In situ U-Pb dating of xenotime by laser ablation (LA)-ICP-MS
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- 作者：ZhiChao Liu (1) (2)
FuYuan Wu (1)
ChunLi Guo (3)
ZiFu Zhao (4)
JinHui Yang (1)
JinFeng Sun (1) (2) - 关键词：xenotime ; laser ablation (LA) ; ICP ; MS ; U ; Pb dating
- 刊名：Chinese Science Bulletin
- 出版年：2011
- 出版时间：September 2011
- 年：2011
- 卷：56
- 期：27
- 页码：2948-2956
- 全文大小：773KB
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FuYuan Wu (1)
ChunLi Guo (3)
ZiFu Zhao (4)
JinHui Yang (1)
JinFeng Sun (1) (2)
1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
2. Graduate University of Chinese Academy of Sciences, Beijing, 100049, China
3. Institute of Mineral Deposits, Chinese Academy of Geological Sciences, Beijing, 100037, China
4. School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China - ISSN：1861-9541
文摘
Xenotime is an ideal mineral for U-Th-Pb isotopic dating because of its relatively high U and Th contents, but typically low concentration of common Pb. These characteristics, and the fact that it is widespread throughout various types of rocks, suggest that the U-Th-Pb dating of xenotime has broad applications. Studies of U-Pb dating on xenotime by ion microprobe (such as SHRIMP) have increased in recent years, whereas studies by laser ablation (LA)-ICP-MS are still rare. In this study, we developed a technique for U-Pb dating of xenotime using the 193 nm ArF laser-ablation system and Agilent 7500a Q-ICP-MS. To evaluate the reliability of our method, a xenotime standard, BS-1, was analyzed and calibrated against another xenotime standard, MG-1. The weighted mean 206Pb/238U ages of 510.1 ± 5.2 Ma (2 σ, n = 21), 509.8 ± 4.3 Ma (2 σ, n = 21) and 510.0 ± 4.6 Ma (2 σ, n = 21) were obtained using beam diameters of 16, 24 and 32 μm, respectively. These ages are identical to those determined by ID-TIMS method (weighted mean 206Pb/238U age of 508.8 ± 1.4 Ma), which supports the reliability of our LA-ICP-MS method. We also analyzed xenotimes in leucogranites from South Tibet and granites from Xihuashan in southern China, and obtained accurate and precise ages. Nevertheless, we observed systematic differences in Pb/U fractionation among xenotime, monazite and zircon. The matrix-effect resulted in either under-correction or over-correction of fractionation, and thus led to inaccurate ages. Thus, a matrix-matched material is required for U-Pb dating of xenotime by LA-ICP-MS.