| 埃迪卡拉纪全球成磷事件沉积地球化学模型探讨:以扬子板块不同相区陡山沱组含磷岩层研究为实例 |
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| 引用本文： | 纪秋梅,吕苗,张俊明,胡春林,朱茂炎.埃迪卡拉纪全球成磷事件沉积地球化学模型探讨:以扬子板块不同相区陡山沱组含磷岩层研究为实例[J].高校地质学报,2019,25(1):68. |
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| 作者姓名： | 纪秋梅 吕苗 张俊明 胡春林 朱茂炎 |
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| 作者单位： | 现代古生物学与地层学国家重点实验室,中国科学院南京地质古生物研究所,南京210008;中国科学院生物演化与环境卓越创新中心,南京210008;现代古生物学与地层学国家重点实验室,中国科学院南京地质古生物研究所,南京210008;现代古生物学与地层学国家重点实验室,中国科学院南京地质古生物研究所,南京210008;中国科学院生物演化与环境卓越创新中心,南京210008;中国科学院大学地球科学学院,北京100049 |
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| 基金项目： | 中国科学院战略性先导科技专项;国家自然科学基金 |
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| 摘 要： | 埃迪卡拉纪是地球第二次大规模成磷时期，全球各大陆均有这次成磷事件的记录。目前对于该时期成磷事件的形成
尚未有广泛接受的地球化学模型解释。而磷酸盐的沉积受海水氧化还原条件的控制，因此通过该时期磷块岩沉积与海水氧
化还原条件演变之间关系的研究可为全球大规模成磷事件的沉积地球化学模型建立提供验证。文章通过对扬子板块埃迪卡
拉纪不同相区磷块岩中碳酸盐组分稀土元素分析，结果表明磷块岩形成时底层海水处于次氧化-接近氧化的不稳定状态，
氧化还原界面沿浅海-大陆架呈现动态变化的特征，为磷块岩的大规模形成提供最佳沉积地球化学条件。合适的海水化学
条件及丰富的磷质来源，大大增加了磷块岩沉积的空间和机会，导致了地质历史时期第二次全球规模成磷发生。
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| 关 键 词： | 扬子板块 埃迪卡拉纪 磷块岩 稀土元素 氧化还原 |
Explore the Model of Sedimentary Geochemistry of the Ediacaran Phosphogenic Even: A Case Study of the Doushantuo Phosphorite from Different Facies of the Yangtze Platform |
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| JI Qiumei,LYU Miao,ZHANG Junming,HUChunlin,ZHU Maoyan.Explore the Model of Sedimentary Geochemistry of the Ediacaran Phosphogenic Even: A Case Study of the Doushantuo Phosphorite from Different Facies of the Yangtze Platform[J].Geological Journal of China Universities,2019,25(1):68. |
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| Authors: | JI Qiumei LYU Miao ZHANG Junming HUChunlin ZHU Maoyan |
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| Abstract: | Large accumulations of phosphorite in the Ediacaran worldwide witnessed the second phosphogenic event in the Earth
history. However, there is no generally acknowledged geochemical model for this event so far. Given that precipitation of phosphate is
controlled by seawater redox conditions, explore the cause-and-effect relationship between the phosphorite deposits and seawater
chemistry is critical to testify the model of sedimentary geochemistry. This can help to understand the large scale phosphorite deposits
worldwide across this transitional time interval. In this study, the REE+Y data of phosphorite-associated carbonates from different
facies demonstrate that the Doushantuo phosphorites were deposited in suboxic conditions with intermittent oxidization. The redox
condition of the Ediacaran seawater was unstable and the redox boundary dynamically fluctuated from shallow to deep water conditions.
This greatly increased the space and opportunity for the deposition of phosphorite, leading to the great phosphogenic event during the
Ediacaran-Cambrian transition. |
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| Keywords: | South China Ediacaran phosphorite REE redox |
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