峨眉山大火成岩省中两类岩浆分异趋势及其成因

被引：34

作者：

徐义刚

梅厚钧

许继峰

黄小龙

王岳军

钟孙霖

不详

机构：

[1] 中国科学院广州地球化学研究所

[2] 台湾大学地质系广州 :

[3] 广州 :

[4] 台北

来源：

科学通报 | 2003年 / 04期

关键词：

玄武岩; 岩浆分异; 地壳混染; 富铁岩浆; 峨眉山大火成岩省;

D O I：

暂无

中图分类号：

P588.1 [岩浆岩（火成岩）];

学科分类号：

070901 ;

摘要：

二叠纪峨眉山大火成岩省存在两种岩浆分异趋势,攀西古裂谷带内的岩浆显示Bowen分异趋势(即朝富Si贫Fe的流纹质岩浆演化),在时空上与含V-Ti-Fe矿床的基性-超基性岩体密切相关,峨眉山岩省东区的玄武岩则具有Fenner分异趋势(即朝富Fe贫Si方向演化),最终分异产物中Fe2O3含量高达23％,SiO2含量低至44％,这一成分岩浆的发现为富Fe贫Si岩浆在自然界的客观存在提供了直接的证据.具Bowen分异趋势的岩浆系列的氧逸度较高,并经历了较大程度的地壳混染作用,而具Fenner分异趋势的岩浆的氧逸度较低,地壳混染不明显.这暗示地壳混染程度可能是造成幔源岩浆具有不同分异趋势的重要原因,具不同分异趋势的岩浆的空间分布特征为西南地区V-Ti-Fe矿床的形成机制提供了新的制约.

引用

页码：383 / 387

页数：5

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