This paper discusses the environmental and biogeochemical process of accumulation of iron-phosphorus in marine sediments for the north aktian of the South China Sea and analyzes the relationships between the contents ...This paper discusses the environmental and biogeochemical process of accumulation of iron-phosphorus in marine sediments for the north aktian of the South China Sea and analyzes the relationships between the contents of iron, phosphorus and calcium carbonate as well as their ex-istent characteristics. The results show that the variances of phosphorus and calcium carbonate contents with depths are opposite and those of iron and calcium carbonate contents are almost accordant. It is not only related to the biogeo-chemical process of accumulation of biogenous calcium car-bonate in sediments, which resulted from the fact that the marine primary productivity was stimulated by part of ter-rigenous phosphorus dissolved into seawater due to decline of superficial water temperature and increase of carbon di-oxide content in the glacial period, but also related to iron impelled oxidation and accelerated deposit by the dissolved oxygen from the atmosphere and the photosynthesis of hy-drophytes in seawater. The variance of soluble iron-phos- phorus species (Fe-P) in sediment columns can sensitively reflect the changes of climate and environment, which sug-gests that the accumulative characteristics and existent states of iron-phosphorus species (Fe-P) in marine sediments have the significance as an indicator of the changes of paleocli-mate and paleoenvironment.展开更多
文摘This paper discusses the environmental and biogeochemical process of accumulation of iron-phosphorus in marine sediments for the north aktian of the South China Sea and analyzes the relationships between the contents of iron, phosphorus and calcium carbonate as well as their ex-istent characteristics. The results show that the variances of phosphorus and calcium carbonate contents with depths are opposite and those of iron and calcium carbonate contents are almost accordant. It is not only related to the biogeo-chemical process of accumulation of biogenous calcium car-bonate in sediments, which resulted from the fact that the marine primary productivity was stimulated by part of ter-rigenous phosphorus dissolved into seawater due to decline of superficial water temperature and increase of carbon di-oxide content in the glacial period, but also related to iron impelled oxidation and accelerated deposit by the dissolved oxygen from the atmosphere and the photosynthesis of hy-drophytes in seawater. The variance of soluble iron-phos- phorus species (Fe-P) in sediment columns can sensitively reflect the changes of climate and environment, which sug-gests that the accumulative characteristics and existent states of iron-phosphorus species (Fe-P) in marine sediments have the significance as an indicator of the changes of paleocli-mate and paleoenvironment.
