| LA-MC-ICP-MS独居石微区原位U-Pb同位素年龄测定 |
| 点此下载全文 |
| 引用本文：崔玉荣,周红英,耿建珍,李怀坤,李惠民.2012.LA-MC-ICP-MS独居石微区原位U-Pb同位素年龄测定[J].地球学报,33(6):865-876. |
| DOI：10.3975/cagsb.2012.06.04 |
| 摘要点击次数: 4209 |
| 全文下载次数: 6016 |
|
| 基金项目:国土资源部公益性行业科研专项“非锆石类富铀矿物U-Pb同位素定年方法研究”(编号: 200911043-15) |
|
| 中文摘要:独居石富含U、Th, 同时具有较低的初始普通Pb含量, 是U-Pb和Th-Pb同位素定年的理想对象。由于普遍存在于多种岩石中, 独居石的U-Th-Pb定年具有广阔的应用前景。本文报道利用193 nm ArF准分子激光剥蚀系统和NEPUNE多接收器电感耦合等离子体质谱仪, 对独居石进行微区原位U-Pb同位素年龄测定的新方法。运用这一新方法对独居石样品AL01、BL02和CL03进行微区原位U-Pb同位素年龄测定, 获得AL01和BL02号样品的206Pb/238U年龄加权平均值分别为(288.3±1.1) Ma (n=19)和(446.8±2.3) Ma (n=41); CL03号样品的U-Pb等时线年龄为(396.8±8.8) Ma (n=55), 取得了令人满意的结果。 |
| 中文关键词:独居石 微区原位 LA-MC-ICP-MS U-Pb同位素测年 |
| |
| In Situ LA-MC-ICP-MS U-Pb Isotopic Dating of Monazite |
|
|
| Abstract:Characterized by rich U, Th and low initial Pb content, monazite is an ideal object for U-Pb and Th-Pb isotopic dating. Due to the existence of monazite in a variety of rocks, the U-Th-Pb dating of monazite has a broad application prospect. A new method is reported in this paper. The monazite samples were analyzed by using 193 nm ArF excimer laser ablation system coupled with NEPUNE multi-collector inductively coupled plasma mass spectrometer. The monazite samples AL01, BL02 and CL03 were dated by this method. The weighted average 206Pb/238U ages of AL01 and BL02 were (288.3±1.1) Ma (n=19) and (446.8±2.3) Ma (n=41) respectively, and the isochron age of CL03 was (396.8±8.8) Ma (n=55), showing satisfactory results. |
| keywords:monazite in situ LA-MC-ICP-MS U-Pb isotopic dating |
| 查看全文 查看/发表评论 下载PDF阅读器 |
