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地质学报  2003 

攀西古裂谷内龙帚山玄武岩―碱玄响岩建造

, PP. 341-358

Keywords: 攀西古裂谷龙帚山玄武岩裂谷岩浆活动峨眉山玄武岩建造地幔热柱

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Abstract:

在川、滇、黔三省晚二叠世峨眉山玄武岩省的中部,产于攀西古裂谷内的龙帚山火山岩建造自下而上有4个喷发旋回:拉斑玄武岩、碱玄响岩、钾粗面玄武岩以及拉斑玄武岩。上下两个玄武岩旋回的岩性与该裂谷带以外大面积展布的高钛玄武岩岩性相同;而其碱玄响岩旋回主要由响碱玄岩―碱玄响岩―响岩岩系组成,夹粗安岩和安粗岩层,此旋回厚达千米,类似于非洲肯尼亚裂谷带的高原溢流响岩岩系。龙帚山晚二叠世火山岩建造的层序和岩石组合不同于古裂谷带外正常的大陆板内暗色岩喷出相的层序和岩浆演化规律,可能是地幔热柱和裂谷背景下岩石圈拉张复合作用的结果。

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