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首页> 外文期刊>Estuarine Coastal and Shelf Science >Geochemical characterization of mangrove sediments of the Zuari estuarine system, West coast of India
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Geochemical characterization of mangrove sediments of the Zuari estuarine system, West coast of India

机译：印度西海岸Zuari河口系统的红树林沉积物的地球化学特征

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The grain size, clay mineralogy and geochemistry were studied in the sediment cores collected from the mangrove environments of the Zuari estuary to understand sources and factors affecting accumulation, mobility, bioavailability and toxicity of metals. Finer sediments, organic matter and metals were higher in the middle estuary and canal sediments while coarser sediments with fewer metal concentrations were seen in the lower estuary. Kaolinite, smectite, illite and traces of chlorite constituted the clay mineral assemblage and had a minor influence on metal distributions. In the study area, the hydrodynamic conditions changed from lower estuary towards the upstream regions owing to mixing of riverine and sea water that led to finer sediment deposition in the middle estuary. The variations in metal abundance were attributed to a difference in hydrodynamic conditions regulated by the tide, freshwater flow and geomorphology of the Zuari estuary. The results revealed that the estuary received material from natural weathering of rocks as well as from anthropogenic sources such as mining and industrial/domestic discharges. Enrichment factor and Geo-accumulation index showed that Fe, Mn and Cr were enriched in the mangrove sediments whereas fractionation of metals revealed that concentrations of bioavailable Mn pose a considerable risk to biota. Increased accumulation of Fe and Mn in the upper middle estuary and canal sediments, trap trace metals that may considerably affect sediment quality and dredging of these sediments can cause re-suspension and mobilize metals from loosely bound sedimentary forms to the water column. (c) 2015 Elsevier Ltd. All rights reserved.
机译：研究了从Zuari河口红树林环境收集的沉积物芯中的颗粒大小，粘土矿物学和地球化学，以了解影响金属累积，迁移率，生物利用度和毒性的来源和因素。在河口中部和运河沉积物中，较细的沉积物，有机质和金属含量较高，而在河口较低处，则观察到较粗的沉积物，金属含量较低。高岭石，蒙脱石，伊利石和微量的亚氯酸盐构成了粘土矿物组合，对金属分布的影响较小。在研究区内，由于河水和海水的混合，导致河口中部的沉积物细化，水动力条件从河口下部向上游变化。金属丰度的变化归因于Zuari河口的潮汐，淡水流量和地貌所调节的流体动力学条件的差异。结果表明，河口从岩石自然风化以及人为来源（例如采矿和工业/家庭排放）中获得了物质。富集因子和地质积累指数表明，红树林沉积物中富集了铁，锰和铬，而金属的分馏表明，可利用的锰的浓度对生物群构成了相当大的风险。铁和锰在中上河口和运河沉积物中的积累增加，捕获可能会严重影响沉积物质量的痕量金属，而这些沉积物的疏can会导致重新悬浮，并将金属从松散结合的沉积形式中迁移至水柱。 （c）2015 Elsevier Ltd.保留所有权利。

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