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地质论评  2007 

新疆富蕴县苏普特一带双峰式火山岩的发现及其地质意义

Keywords: 双峰式火山岩俯冲撕裂型裂谷苏普特新疆阿尔泰

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Abstract:

新疆阿尔泰苏普特一带中泥盆统阿勒泰组为一套以玄武质岩石为主的双峰式火山岩组合,下部以变质玄武岩为主,夹少量流纹岩,中部以变质玄武岩、玄武质凝灰岩、沉凝灰岩为主,夹少量酸性火山岩及其碎屑岩,上部流纹质岩石有所增加。玄武质岩石往往变质为角闪片岩、绿帘阳起石片岩等,属拉斑玄武岩系列,低SiO2、K2O,高Ti,富Na、Rb、Ba、Th、U等,轻稀土略富集,无明显铕异常,Nb负异常明显,相似于MORB和岛弧型玄武岩的某些特征,与弧后盆地玄武岩的特征基本一致。流纹质岩石属钙碱性系列,高SiO2,低K2O,为钠质型;大离子亲石元素富集,具明显的Nb、P、Ti负异常和弱的Th正异常,Sr含量较低;稀土元素含量较高,∑REE为135.67×10-6~407.71×10-6,轻稀土略富集,(La/Yb)N为2.55~3.73,铕负异常较明显,δEu值为0.34~0.54。流纹质岩石地球化学特征也与典型弧后盆地双峰式火山岩中的流纹岩相似。结合区域资料分析,苏普特双峰式火山岩是阿尔泰南缘俯冲撕裂型裂谷盆地演化晚期局部形成的类似于弧后环境的产物。

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