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地质论评  2004 

峨眉山大火成岩省“高钛玄武岩”和“低钛玄武岩”成因探讨

Keywords: 玄武岩峨眉山大火成岩省成因探讨分离结晶Pb同位素空间分带苦橄岩母岩连续变化含量

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Abstract:

大量的岩石化学资料分析表明,峨眉山大火成岩省玄武岩的TiO2含量是连续变化的,不存在明显的间断。野外地质特征表明高钛和低钛玄武岩既不存在空间分带,也不存在时间分带。其Sr、Nd和Pb同位素组成也没有明显的区别,推测它们可能是同源岩浆分离结晶的产物。根据MgO和TiO2的相关关系,可将苦橄岩和玄武岩的演化划分为4个趋势,并采用分离结晶模式对其进行了成因模拟,表明高钛和低钛玄武岩是同―母岩浆(苦橄―玄武岩浆)通过不同矿物相分离结晶的产物。

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