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Pore-water and sediment geochemistry in the Marmara Sea (Turkey): early diagenesis and diffusive fluxes

机译:马尔马拉海(土耳其)的孔隙水和沉积物地球化学:早期成岩作用和扩散通量

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摘要

Pore waters and sediments were analysed in two gravity cores from the Çinarcik Basin and the southern shelf of the Marmara Sea. The sediments are organic-rich (1.1 and 1.3 wt% Corg) and have been deposited at rates of 1.9 and 0.45 m/ka, respectively. The oxic+suboxic zone is 0.50–0.80 m thick and the sulphate–methane interface (SMI; defined here as the depth at which pore-water sulphates diminish below 1 mM) is 3.4 and 2.4 metres below sea floor (mbsf) in the southern shelf and Çinarcik Basin cores, respectively. Changes in the phosphate and ammonium gradients suggest that the sulphate reduction occurs by simple microbial organic matter degradation. Steep sulphate gradients at both sites may suggest that a part of the sulphate reduction may occur by anaerobic methane oxidation.
机译:在Çinarcik盆地和 马尔马拉海南部陆架的两个重力心 中分析了孔隙水和沉积物。沉积物富含有机物(1.1和1.3 wt% C org ),沉积速率为1.9和0.45 m / ka, 分别。含氧带和硫酸盐带的厚度为0.50–0.80 m ,硫酸盐-甲烷界面(SMI;此处定义为 )是孔隙水硫酸盐减少到1 mM)分别位于南部 陆架和Çinarcik盆地核心的海床(mbsf)下方3.4米和2.4米处。磷酸盐和铵盐梯度的变化 表明硫酸盐 的还原是通过简单的微生物有机物降解而实现的。 两个位置的硫酸盐陡峭梯度可能表明硫酸盐还原的一部分 可能是由厌氧甲烷氧化引起的。

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