碳酸盐岩酸不溶物作为贵州岩溶区红色风化壳主要物质来源的证据
Insoluble residues of carbonate rocks as source material for red weathering crusts in karst regions of Guizhou province, China
查看参考文献32篇
文摘
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贵州岩溶区红色风化壳是中国南方红色风化壳的重要组成部分,本文根据部分红色风化壳剖面野外特征、矿物学、地球化学及土壤物理学等的研究结果,对其物源及成因进行了探讨。各剖面,尤其邻近剖面显著的矿物学、地球化学差异排除了远程风成沉积物、火山灰、上覆或者高处碎屑岩层作为统一且重要物源的可能。极低的石英含量表明贵州常见的长石石英砂岩不是其主要物源,具有中稀土(MREE)富集特征也排除了粘圭岩、页岩作为主要物源的可能。风化壳剖面间的差异性均可从基岩酸不溶物的差异性得到很好解释,表明它们是下伏碳酸盐岩风化、酸不溶物(准)原地堆积的结果。部分剖面甚至显示了典型风化壳剖面的一些特征,具有正常风化序列的剖面结构特征。 |
其他语种文摘
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Red weathering crusts in the karst regions of Guizhou Province are an important part of weathering crusts in South China. But, up to now, the source material and formation mechanism of red weathering crusts cannot be understood clearly. Their source material was first systematically discussed on the basis of field investigations, and mineralogical, geochemical and soil physical studies. The significant difference in mineralogical and geochemical features for different weathering profiles can exclude that dust and/or volcanic ash are the main source materials of soils overlying carbonate rocks. Very low contents of quartz in some weathering profiles suggest that feldspar-quartz sandstones are not the main source because sandstones contain much quartz. In addition to sandstones, clay rocks and shales are two kinds of common clastic rocks in the investigated areas, so they are considered as an the important potential source of soil overlying carbonate rocks. However, some weathering profiles are characterized by enrichment in middle REE compared to shales, indicating that the are not the result of weathering from clay rocks and/or shales. The differences existing in different profiles can be explained by the differences in insoluble residues of their parent rocks, so insoluble residues were considered as the main source material for red weathering crusts overlying carbonate rocks in Guizhou Province. |
来源
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矿物学报
,2002,22(3):235-242 【核心库】
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关键词
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碳酸盐岩
;
红色风化壳
;
物质来源
;
贵州
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地址
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1.
中科院贵阳地球化学所, 环境地球化学国家重点实验室, 贵州, 贵阳, 550002
2.
贵州师范大学资源与环境科学系, 贵州, 贵阳, 550001
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1000-4734 |
学科
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地质学 |
基金
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中国科学院西部之光人才培养计划
;
中国科学院知识创新工程项目
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文献收藏号
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CSCD:946782
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