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1南海北部陆坡天然气水合物的沉积物孔隙水地球化学研究进展显示文摘孔隙水地球化学异常是天然气水合物勘探的重要工具之一,南海北部陆坡地区拥有良好的天然气水合物成藏潜力,孔隙水地球化学异常在南海的天然气水合物勘探中发挥了重要作用。其中与水合物直接相关的氯离子含量异常被用于识别神狐及东沙海域钻探区的水合物层和计算水合物饱和度。除直接指标外,浅表层沉积物中的硫酸盐含量及其他与早期成岩作用有关的地球化学异常作为间接指标可用于水合物的找矿预测,研究者们通过对硫酸盐还原过程的判别、硫酸盐甲烷接触界面的计算等方面对南海北部陆坡不同海域的沉积物甲烷通量进行了评估,预测出水合物可能的成藏区域。其他如碘含量、氧化还原敏感元素、氯同位素、地球化学模型等新的地球化学指标和计算机手段也被应用于南海北部陆坡区水合物成藏研究并取得了不错的成效。杨涛 叶鸿 赖亦君 2017海洋地质与第四纪地质2017,37,5:6
2Assessment of the Tessier and BCR sequential extraction procedures for elemental partitioning of Ca, Fe, Mn, Al,and Ti and their application to surface sediments from Chinese continental shelf显示文摘Surface sediments can integrate a wide variety of information of seawater in marginal seas, e.g., the Quaternary sedimentary shelf such as the East China Sea(ECS) and Yellow Sea(YS). The Tessier and BCR sequential extraction procedures(SEPs) have been widely applied for extraction of various geochemical phases from sediments. To choose a suitable SEP for phase extraction of sediments from the above Quaternary sedimentary shelf, efficiency and selectivity experiments were conducted on typical individual minerals and the applicability of each SEP was assessed for natural sediments(the natural sediment standard GSD-9 and three surface sediment samples). The geochemical represented elements(Ca, Fe, Mn, Al, and Ti) were measured using both SEPs. Both SEPs have good dissolution efficiency and selectivity for the targeted geochemical phases; the optimized extractant volume for each fraction was determined. The Tessier SEP is particularly recommended for the study of adsorption-desorption process. The application of the Tessier SEP to surface sediments can furnish valuable information, including the productivity conditions(via the reducible fraction Mn) and sedimentary environments(via the carbonate fraction Ca). These results confirm that the Tessier SEP is suitable for elemental fractionation in sediments from the Chinese continental shelf.LIU Yanli ZHANG Jing HE Huijun 2018Acta Oceanologica Sinica2018,37,5:2
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