西准噶尔托里地区卡拉岗组火山岩地球化学特征及其构造意义Geochemical Character and Tectonic Significance of the Kalagang Formation Volcanic Rocks in Tuoli Area,West Jungger
高翔;魏俊浩;付乐兵;王谋;张霖;岳鹏;
摘要(Abstract):
对西准噶尔托里地区卡拉岗组火山岩进行了系统的岩相学、锆石U-Pb年代学及岩石地球化学研究。卡拉岗组火山岩从底部到顶部依次发育6个岩性段,其中中下部第4岩性段英安岩的LA-ICP-MS锆石U-Pb年龄为(298±3)Ma,为晚石炭世-早二叠世产物。火山岩整体上为准铝质-过铝质高钾钙碱性岩石,富集大离子亲石元素和轻稀土元素,相对亏损高场强元素和重稀土元素。火山岩及周围同时代A型花岗岩的年龄、主微量元素、Sr-Nd及锆石Hf同位素综合对比表明,卡拉岗组火山岩主要源于新生地壳的部分熔融。火山岩相关构造判别图解及区域构造-岩浆演化综合研究显示,卡拉岗组火山岩与区域上A型花岗岩均形成于后碰撞伸展环境。卡拉岗组火山岩的形成表明,西准噶尔晚古生代增生造山作用应早于晚石炭世。
关键词(KeyWords): 西准噶尔;卡拉岗组;火山岩;地球化学;构造背景
基金项目(Foundation): 中国地质大学(武汉)中央高校基本科研业务费专项资金项目(CUG120702;CUG120842);; 中国博士后科学基金项目(2012M52143)
作者(Author): 高翔;魏俊浩;付乐兵;王谋;张霖;岳鹏;
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