| 刘书生.老挝西北部沙耶武里地区闪长岩锆石U-Pb年代学与地球化学特征[J].地质与勘探,2018,54(6):1282-1291 |
| 老挝西北部沙耶武里地区闪长岩锆石U-Pb年代学与地球化学特征 |
| Zircon U-Pb geochronology and geochemical characteristics of the diorites in the Sayabouliarea, NW Laos |
| 投稿时间：2018-08-07 修订日期：2018-11-12 |
| DOI：10.12134/j.dzykt.2018.06.020 |
| 中文关键词: 闪长岩 地球化学特征 锆石U-Pb年龄 沙耶武里 老挝 |
| 英文关键词: diorite, geochemical characteristics, Zircon U-Pb age,Sayabouli in NW Laos, |
| 基金项目:中国地质调查局地质调查项目“老挝、柬埔寨及邻区矿产资源潜力评价”（编号：DD20160107）资助 |
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| 中文摘要: |
| 老挝沙耶武里地区发育一套二叠纪-三叠纪岩浆岩，主要岩性为玄武岩、安山岩、流纹岩和花岗岩、二长花岗岩、花岗闪长岩和闪长岩。本文报道了老挝西北部沙耶武里地区闪长岩样品LA-ICP-MS锆石U-Pb年龄为253.5±1.5Ma（MSWD=1.18），属早三叠世。该岩体明显富集K、Rb、Ba、Sr、Th、U等大离子亲石元素和轻稀土微量元素（LREE），Nb、Ta、Ni等高场强元素相对亏损，Nb/Ta、Th/Yb、（Th/Nb）N和Nb/La比值表明岩石成因具壳幔混合特征；结合区域地质构造演化过程综合分析得出该岩体形成的大地构造背景为古特提斯洋洋壳俯冲-岛弧环境。 |
| 英文摘要: |
| A set of Permian-Triassic basalts, rhyolite, granite, monzonitic granite, granodiorite, diorite assemblages outcropped in the Sayabouli area in NW Laos. This paper reports that the LA-ICP-MS zircon U-Pb age of 253.5±1.5Ma（MSWD=1.18） for the diorite sample from the Sayabouli area, which indicated the diorites formed in the EarlyTriassic. These diorites are enriched in LILE(such as K, Ba, RB), LREE and more mobile incompatible elements(such as Th, U), relatively depleting in HFSE(such as Nb、Ta、Ni), combine the ratio characteristics of Nb/Ta、Th/Yb、（Th/Nb）N and Nb/La consideration, the occurrence of EarlyTriassic diorites in the Sayabouli region suggest that NW Laos was dominated by subduction-related environment. |
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