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首页> 外文期刊>Journal of Asian earth sciences >Major cation/chlorine ratio and stable chlorine isotopic compositions of sediment interstitial water in the Brazos-Trinity Basin Ⅳ from the Gulf of Mexico (IODP 308)
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Major cation/chlorine ratio and stable chlorine isotopic compositions of sediment interstitial water in the Brazos-Trinity Basin Ⅳ from the Gulf of Mexico (IODP 308)

机译：墨西哥湾Brazos-Trinity盆地Ⅳ中沉积物间隙水的主要阳离子/氯比和稳定的氯同位素组成（IODP 308）

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摘要

Interstitial water from the Integrated Ocean Drilling Program Expedition 308 (IODP 308), drilling in the Brazos-Trinity Basin Ⅳ on the slope of Gulf of Mexico, were analyzed for major anion and cation concentrations and δ~(37)Cl isotopic compositions. In the Brazos-Trinity Basin Ⅳ, interstitial water samples from the Hole U1319 show chlorine content mostly centering around 560 mM, and δ~(37)Cl values from -0.81‰ to +0.71‰ with an average of -0.1‰, which are close to the seawater values (0‰). Integrated with the Na/Cl and Br/Cl ratios, the low δ~(37)Cl of interstitial water show no relationship with the dissolution of halite or addition of relict brine. The concentrations of K~+, Na~+, Ca~(2+) and Mg~(2+) in the interstitial water show a similar decreasing pattern at shallow depths, reaching minima at ～13.5 m, corresponding to the alkalinity maximum. Relationships between alkalinity and Na~+, K~+, Ca~(2+), Mg~(2+) concentrations suggest that only Ca~(2+) concentration being controlled by the precipitation of diagenetic carbonates, while Na~+, K~+ and Mg~(2+) concentrations can be used as a geochemical indicator to reveal the fluid processes in the sedimentary basin. Abnormity low Na/Cl, K/Cl, and Mg/Cl ratios of interstitial water show a strong link to well-known cycles of sea level change to well imaged deposits in the fill of Brazos-Trinity Basin Ⅳ, which suggests that a lateral fluid with low cation/Cl ratios was probably intruded in the sediment strata during low stand sea level period in the basin.
机译：分析了在墨西哥湾的斜坡上的布拉索斯三叉戟盆地Ⅳ进行的海洋综合钻探计划308（IODP 308）的间隙水中的主要阴离子和阳离子浓度以及δ〜（37）Cl同位素组成。在Brazos-Trinity盆地Ⅳ中，U1319孔的间隙水样品中的氯含量主要集中在560 mM附近，δ〜（37）Cl值从-0.81‰至+ 0.71‰，平均为-0.1‰，分别为接近海水值（0‰）。与Na / Cl和Br / Cl的比率相结合，间隙水的低δ〜（37）Cl与盐岩的溶解或残留盐水的添加没有关系。间隙水中K〜+，Na〜+，Ca〜（2+）和Mg〜（2+）的浓度在浅层深度表现出相似的下降规律，在〜13.5m处达到最小值，对应于碱度最大值。碱度与Na〜+，K〜+，Ca〜（2 +），Mg〜（2+）浓度之间的关系表明，仅Ca〜（2+）浓度受成岩碳酸盐的沉淀控制，而Na〜+， K〜+和Mg〜（2+）的浓度可以作为地球化学指标，揭示沉积盆地中的流体过程。间隙水中Na / Cl，K / Cl和Mg / Cl的异常低值与Brazos-Trinity盆地Ⅳ填充物中海平面变化与成像良好的沉积物的众所周知的循环有很强的联系，这表明在盆地的低位海平面时期，低阳离子/氯比的流体可能侵入了沉积物地层。

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  • 来源
    《Journal of Asian earth sciences》 |2013年第25期|42-50|共9页
  • 作者

    Yan-Ping Li; Shao-Yong Jiang;

  • 作者单位

    State Key Laboratory for Mineral Deposits Research and Center for Marine Geochemistry Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, PR China,Ministry of Education Key Laboratory for Coast and Island Development, Nanjing University, Nanjing 210093, PR China;

    State Key Laboratory for Mineral Deposits Research and Center for Marine Geochemistry Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, PR China;

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  • 正文语种 eng
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  • 关键词

    cation and anion concentrations; chlorine isotopes; interstitial water; brazos-trinity basin Ⅳ; gulf of mexico;

    机译：阳离子和阴离子浓度;氯同位素间隙水;黄铜三位一体盆地Ⅳ;墨西哥湾;

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