| 岩性不均一的灰岩风化壳发育特征——贵阳花溪剖面粒度分布特征的指示 |
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| 引用本文： | 冯志刚,王世杰,孙承兴,刘秀明.岩性不均一的灰岩风化壳发育特征——贵阳花溪剖面粒度分布特征的指示[J].中国岩溶,2003,22(3):197-202. |
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| 作者姓名： | 冯志刚 王世杰 孙承兴 刘秀明 |
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| 作者单位： | 1.中国科学院地球化学研究所环境地球化学国家重点实验室 2.中国科学院研究生院 |
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| 基金项目： | 国家自然科学基金重点项目(批准号:49833002),中国科学院"西部之光"项目 |
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| 摘 要： | 通过贵阳花溪夹泥质薄层的灰岩风化壳剖面的粒度分布特征的研究,结合矿物成分分析,揭示出岩性不均一的灰岩风化壳的发育特征: 灰岩作为剖面主体的成土母岩,风化早期,其以碳酸盐矿物的大量溶蚀及酸不溶物的残余积累为特征,同时方解石的溶解也延缓了酸不溶物的风化; 后期,随着易溶盐类消失殆尽,酸不溶物作为风化主体,开始了类似其它岩类的风化过程。而灰岩中的泥质薄层夹层,作为风化壳的次要组分,在灰岩风化过程中,由于存在巨大的体积缩小变化,泥质薄层被错断并被灰岩的风化产物所包裹,延缓了其风化发育进程。于是,各端元组分由于所处的微环境的差异,受风化溶液的影响程度不同,按照各自的风化方向和演化方式进行。随着风化程度不断增强,泥质薄片的包裹体分解,端元组分逐渐混合、趋同,风化壳趋于均质化,以统一的风化成土作用向表生稳定的矿物转变。
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| 关 键 词： | 岩性不均一 灰岩风化壳 粒度分布特征 花溪剖面 贵阳 |
| 文章编号： | 1001-4810(2003)03-0197-06 |
| 修稿时间： | 2003年5月24日 |
THE EVOLUTION FEATURE OF WEATHERED CRUST DEVELOPED BY INHOMOGENEOUS LIMESTONE BEDROCK AT HUAXI PROFILE IN GUIYANG CITY: IMPLICATION FROM GRAIN-SIZE DISTRIBUTION |
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| FENG Zhi-gang,WANG Shi-jie,SUN Cheng-xing and LIU Xiu-ming.THE EVOLUTION FEATURE OF WEATHERED CRUST DEVELOPED BY INHOMOGENEOUS LIMESTONE BEDROCK AT HUAXI PROFILE IN GUIYANG CITY: IMPLICATION FROM GRAIN-SIZE DISTRIBUTION[J].Carsologica Sinica,2003,22(3):197-202. |
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| Authors: | FENG Zhi-gang WANG Shi-jie SUN Cheng-xing and LIU Xiu-ming |
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| Institution: | 1.The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry,CAS 2.The Graduate School,CAS |
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| Abstract: | Research on the development characteristics of weathered crust is generally based on uni- member weathered parent rock. But few researchers have discussed the evolution feature of weathered profile developed by inhomogeneous bedrock, especially, on carbonate rock intercalated with clastic rocks. Through researching grain size distribution characteristics of weathered profile of limestone intercalated with argillous sheet in Huaxi, Guiyang City, and integrating with its mineral components, the development characteristics of weathered crust of inhomogeneous limestone are showed as follows:Limestone, as main weathered parent rock at early stage, is characterized of intense solution of carbonate materials and remains of acidic insoluble matter. Meanwhile, solution of calcite also retards weathering process of acidic insoluble matter. At late stage, with the absence of soluble minerals within weathered crust, acidic insoluble matter acts as main weathering matter, and develops weathered crust similar to other kinds of rocks. Argillous sheets, interlayers in limestone, as accessory ingredient of the weathered crust, are dislocated and enveloped by weathered residuals of limestone owing to huge volume shrinkage during weathering process of the parent limestone and this postpones weathering of argillous sheets. So, on account of its being situated in different microenvironment and its discrepant influenced level by weathering solution, every end- member is weathered and evolves in their own way. With gradual intensity of weathering degree, enveloping matter of argillous sheets is decomposed, end- members are gradually mixed, tend to convergence, weathered crust tends to become homogeneity and transform to supergene stable minerals in manner of uniform weathering action. |
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| Keywords: | Inhomogeneous bedrock Limestone weathered crust Grain size distribution characteristics Huaxi profile Guiyang |
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