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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Fluid sources, fluid pathways and diagenetic reactions across an accretionary prism revealed by Sr and B geochemistry
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Fluid sources, fluid pathways and diagenetic reactions across an accretionary prism revealed by Sr and B geochemistry

机译：锶和硼地球化学揭示的增生棱镜上的流体来源，流体路径和成岩反应

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摘要

ODP Leg 204, which drilled at Hydrate Ridge, provides unique insights into the fluid regime of an accretionary complex and delineates specific sub-seafloor pathways for fluid transport. Compaction and dewatering due to smectite-illite transition increase with distance from the toe of the accretionary prism and bring up fluids from deep within the accretionary complex to sampled depths (<= 600 mbsf). These fluids have a distinctly non-radiogenic strontium isotope signature indicating reaction with the oceanic basement. Boron isotopes are also consistent with a deep fluid source that has been modified by desorption of heavy boron as clay minerals change from smectite to illite. One of three major horizons serves as conduit for the transport of mainly fluid. Our results enable us to evaluate fluid migration pathways that play important roles on massive gas hydrate accumulations and seepage of methane-rich fluids on southern Hydrate Ridge. (c) 2005 Elsevier B.V All rights reserved.
机译：在Hydrate Ridge钻探的ODP Leg 204提供了对增生复合物流体状态的独特见解，并描绘了用于流体运输的特定海底路径。蒙脱石-伊利石过渡引起的压实和脱水随着距增生棱镜趾部的距离的增加而增加，并将流体从增生复合体内的深处带到采样深度（<= 600 mbsf）。这些流体具有明显的非放射性锶同位素特征，表明与海洋基底发生了反应。硼同位素也与深层流体源一致，深层流体源已通过重质硼的解吸而改变，因为粘土矿物从蒙脱石变为伊利石。三个主要层之一是主要流体输送的管道。我们的结果使我们能够评估在大量水合物聚集和南部水合物岭上富含甲烷的流体渗漏中起重要作用的流体迁移途径。 （c）2005 Elsevier B.V保留所有权利。

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