In situ U-Pb dating of apatite-titanite by LA-ICP-MS
- Journal of Northwest University (Natural Science Edition) Vol. 53, Issue 6, Pages: 1030-1040(2023)
- 作者机构：
西北大学 地质学系/大陆动力学国家重点实验室，陕西 西安 710069
- 作者简介：
- 基金信息：
DOI：10.16152/j.cnki.xdxbzr.2023-06-012
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ZHANG Yan, BAO Zhian, CHEN Kaiyun, et al. In situ U-Pb dating of apatite-titanite by LA-ICP-MS. [J]. Journal of Northwest University (Natural Science Edition) 53(6):1030-1040(2023)
ZHANG Yan, BAO Zhian, CHEN Kaiyun, et al. In situ U-Pb dating of apatite-titanite by LA-ICP-MS. [J]. Journal of Northwest University (Natural Science Edition) 53(6):1030-1040(2023) DOI： 10.16152/j.cnki.xdxbzr.2023-06-012.
摘要
利用西北大学大陆动力学国家重点实验室Agilent 7900四极杆电感耦合等离子体质谱和RESOLution S-155LR 193 nm ArF准分子激光，激光频率为6 Hz，束斑为67 μm（磷灰石）、43 μm（榍石），分别对5个标准磷灰石（Sume、Durango、Otter Lake、AP1和MRC-1）和4个标准榍石（Ontario、T4、T3和Pakistan）进行了原位微区U-Pb同位素测定。以MAP-3为标准样品，结合,207,Pb普通铅扣除法，测定了磷灰石样品U-Pb加权平均年龄，结果为：Sume（566.7±5.3）Ma、Durango（31.2±0.6）Ma、Otter Lake（901.3±9.6）Ma、AP1（472.0±3.9）Ma、MRC-1（155.4±1.8）Ma；以榍石BLR-1为外标，通过,207,Pb普通铅扣除法，测定了不同榍石样品U-Pb加权平均年龄，结果为：Ontario（1 044.4±4.2）Ma、T4（1 096.2±5.6）Ma、Pakistan（20.74±0.61）Ma、T3（1 102.9±5.8）Ma。各个样品年龄测定值在误差范围内与推荐值一致。结果表明，该研究方法可以准确地对磷灰石、榍石进行原位微区U-Pb定年测定，数据结果准确度高且可靠。磷灰石U-Pb定年测试方法的建立对于研究中温热年代学提供了重要的年龄信息。榍石U-Pb定年测试方法的建立对于探讨与变质作用和热液作用相关的年龄信息、查明地质体的P-T-t轨迹提供了重要的证据。
Abstract
The age of Sume, Durango, Otter Lake, AP1, MRC-1 standard apatites, and Ontario, T4, T3, Pakistan standard titanites were determined simultaneously by using Agilent 7900 inductively coupled plasma mass spectrometry and RESOLution S-155LR 193 nm ArF excimer laser ablation at the State Key Laboratory of Continental Dynamics, Northwest University, with laser frequency of 6 Hz and laser ablation spot size of 67 μm (apatite) and 43 μm(titanite). Using MAP-3 apatite as an external standard combined with ,207,Pb-correction method, the U-Pb weighted average ages of apatite samples, Sume(566.7±5.3)Ma, Durango(31.2±0.6)Ma, Otter Lake(901.3±9.6)Ma, AP1(472.0±3.9)Ma, MRC-1(155.4±1.8)Ma can be determined accurately.Using BLR-1titanite as an external standard combined with ,207,Pb-correction method, the U-Pb weighted average ages of titanite samples, Ontario(1 044.4±4.2)Ma, T4(1 096.2±5.6)Ma, Pakistan(20.74±0.61)Ma, T3(1 102.9±5.8)Ma can be determined accurately. These results are consistent with the recommended values within a reasonable range of error. The research results indicate that the established method can accurately determine the in-situ U-Pb dating of apatite and titanite, with high accuracy and reliability of the data results. The establishment of in situ apatite U-Pb provides important age information for medium temperature thermochronology studies. The establishment of in situ titanite U-Pb provides important evidences for exploring age information related to metamorphic and hydrothermal processes, and identifying P-T-t trajectories of geological bodies.
关键词
LA-ICP-MS磷灰石榍石U-Pb定年
Keywords
LA-ICP-MSapatitetitaniteU-Pb dating
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