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首页> 外文期刊>Estuarine Coastal and Shelf Science >Mechanisms Of Land-sea Interactions - The Distribution Of Metals And Sedimentary Organic Matter In Sediments Of A River-dominated Mediterranean Karstic Estuary
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Mechanisms Of Land-sea Interactions - The Distribution Of Metals And Sedimentary Organic Matter In Sediments Of A River-dominated Mediterranean Karstic Estuary

机译：陆海相互作用的机理-河流主导的地中海岩溶河口沉积物中金属和沉积有机质的分布

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摘要

This paper examines disposal of metals and the origin, characteristics, and distribution of sedimentary organic matter (SOM) in a Mediterranean karstic estuary in the north-eastern Adriatic. This environment offers a real-time, small model system for studies of geochemical processes in microtidal Mediterranean estuaries that are infilling with sediments and classified as river-dominated disequilibrium estuaries. The results have shown that the longitudinal distribution of heavy metals in sediments follows the sedimentation dynamics and deposition pattern of river-borne, clay mineral particles. The highest concentration of metals was found in the restricted upper part of the estuary, characterized by rapid deposition of clay particles and terrestrial sedimentary organic matter, and decreases toward the open sea. The vertical distribution of metals in sediment cores depends on the prevailing pH and Eh conditions. Significant increases of the concentrations of metals in the uppermost strata are the result of recent anthropogenic inputs. The share of the terrestrial component in SOM, estimated by N/C_(org) atomic ratios and δ~(13)C values, decreases with distance from the river mouth. The small vertical variation in δ~(13)C values of SOM indicates that a fast sedimentation rate overrides the diagenetically determined decomposition. The results obtained indicate that river-borne inorganic particles, natural terrigenous organic material, and anthropogenic metal loads are trapped in sediments of the estuarine system. Under the prevailing conditions, there is negligible transport towards the open sea.
机译：本文研究了亚得里亚海东北部的一个地中海岩溶河口中的金属处置以及沉积有机物（SOM）的起源，特征和分布。这种环境提供了一个实时的小型模型系统，用于研究地中海微潮汐河口中的地球化学过程，这些河床中充满了沉积物，并被分类为以河流为主导的不平衡河口。结果表明，沉积物中重金属的纵向分布遵循河流传播的粘土矿物颗粒的沉积动力学和沉积方式。在河口受限制的上部发现金属的最高浓度，其特征是粘土颗粒和陆地沉积有机物的快速沉积，并向公海减少。沉积物核中金属的垂直分布取决于当前的pH和Eh条件。最近人为投入的结果是最上层地层金属浓度的显着增加。通过N / C_（org）原子比和δ〜（13）C值估算的SOM中地面成分的份额随着距河口距离的增加而减小。 SOM的δ〜（13）C值在垂直方向上的小变化表明，快速沉积速率优先于通过渗磁法确定的分解。获得的结果表明，河口无机颗粒，天然陆源有机物质和人为金属负荷被困在河口系统的沉积物中。在当前条件下，向公海的运输量微不足道。

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