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首页> 外文期刊>地質調查所月報 >Geochemistry of bottom sediments from a river-estuary-shelf mixing zone on the tropical southwest coast of India
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Geochemistry of bottom sediments from a river-estuary-shelf mixing zone on the tropical southwest coast of India

机译：印度热带西南海岸河口-陆架混合带底部沉积物的地球化学

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摘要

Geochemical study of bottom sediments of the Periyar and Muvattupuzha rivers, Cochin estuary and the adjoining nearshore continental shelf was carried out to understand the distribution and enrichment pattern, sources, possible factors responsible for the enrichment and depletion of elements and environmental contamination o f the systems. The river sediments are sand to sandy silt, estuarine sediments are sandy silt to clay and inner shelf sediments are mud. The study indicate that the sediment texture is the major controlling factor in the distribution of elements here. The fine grained sediments of the inner shelf and estuary are rich in MgO, CaO, Al_2O_3, TiO_2, Fe_2O_3, Na_2O_3, P_2O_5, K_2O, MnO, Li, Sc, V, Cr, Co, Ni, Cu, Zn, As, Rb, Ta, Zr, Nb, Pb, LOI and poor in SiO_2. The organic rich sediments exhibit a similarity in the distribution of elements like Fe_2O_3, Al_2O_3, MgO, P_2O_5, Cu, Ni, Co, Cr and V. The other possible factors for the enrichment of certain elements are the presence of metal scavenging phases like Fe / Mn hydroxides and the higher content of heavy minerals in the area. The higher concentration of Fe_2O_3, MgO, P_2O_5, Zn, Ba, Pb, Cd, Bi and Cr in many samples indicates that all the sampling units are anthropologically contaminated, with the Periyar river and it's estuarine area showing maximum heavy metal contamination in the study area.
机译：进行了Periyar和Muvattupuzha河，科钦河口和毗连的近岸大陆架底部沉积物的地球化学研究，以了解分布和富集方式，来源，造成元素富集和消耗以及系统中环境污染的可能因素。河流的沉积物是沙子到沙质的淤泥，河口的沉积物是沙质的淤泥到黏土，内层的沉积物是泥土。研究表明，沉积物质地是影响元素分布的主要控制因素。内陆和河口的细颗粒沉积物富含MgO，CaO，Al_2O_3，TiO_2，Fe_2O_3，Na_2O_3，P_2O_5，K_2O，MnO，Li，Sc，V，Cr，Co，Ni，Cu，Zn，As，Rb ，Ta，Zr，Nb，Pb，LOI且SiO_2较差。富含有机物的沉积物在诸如Fe_2O_3，Al_2O_3，MgO，P_2O_5，Cu，Ni，Co，Cr和V等元素的分布中具有相似性。某些元素富集的其他可能因素是金属清除相的存在，例如Fe /氢氧化锰和该地区重矿物含量较高。在许多样品中，Fe_2O_3，MgO，P_2O_5，Zn，Ba，Pb，Cd，Bi和Cr的浓度较高，表明所有采样单元都受到了人类学污染，佩里亚尔河及其河口区域显示出最大的重金属污染区。

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