| 长江口外悬浮颗粒物中自生纤铁矿和胶黄铁矿 |
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| 引用本文： | 范德江,陈彬,王亮,孙晓霞,刘明,杨作升.长江口外悬浮颗粒物中自生纤铁矿和胶黄铁矿[J].地球科学,2014,39(10):1364-1370. |
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| 作者姓名： | 范德江 陈彬 王亮 孙晓霞 刘明 杨作升 |
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| 作者单位： | 中国海洋大学海底科学与探测技术教育部重点实验室，山东青岛 266100 |
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| 基金项目： | 国家自然科学基金项目(Nos.41376055,41030856);中国大洋协会十二五项目(No.DY125-11-R-04) |
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| 摘 要： | 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.
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| 关 键 词： | 长江口 悬浮体 自生矿物 纤铁矿 胶黄铁矿 沉积学 地球化学 |
| 收稿时间： | 2014-01-19 |
Authigenic Lepidocrocite and Greigite Particles inAquatic Environments off the Yangtze River Estuary |
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| Abstract: | A scanning electron micrometer with energy-dispersive X-ray analytical system is used to investigate the suspended particles collected in 2010 in aquatic environments off the Yangtze River estuary in this study. The results show that iron oxide and iron sulfide co-exist in the same environment. Iron oxide is lepidocrocite, which accumulates in porously irregular aggregates. Iron sulfide is greigite and aggregates into organized framboids. The greigite framboids are enclosed by organic films. Lepidocrocite is in agreement with the environmental conditions. Meanwhile, greigite only exists at a local patch covered with organic films. Both lepidocrocite and greigite particles settle down easily, but their preservation depends on the early diagenesis conditions. It is suggested that at least a minor part of the iron sulfide framboids commonly found in the sedimentary sequences perhaps originates from their upward aquatic environment. |
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