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首页> 外文期刊>Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences >Bottom water oxygenation history in southeastern Arabian Sea during the past 140 ka: Results from redox-sensitive elements
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Bottom water oxygenation history in southeastern Arabian Sea during the past 140 ka: Results from redox-sensitive elements

机译：过去140 ka期间阿拉伯海东南部的底部氧合历史：氧化还原敏感元素的结果

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摘要

The concentrations of multiple redox-sensitive elements such as Re, U, Mo, Cd, V, Sb, and Tl were determined in sediments from the southeastern Arabian Sea (9 degrees 21'N: 71 degrees 59'E) to understand the bottom water oxygenation history throughout the past 140 ka. The enrichment of redox-sensitive elements (Re, U, Cd and Sb) above average crustal abundances suggests that the Last Glacial Maxima (17.48 ka), stadials of Marine Isotope Stage (MIS)-5 (5b and 5d) and Glacial Termination (GT)-II (133 ka) were associated with suboxic bottom water conditions. Sediments deposited during these suboxic conditions show the highest Re content (up to 54 ppb normalized to a carbonate free basis) which is highly enriched over average continental crust (0.4 ppb) and these sediments appear to be the major sink for the global mass balance estimation. Marine Isotope Stages 1, 3, 4 and interstadials of MIS-5 (5a, 5c & 5e) were all associated with near-oxic conditions. Overall, the lack of enrichment of Mo and V above crustal abundance, and a high Re/Mo (ppm/ppm) ratio (avg. 18.2x 10(-3)) suggest that sediments of the southeastern Arabian Sea never contained free H2S during the last 140 ka. These changes in the bottom water oxygen content can be related to the oceanic circulation pattern during this time and in part are reflected in relationships between the timing of redox changes and paleoproductivity proxies.
机译：确定了来自阿拉伯海东南部（9度21'N：71度59'E）沉积物中的多种氧化还原敏感元素（例如Re，U，Mo，Cd，V，Sb和Tl）的浓度，以了解海底过去140 ka的水氧化历史。高于平均地壳丰度的氧化还原敏感元素（Re，U，Cd和Sb）的富集表明，末次冰期最大值（17.48 ka），海洋同位素阶段（MIS）-5（5b和5d）和冰期终止（ GT）-II（133 ka）与低氧的底部水条件有关。在这些低氧条件下沉积的沉积物显示出最高的Re含量（标准化至无碳酸盐基础上最高为54 ppb），在平均大陆壳（0.4 ppb）上高度富集，这些沉积物似乎是全球质量平衡估算的主要汇。 MIS-5（5a，5c和5e）的海洋同位素第1、3、4期和间质都与近氧条件有关。总体而言，缺乏高于地壳丰度的Mo和V富集，以及较高的Re / Mo（ppm / ppm）比（平均18.2x 10（-3））表明，阿拉伯阿拉伯东南部的沉积物在此期间从未含有游离的H2S。最后的140 ka。这段时间底水含氧量的这些变化可能与海洋环流模式有关，并且部分反映在氧化还原变化时间与古生产力代理之间的关系中。

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