Experimental verification of anomalous chloride enrichment related to methane hydrate formation in deep-sea sediments

Authors

  • Jiwoong Seol,

    1. Dept. of Chemical and Biomolecular Engineering (BK21 program) and Graduated School of EEWS, KAIST, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea
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  • Dong-Yeun Koh,

    1. Dept. of Chemical and Biomolecular Engineering (BK21 program) and Graduated School of EEWS, KAIST, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea
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  • Minjun Cha,

    1. Dept. of Chemical and Biomolecular Engineering (BK21 program) and Graduated School of EEWS, KAIST, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea
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  • Woongchul Shin,

    1. Dept. of Chemical and Biomolecular Engineering (BK21 program) and Graduated School of EEWS, KAIST, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea
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  • Young-Joo Lee,

    1. Korea Institute of Geoscience and Mineral Resources, Gwahang-no 92, Yuseong-gu, Daejeon 305-350, Republic of Korea
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  • Ji-Hoon Kim,

    1. Korea Institute of Geoscience and Mineral Resources, Gwahang-no 92, Yuseong-gu, Daejeon 305-350, Republic of Korea
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  • Jaehyoung Lee,

    1. Korea Institute of Geoscience and Mineral Resources, Gwahang-no 92, Yuseong-gu, Daejeon 305-350, Republic of Korea
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  • Huen Lee

    Corresponding author
    1. Dept. of Chemical and Biomolecular Engineering (BK21 program) and Graduated School of EEWS, KAIST, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea
    • Dept. of Chemical and Biomolecular Engineering (BK21 program) and Graduated School of EEWS, KAIST, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea
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Abstract

Anomalous chloride concentration enrichment has been detected in marine sediments comprising methane hydrates (MHs). In this study, we designed an electric circuit system linked to the high-pressure resistance cell in which the chloride ion concentration can be directly measured within reliable accuracy under in situ conditions of the deep-sea floor pressure and temperature. Chloride concentration increased under a fast MH formation rate, but no noticeable concentration change was detected under a relatively low-rate. Furthermore, we suggested that the MH formation rate must be maintained at least ∼102 mol m−2 yr−1 so as to efficiently enrich chlorides and retain the acquired chlorinity. The present experimental system dose not fully reflect the relatively minor effective variables such as vertical advections in real system, but the results seem to be sufficient for revealing chloride enrichment phenomena induced by fast MH formation rate with free methane gas. © 2011 American Institute of Chemical Engineers AIChE J, 2012

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