贵州瓮安陡山沱组磷块岩稀土元素地球化学特征与沉积期后变化

解启来; 陈多福; 漆亮; 陈先沛

贵州瓮安陡山沱组磷块岩稀土元素地球化学特征与沉积期后变化

1.
石油大学盆地与油藏研究中心北京 102249;
2.
中国科学院广州地球化学研究所广州 510640;
3.
中国科学院地球化学研究所贵阳 550002

基金项目: 国家重点基金(批准号:49833002)、国家自然科学基金(批准号:40273032)及中国科学院广州地球化学研究所知识创新项目(GIGCX-03-04)资助

详细信息

作者简介:
解启来男 1964年出生副研究员博士盆地热史地球化学沉积学

中图分类号: P595

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REEs Geochemistry of Doushantuo Phosphorites and Modification during Post Sedimentary Stages in Weng'an Area, South China

1.
Basin & Reservoir Research Center, University of Petroleum, Beijing 102249;
2.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640;
3.
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002

摘要

摘要: 贵州瓮安陡山沱组磷块岩保存了可能是全球最早的后生动物化石 (瓮安动物群 ),对于瓮安动物群出现过程中的古海洋环境重建具有重要科学意义。但必须对成岩后生作用对磷块岩中的稀土元素改造进行评估。通过对贵州瓮安陡山沱组磷块岩的磷质碎屑、磷质和白云质胶结物、磷条带和泥条带等的稀土元素地球化学特征研究,确定沉积期后变化对稀土元素的改造影响不大。上矿层磷块岩沉积期形成的磷质碎屑、成岩期形成的白云质和磷质胶结物具相同的稀土元素配分模式,暗示了沉积期后的改造作用对瓮安陡山沱组磷块岩保存的原生沉积信息影响不大。瓮安陡山沱组磷块岩具有显著的重稀土亏损特征。磷块岩的磷质和白云质胶结物、伴生磷质碎屑、强风化磷块岩相近的ErN/LuN 比值,表明沉积期后的改造作用不是重稀土元素亏损的主要原因。磷块岩的ErN/LuN、LaN/NdN 与Ce/Ce 间的相关性,表明越氧化的沉积环境中,轻和重稀土元素亏损越强。
- 稀土元素 /
- 沉积期后改造 /
- 陡山沱组磷块岩 /
- 元古代末期 /
- 贵州瓮安
Abstract: The Neoproterozoic Doushantou phodphorites in Weng' an, South China, preserved a unique assemblage of a most likely the earliest metazoan in the world.The reconst ruction of paleoenvironmental change, when the Weng' an metazoan fauna emerged, is most important.But REE diagenetic modification of the Doushantou phosphorites must be evaluated.This paper is to discuss the REE modification in the Weng' an phosphorites during post sedimentary stages by REE geochemistry of phosphatic and dolomitic cements, phosphatic clasts in the upper phosphorites, phosphorite and shale bands in the lower phosphorites. The later diagenetic mineral phases:dolomitic and phosphatic cements display similar North American Shale normalized REE patterns with associated authigenic phosphatic phases and suggest that the REE geochemical characteristics in the Doushantuo phosphorites could be taken as primary signatures of paleoseawater conditions and may imply that the REE in the authigenic phosphatic phases were not modified during their burial, digenesis and surface weathering.The different REE characteristics in the phosphatic bands and associated shale bands in couplet samples suggested that the REE digenetic reaction might be only taken place within -strata but not between strata.Negative correlation of ErN/LuN and positive correlation of LaN/NdN with Ce/Ce^*suggests that the HREE and LREE depletions may derive from the change of paleoseawater redox condition, and HREE, LREE appear to be more depletion in the more oxidizing condition caused more Ce depletion.
- rare earth elements /
- modification in post sedimentary stages /
- Doushantuo phosphorites /
- terminal Proterozic /
- Weng' an

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参考文献(38)

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贵州瓮安陡山沱组磷块岩稀土元素地球化学特征与沉积期后变化

作者简介:
解启来男 1964年出生副研究员博士盆地热史地球化学沉积学

计量

REEs Geochemistry of Doushantuo Phosphorites and Modification during Post Sedimentary Stages in Weng'an Area, South China

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目录

贵州瓮安陡山沱组磷块岩稀土元素地球化学特征与沉积期后变化

1. 石油大学盆地与油藏研究中心北京 102249;

2. 中国科学院广州地球化学研究所广州 510640;

3. 中国科学院地球化学研究所贵阳 550002

作者简介:
解启来男 1964年出生副研究员博士盆地热史地球化学沉积学

English Abstract

REEs Geochemistry of Doushantuo Phosphorites and Modification during Post Sedimentary Stages in Weng'an Area, South China

1. Basin & Reservoir Research Center, University of Petroleum, Beijing 102249;

2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640;

3. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002

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[2]	李忠. “从最高到最深”—从第17届国际沉积学大会看沉积学研究前沿 . 沉积学报, 2006, 24(06): 928-933.

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贵州瓮安陡山沱组磷块岩稀土元素地球化学特征与沉积期后变化

作者简介: 解启来 男 1964年出生 副研究员 博士 盆地热史 地球化学 沉积学

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REEs Geochemistry of Doushantuo Phosphorites and Modification during Post Sedimentary Stages in Weng'an Area, South China

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出版历程

目录

贵州瓮安陡山沱组磷块岩稀土元素地球化学特征与沉积期后变化

1. 石油大学盆地与油藏研究中心 北京 102249; 2. 中国科学院广州地球化学研究所 广州 510640; 3. 中国科学院地球化学研究所 贵阳 550002

作者简介: 解启来 男 1964年出生 副研究员 博士 盆地热史 地球化学 沉积学

English Abstract

REEs Geochemistry of Doushantuo Phosphorites and Modification during Post Sedimentary Stages in Weng'an Area, South China

1. Basin & Reservoir Research Center, University of Petroleum, Beijing 102249; 2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640; 3. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002

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目录

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联系我们

作者简介:
解启来男 1964年出生副研究员博士盆地热史地球化学沉积学

1. 石油大学盆地与油藏研究中心北京 102249;

2. 中国科学院广州地球化学研究所广州 510640;

3. 中国科学院地球化学研究所贵阳 550002

作者简介:
解启来男 1964年出生副研究员博士盆地热史地球化学沉积学

1. Basin & Reservoir Research Center, University of Petroleum, Beijing 102249;

2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640;

3. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002