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以2010年11月“长江口及东海海洋综合考察”的基金委公共航次期间采集的长江口外不同站位的水体悬浮体颗粒为对象,使用扫描电镜和能谱仪相结合的方法对其进行了系统观察和研究,发现了铁氧化物和铁硫化物两种自生矿物集合体.铁氧化物集合体由纤铁矿微晶构成,形态不规则;铁硫化物集合体由大小均一的胶黄铁矿微晶构成,呈莓球状.纤铁矿的形成与周围水体的物理化学条件相关,而胶黄铁矿的形成则与有机质包裹的局部微环境有关.水体中所形成的两类自生铁矿物沉降到海底后,会受到底质物理化学条件的制约.本研究表明陆架泥质沉积体中的一部分莓球状铁硫化物属于水体沉积成因,当利用沉积物中黄铁矿莓球体进行环境分析时,需要充分考虑该部分自生铁硫化物的影响.
Taking the suspended particles of water bodies collected at different stations outside the Changjiang Estuary collected during the public voyage of the Fund Commission of the Yangtze River Estuary and the East China Sea Comprehensive Ocean Survey in November 2010 as targets, the combination of scanning electron microscopy and energy dispersive spectroscopy A systematic observation and research have been carried out to find that two kinds of self-generating mineral aggregates of iron oxide and iron sulfide are composed of fine iron minerals and irregular in shape. The iron sulfide aggregate consists of uniformly sized glue Pyrite microcrystal is raspberry spherical.The formation of lepidocrocite is related to the physicochemical conditions of surrounding water, while the formation of gel pyrite is related to the local microenvironment surrounded by organic matter.The two kinds of spontaneous formation After the iron ore subsides to the seafloor, it will be restricted by the physical and chemical conditions of the sediment.The present study shows that part of the raspberry-like iron sulfide in the shelf muddy sediments belongs to the sedimentary genesis of water bodies. When using the pyrite raspberry spheres in sediments Environmental analysis, you need to give full consideration to the part of the impact of self-generated iron sulfide.