Balkis N, Cağatay M N
Institute of Marine Sciences and Management, University of Istanbul, Turkey.
Environ Int. 2001 Jul;27(1):1-13. doi: 10.1016/s0160-4120(01)00044-7.
A geochemical study of the Erdek Bay sediments in the Sea of Marmara, Turkey, was carried out to investigate the heavy metal distributions and sources. The bay has an average depth of 34 m and a two-layer water column stratification, with a pycnocline at 20 m. The distribution of "total" metal (Fe, Mn, Pb, Cu, Ni, Cr, Zn and Hg) concentrations, together with sequential selective extraction analyses, shows that the relatively high metal concentrations are mainly due to land-based natural inputs from the erosion products of mineralized zones and mafic-ultramafic rocks delivered to the bay by two rivers from the south. However, some Pb, Zn and Cu occur in the Fe-Mn-oxyhydroxide and organic fractions, suggesting, in part, some anthropogenic inputs in addition to the predominantly natural inputs. The vertical distribution of metal/A1 ratios in a gravity core in the bay shows no significant change with depth, except for an early diagenetic enrichment at 0.7-1.6 m below sea floor (mbsf) above a 4750-3500-year-old sapropelic layer. This distribution is a further indication of the insignificant antropogenic metal pollution in the bay.
对土耳其马尔马拉海埃尔德克湾的沉积物进行了地球化学研究，以调查重金属的分布和来源。该海湾平均深度为34米，水柱分层为两层，在20米深处有一个温跃层。“总”金属（铁、锰、铅、铜、镍、铬、锌和汞）浓度的分布以及连续选择性萃取分析表明，相对较高的金属浓度主要源于陆地自然输入，这些输入来自矿化带的侵蚀产物以及由南部两条河流输送到海湾的镁铁质-超镁铁质岩石。然而，一些铅、锌和铜存在于铁-锰-羟基氧化物和有机组分中，这表明除了主要的自然输入外，部分还有一些人为输入。海湾重力岩心中金属/铝比值的垂直分布随深度没有显著变化，除了在海底以下0.7 - 1.6米（mbsf）处，在一个4750 - 3500年前的腐泥层之上有早期成岩富集现象。这种分布进一步表明该海湾人为金属污染不显著。
