| 浅析北方红粘土对碳酸盐岩溶蚀作用的影响 |
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| 引用本文： | 田级生.浅析北方红粘土对碳酸盐岩溶蚀作用的影响[J].吉林大学学报(地球科学版),1986(3). |
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| 作者姓名： | 田级生 |
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| 作者单位： | 河北省地矿局 |
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| 摘 要： | 北方碳酸盐岩发育的红色风化壳大都是第Ⅰ、Ⅱ间冰期湿热气候条件下溶蚀与风化作用的结果,形成硅铝—铁型风化壳。风化壳中红粘土化学成分R_2O_3(Al_2O_3+Fe_2O_3)含量达20—30％。当降水或地表水的垂直下渗、红粘土的氢离子浓度加大,溶蚀性增强,沿红粘土和碳酸盐岩接触面产生溶蚀作用,形成石芽、溶沟、溶槽、溶痕等岩溶地形,并在它们的表面保留有红粘土痕迹。
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| 关 键 词： | 粘土 风化壳 风化作用 岩溶作用 |
PRILIMINARY STUDY ON THE EFFECT OF RED CLAY TO THE KARSTIFICATION OF CARBONATE ROCKS IN NORTH CHINA |
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| Tian Jisheng.PRILIMINARY STUDY ON THE EFFECT OF RED CLAY TO THE KARSTIFICATION OF CARBONATE ROCKS IN NORTH CHINA[J].Journal of Jilin Unviersity:Earth Science Edition,1986(3). |
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| Authors: | Tian Jisheng |
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| Institution: | Bureau of Geology and Mineral Resources of Hebei Province |
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| Abstract: | The reddish weathering crust developed in carbonate rocks in North China belongs to the Sial-Fe type, which was mostly produced through karstification under warm and humid climate conditions during the 1st and 2st interglacial stage in Quaternary period. Chemical component R2O3 (Al203 + Fe2O3) of the red clay of the weathering crust can reach 22.53 to 30.84%, among which the part of iron oxide influences the charcter of the erosion surface, while aluminium ions control the hydrogen ion concentration in red clay and so the way of karstification. Because the hydrogen ion concentration in red clay is depended upon the content of its exchangeable aluminium ions. When red clay contacts with water, free hydrogen ions in water phase exchange aluminium ions in solid phase equivalently, and the equivalent aluminium ions will be freed from the red clay. The more hydrogen ions exchange with the aluminium the higher the hydrogen ion concentration, the higher the acidity, and the stronger erosion of carbonate rocks; vice versa.The carbonate rock surface covered by red clay takes a variety of karst forms, such as karren, fissure, trough and so on, because karstification always takes place on the surface of carbonate rocks, where water could percolate freely. |
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| Keywords: | Clay Crust of weathering Weathering Karst process |
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