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首页> 外文期刊>Geochemical Journal >Rare-earth, major, and trace element geochemistry of deep-sea sediments in the Indian Ocean: Implications for the potential distribution of REY-rich mud in the Indian Ocean
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Rare-earth, major, and trace element geochemistry of deep-sea sediments in the Indian Ocean: Implications for the potential distribution of REY-rich mud in the Indian Ocean

机译：印度洋深海沉积物的稀土，主要和微量元素地球化学：对富含REY泥浆在印度洋中潜在分布的启示

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摘要

We analyzed 1338 deep-sea sediment samples from 19 Deep Sea Drilling Project/Ocean Drilling Program sites covering a large portion of the Indian Ocean, and constructed a new and comprehensive data set of their bulk chemical compositions, including rare-earth, major, and trace elements. The bulk-sediment rare-earth and yttrium (REY) composition of the REY-enriched samples, characterized by relatively small negative Ce anomalies, almost no Y anomalies, and enrichment in heavy rare-earth elements, can be interpreted as the superposition of the REY compositions of apatite and hydrogenous Fe-Mn oxides. Although the hydrothermal component is a key factor in the formation of REY-rich mud in the Pacific Ocean, it is less important in the Indian Ocean, probably because there is less hydrothermal input of Fe-oxyhydroxides from seafloor hydrothermal vents there. The relationships among Fe2O3, MnO, P2O5, Co, and total REY contents suggest that a primary factor controlling REY enrichment in deep-sea sediments is the sedimentation rate. A low sedimentation rate allows both fish debris apatite and hydrogenous Fe-Mn (oxyhydr)oxides to accumulate in the surface sediments. On the basis of these results, we identified two potential areas in the Indian Ocean where REY-rich mud may be present in surface sediments: the south-southeastern Wharton Basin and the southern Central Indian Ocean Basin. The resource potential of the latter area might be particularly high if the distributions of REY-rich mud and Fe-Mn nodule fields broadly overlap.
机译：我们分析了来自印度洋大部分地区的19个深海钻探项目/海洋钻探计划站点的1338个深海沉积物样本，并构建了有关其散装化学成分的新的综合数据集，包括稀土，主要和微量元素。富REY样品的大量沉积稀土和钇（REY）成分具有相对较小的负Ce异常，几乎没有Y异常以及富集重稀土元素的特征，可以解释为稀土元素的叠加。磷灰石和含氢铁锰氧化物的REY组成。尽管热液成分是太平洋中富含REY泥浆形成的关键因素，但在印度洋中则不那么重要，这可能是因为那里的海底热液喷口产生的Fe-羟基氢氧化物的热液输入较少。 Fe2O3，MnO，P2O5，Co和REY总量之间的关系表明，控制REY在深海沉积物中富集的主要因素是沉积速率。低的沉积速率使鱼类残骸磷灰石和含铁的Fe-Mn（羟基氧化物）氧化物都堆积在表层沉积物中。根据这些结果，我们在印度洋中确定了两个潜在的区域，在这些潜在区域中，地表沉积物中可能存在富含REY的泥浆：南部东南部的沃顿盆地和南部中部印度洋盆地。如果富含REY的泥浆和Fe-Mn结核的分布广泛重叠，那么后一地区的资源潜力可能特别高。

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