field is the product of the replacement of hydrothermal Fe-Si oxides at a temperature of ～46.2 ℃.
机译：沿流域Valu Fa Ridge中部的Hine Hina，Vai Lili和Mariner热液领域普遍存在热液Fe-Mn-Si氧化物和绿脱石。形态和矿物学分析表明，富铁丝是这些Fe-Mn-Si氧化物沉积物中最重要的成分。长丝的形态和化学组成均表明中性铁氧化细菌在这些沉积物的形成中起了关键作用。这些沉积物形成的关键过程是创建复杂的丝状网络，其中发生了一系列代谢活动以及被动吸收和成核过程。处于不饱和状态和饱和状态的溶解硅的沉淀导致热液喷口中出现“两代”生长模型。根据氧同位素分析，无定形蛋白石的沉淀发生在相对较窄的温度范围内（41.1-42.9℃），这表明当热液发生传导冷却时，蛋白石-A的沉淀速率很快。水手场中的斑片状绿脱石是在〜87.9℃的温度下从热液中直接析出的产物，而海因Hina场中的散布的绿脱石是在〜℃的温度下替代了水热式Fe-Si氧化物的产物。 46.2℃。

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  • 来源
    《Journal of Asian earth sciences》 |2012年第1期|p.64-76|共13页
  • 作者

    Zhilei Sun; Huaiyang Zhou; G.P. Glasby; Qunhui Yang; Xijie Yin; Jiwei Li; Zhiqiang Chen;

  • 作者单位

    Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, Qingdao 266071, China,Qingdao Institute of Marine Geology, Qingdao 266071, China;

    State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;

    Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, Qingdao 266071, China,Qingdao Institute of Marine Geology, Qingdao 266071, China;

    State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;

    Third Institute of Oceanography State Oceanic Administration, Xiamen 361000, China;

    Southwest Jiaotong University, Chengdu 610031, China;

    Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;

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  • 正文语种 eng
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  • 关键词

    valu fa ridge; hydrothermal vent; Fe-Mn-Si oxides; nontronite; neutrophilic fe-oxidizing bacteria;

    机译：估值法里奇热液喷口;铁锰硅氧化物;囊脱石中性嗜中性氧化细菌;

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