王疆丽;林方成;彭正;施美凤;王宏;

• 1:四川省地质矿产勘查开发局四〇三地质队
• 2:成都地质矿产研究所
• 3:西南交通大学研究生院

摘要(Abstract)：

Phia Bioc花岗岩体位于老挝-越南长山褶皱带北西部马江缝合带与哀牢山-斯雷博河缝合带之间,镜下显微鉴定岩石类型为似斑状角闪黑云二长花岗岩。锆石阴极发光图上具有典型的震荡环带,锆石的稀土元素配分模式表现为轻稀土元素亏损,重稀土元素富集的左倾曲线,具有强烈正Ce异常和中等负Eu异常,其Th/U比值均大于0.1,表明所测锆石为典型的壳源岩浆锆石。锆石LA-ICP-MS U-Pb同位素分析结果显示,Phia Bioc岩体的年龄为(244.4±1.2)Ma,属于中三叠世安尼期岩浆活动的产物。对长山褶皱带印支期的区域地质背景、岩浆活动以及思茅-彭世洛陆块-东印支陆块-越北-华南陆块间的构造演化关系的综合分析表明,Phia Bioc花岗岩体是印支早期东印支陆块与越北-华南陆块沿马江缝合带同碰撞造山期挤压剪切环境的产物。

关键词(KeyWords)： 长山褶皱带;花岗岩;LA-ICP-MS锆石U-Pb定年;印支期;老挝-越南

Abstract:

Keywords:

基金项目(Foundation): 国土资源大调查项目“老挝-越南长山成矿带成矿规律及勘察选区研究”(1212011120337);; 国外矿产资源风险勘查专项资金项目“东南亚地区重要成矿带成矿规律与优势矿产资源潜力评价研究”([2011]D3-03)

作者(Author): 王疆丽;林方成;彭正;施美凤;王宏;

Email:

DOI:

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