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地球学报  2009 

黔南—桂北地区南华系化学地层特征

DOI: 10.3975/cagsb.2009.04.07

Keywords: 南华系,“寒冷气候期”,化学蚀变指数(CIA),钾交代:成分变异指数(ICV)

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Abstract:

化学蚀变指数(chemicalindexofalteration)(CIA)最早作为判别源岩化学风化程度而提出,随后又应用于对沉积物沉积环境的判定。化学蚀变指数的表达式为CIA={n(Al2O3)/[n(Al2O3)+n(CaO*)+n(Na2O)+n(K2O)]}?100。CaO*代表硅酸盐中的CaO,n(CaO*)=n(CaO)?n(CO2方解石)??n0.5?n(CO2白云石)??10/3?n(P2O5)。化学蚀变指数样品的选取极为重要,最佳岩性为细碎屑岩,并需清除成岩过程中钾交代作用的影响,以及采用成分变异指数(ICV)来判别沉积再循环作用和沉积物成分被改造的程度。使用A-CN-K三角图解判别物源区的源岩性质和样品钾交代的程度及其风化趋势。黔南—桂北地区南华系的CIA研究表明:该地区南华系下部的长安组其下部CIA值为60~65之间,中部为70~5,上部回落到65~70之间。南华系中部富禄组CIA值高,在85~95之间。南华系上部的南沱组CIA值再次回落到60—65的范围。上述CIA值的变化表明本区南华纪时期自老至新经历多次由干燥寒冷—温暖潮湿气候期的变化。本文据此提出扬子地块南华系新的划分、对比方案。

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