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Determination of in-situ dissolved inorganic carbon and alkalinity in marine sedimentary interstitial water.

机译:测定海洋沉积间隙水中原位溶解的无机碳和碱度。

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摘要

Porewater inorganic carbon concentration and total alkalinity from deeply buried marine sediment reflect biological activity, mineral diagenesis, sedimentary processes and past bottom ocean water composition. Reliable interpretation of these data is often complicated and/or limited due to (i) major physical environment changes taking place during sediment core retrieval, and (ii) the resulting precipitation of calcium carbonate (CaCO3) in the course of sample collection, processing and storage. Here we describe a robust method for quantifying the in-situ porewater carbonate system chemistry in deepsea sediment cores. The method relies on the over-determination of the dissolved carbonate system by measuring three of its parameters, and explicitly assumes CaCO3 saturation in the sediment and equilibrium conditions in-situ. The principles of the method are presented.;We experimentally test the proposed approach using concentration profiles of dissolved carbonate system components collected from the Integrated Ocean Drilling Program (IODP) Site U1368 in the Southern Pacific. Our results show that this method can be used to accurately reproduce the in-situ aqueous carbonate system chemistry if dissolved inorganic carbon, total alkalinity and calcium concentration are measured simultaneously. The method is well suited for use over a broad range of porewater chemistry and applicable for sediment over ca. 50% of the seafloor.
机译:深埋海底沉积物的孔隙水无机碳浓度和总碱度反映了生物活性,矿物成岩作用,沉积过程和过去的底部海水成分。这些数据的可靠解释通常是复杂的和/或受限制的,原因是:(i)沉积物岩心取回过程中发生了重大的物理环境变化;(ii)由此产生的碳酸钙(CaCO 3 )沉淀样品收集,处理和存储的过程。在这里,我们描述了一种可靠的方法,用于量化深海沉积物岩心中原位孔隙水碳酸盐系统的化学性质。该方法依赖于通过测量溶解碳酸盐系统的三个参数来进行超量测定,并明确假设沉积物中的CaCO 3 饱和度和原位平衡条件。提出了该方法的原理。我们使用从南太平洋综合海洋钻探计划(IODP)站点U1368收集的溶解碳酸盐体系组分的浓度曲线,对所提出的方法进行了实验测试。我们的结果表明,如果同时测量溶解的无机碳,总碱度和钙浓度,则该方法可用于准确重现原位碳酸盐体系的化学反应。该方法非常适合在广泛的孔隙水化学中使用,并适用于约20分钟以上的沉积物。 50%的海底。

著录项

  • 作者

    Sauvage, Justine.;

  • 作者单位

    University of Rhode Island.;

  • 授予单位 University of Rhode Island.;
  • 学科 Geology.;Biogeochemistry.;Chemical Oceanography.
  • 学位 M.S.
  • 年度 2013
  • 页码 71 p.
  • 总页数 71
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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