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地质论评  2012 

阿尔泰南缘冲乎尔盆地康布铁堡组变质酸性火山岩年龄及岩石成因

Keywords: 变质酸性火山岩,地球化学,LAICPMS锆石UPb定年,新疆阿尔泰南缘

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Abstract:

冲乎尔盆地是阿尔泰南缘等间斜列的火山沉积盆地之一,盆地内出露有重要的康布铁堡组赋矿地层。本文对该组一个凝灰岩和两个变质流纹岩样品进行了LAICPMS锆石UPb年龄测定,获得了385?3±1?2Ma、398?1±1?8Ma和405?6±2?2Ma的结果。变质流纹岩的岩石地球化学分析结果表明,与克朗和麦兹盆地内的酸性火山岩的特征相同,即变质流纹岩属钙碱性低Ti流纹岩;在原始地幔标准化图上显示出Ti、P、Sr、Ba明显负异常,Th、U、Pb的正异常,LREE相对HREE略富集的特征,并显示强的Eu负异常(δEu=0?25~0?54)。结合其区域地质特征,认为本区变质酸性火山岩形成于活动大陆边缘环境,是下地壳发生了部分熔融后演化的产物。阿尔泰南缘的火山沉积盆地是早―中泥盆世时期在挤压环境中形成的断陷盆地。

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