Regional variations in sediment geochemistry on a transect across the Mendeleev Ridge (Arctic Ocean)
Regional variations in sediment geochemistry on a transect across the Mendeleev Ridge (Arctic Ocean)
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门捷列夫海岭（北冰洋）横断面沉积物地球化学的区域变化
DOI：
10.1016/j.chemgeo.2014.01.011
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发表时间：
2014
期刊：
影响因子：
3.9
通讯作者：
Brumsack H.-J.
中科院分区：
文献类型：
--
作者：
Meinhardt A.-K;März C;Stein R;Brumsack H.-J.
在北极考察ARK-XXIII/3期间，在横跨门捷列夫海岭的一个断面上，对三个北极表层沉积物岩心（PS 72/408-4、PS 72/410-2和PS 72/422-4）进行了无机地球化学调查。深棕色层的地球化学特征是Mn/Al和Fe/Al比值升高和微量金属富集。痕量金属，如As，Co，Cu，Mo和Ni，似乎被吸附到Mn/Fe羟基氧化物表面上，由于从水柱清除。Mn，Co，Mo和Ni的类似富集模式表明，这些微量金属主要结合到Mn，而Fe，As和Cu的不同模式表明，这些微量金属最有可能主要结合到其他沉积物相，如Fe-羟基氧化物或粘土矿物。计算Mn和Fe过量的量揭示了层的深棕色，其到目前为止主要归因于单独的Mn羟基氧化物含量增加，也可能是由更高的Fe-羟基氧化物贡献引起的。在调查的表层沉积物中，富锰层似乎主要来源于水柱内形成的颗粒。这意味着，棕色层的组成可能是空间可变的，即使在短距离。不一定需要成岩叠加，这限制了北极盆地棕色层的大规模相关性。锰的富集可能与西伯利亚河流的排放和海岸侵蚀有关。与冰筏碎片有关的材料输入记录在Ca/Al，Mg/Al和TIC模式中，表明来自加拿大群岛的白云石的发生。该物质通过博福特环流输送，并沿沿着样带向西显示丰度降低。一个更玄武质的组成部分，大概来自东西伯利亚腹地，其特点是低Si/Al和K/Al记录。Cabio和Srxspatiti可以作为生物碳酸盐输入和冰期/间冰期变化的额外指标。
Inorganic geochemical investigations were performed on three Arctic surface sediment cores (PS72/408-4, PS72/410-2 and PS72/422-4) recovered during RVPolarsternexpedition ARK-XXIII/3 on a transect across the Mendeleev Ridge. Dark brown layers are geochemically characterized by elevated Mn/Al and Fe/Al ratios and trace metal enrichments. Trace metals, such as As, Co, Cu, Mo and Ni, seem to be adsorbed onto Mn/Fe oxyhydroxide surfaces due to scavenging from the water column. Similar enrichment patterns of Mn, Co, Mo and Ni suggest that these trace metals are predominantly bound to Mn, whereas different patterns for Fe, As and Cu reveal that these trace metals are most probably mainly bound to other sediment phases like Fe-oxyhydroxides or clay minerals. Calculating Mn and Fe excess amounts reveals that the dark brown color of the layers, which so far has predominantly been attributed to enhanced Mn oxyhydroxide contents alone, may as well result from a higher Fe-oxyhydroxide contribution. In the investigated surface sediments Mn-rich layers seem to originate primarily from particulates formed within the water column. This implies that the composition of brown layers may be spatially variable even at short distances. A diagenetic overprint is not necessarily required, putting constraints on the large-scale correlation of brown layers across Arctic Basins. The Mn enrichments are presumably related to both Siberian river discharge and coastal erosion. Material input related to ice rafted debris is documented in Ca/Al, Mg/Al and TIC patterns indicating the occurrence of dolomite from the Canadian Archipelago. This material is transported via the Beaufort Gyre and shows decreasing abundance towards the west along the transect. A more basaltic component, presumably originating from the East Siberian hinterland, is characterized by low Si/Al and K/Al records. Cabioand Srxspatterns may serve as additional indicators for biogenic carbonate input and glacial/interglacial changes.
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影响因子：
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通讯作者：
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影响因子：
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作者：
März C;Schnetger B;Brumsack H-J
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