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碳酸盐岩风化壳岩-土界面地球化学特征及其形成过程--以贵州花溪灰岩风化壳剖面为例
引用本文:孙承兴,王世杰,刘秀明,冯志刚.碳酸盐岩风化壳岩-土界面地球化学特征及其形成过程--以贵州花溪灰岩风化壳剖面为例[J].矿物学报,2002,22(2):126-132.
作者姓名:孙承兴  王世杰  刘秀明  冯志刚
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,贵州,贵阳,550002;中国科学院,研究生院,北京,100039
2. 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,贵州,贵阳,550002
基金项目:国家自然科学基金 (批准号 4 98330 0 2 ),中国科学院知识创新工程项目 (KZCX2 -10 5),中国科学院“西部之光”资助项目
摘    要:在对黔中花溪灰岩风化壳原地风化残积特征进行了论证的基础上,本文从地球化学角度对央酸盐岩风化壳岩-土界面发育特征及其形成机理进行了讨论。碳酸盐岩的易溶解性和显著的差异性溶蚀,导致了其风化壳基岩面起伏强烈、岩-土界面界线清楚且突变;与此宏观特征相对应的是风化产物的矿物成分、主量、微量元素等方面均存在明显的突变现象。同时,在岩-土界面土层中形成了一个相对狭窄而突变的碱性障,此障无疑对风化壳的一些地质地球化学过程产生强烈影响,例如硅酸盐矿物的进一步蚀变分解,以及稀土和其它部分微量元素的超常富集和强烈分异等。

关 键 词:碳酸盐岩  风化壳  岩-土界面  地球化学  碱性障  贵州  形成机理
文章编号:1000-4734(2002)02-0126-07
修稿时间:2002年1月9日

GEOCHEMICAL CHARACTERISTICS AND FORMATION MECHANISM OF ROCK-SOIL INTERFACE IN LIMESTONE WEATHERING CRUST AT HUAXI, GUIZHOU PROVINCE
Sun Chengxing , Wang Shijie Liu Xiuming , Feng Zhigang.GEOCHEMICAL CHARACTERISTICS AND FORMATION MECHANISM OF ROCK-SOIL INTERFACE IN LIMESTONE WEATHERING CRUST AT HUAXI, GUIZHOU PROVINCE[J].Acta Mineralogica Sinica,2002,22(2):126-132.
Authors:Sun Chengxing  Wang Shijie Liu Xiuming  Feng Zhigang
Institution:Sun Chengxing 1,2 Wang Shijie 1 Liu Xiuming 1,2 Feng Zhigang 1,2
Abstract:On the basis of field observation, mineral and geochemical investigation, the jeltozem profile at Huaxi, Guizhou Province, was considered as an in situ weathering crust derived from Triassic limestones. In virtue of low content of insoluble residues and easy dissolution of carbonate rocks, there are lots of unusual geological characteristics during the weathering and soil formation processes of carbonate rocks, such as remarkable volume decrease, uneven base rock surface, clear and sharp rock soil interface, and so on. Several unusual geochemical characteristics at or near the rock soil interface were discussed in this paper. A sharp change in pH value can be found in the soil layer near the interface because of the presence of calcite and its quick dissolution. Superhigh enrichment and strong fractionation of REE occurred near the interface because of the alkaline barrier. In addition, sharp changes in mineral composition and major elements can be found, too.
Keywords:carbonate rock  weathering crust  rock  soil interface  geochemistry  alkaline barrier  Guizhou Province
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