Redox Environment and Its Significance for Phosphorus Formation of Ediacaran Doushantuo Formation in Zhangcunping Area, Yichang, Hubei Province: Constraints From Trace Elements
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摘要: 通过分析湖北宜昌樟村坪万家沟剖面埃迪卡拉系陡山沱组二段岩石样品的主量、微量元素，对该区域埃迪卡拉纪海洋的氧化还原状态进行了制约。氧化还原敏感元素的富集系数以及U/Th比值存在着明显的演化趋势，这些趋势显示陡山沱组二段沉积时期海水至少经历了3次含氧量明显减少的过程，并与磷含量显著增加相对应，分别沉积磷质条带、磷块岩和硅质结核白云岩。樟村坪地区下磷矿层沉积于水体由氧化快速转变为缺氧的环境之中。本文研究表明水体的氧化还原状态是影响埃迪卡拉纪成磷的关键因素之一。Abstract: The major and trace elements of the samples from the second member of Ediacaran Doushantuo Formation from the Wanjiagou section in the Zhangcunping area of western Hubei (South China) have been analyzed, so to constrain redox conditions of the Ediacaran ocean. The enrichment factor of redox-sensitive elements and U/Th ratio values show an obvious evolutionary trend, indicating that the seawater has experienced at least three obvious oxygen reduction processes during the sedimentary stage of the second member of Doushantuo Formation, and corresponding to the significant increase of phosphorus content, which leads to the deposited phosphorus bands, the phosphorite and the siliceous nodular dolostone respectively. The Lower Phosphorite Layer in the Zhangcunping area was deposited in the environment of rapid change from oxidation to reduction. This study shows that the redox state of seawater is one of the key factors influencing the Ediacaran phosphate-forming event.
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Key words:
- trace element /
- redox /
- Ediacaran /
- Doushantuo Formation /
- phosphorite /
- Yichang /
- Zhangcunping
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