| Non-matrix-matched analysis of U-Th-Pb geochronology of bastn?site by laser ablation inductively coupled plasma mass spectrometry |
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| 引用本文： | Tao LUO,He ZHAO,Wen ZHANG,Jingliang GUO,Keqing ZONG,Yongsheng LIU,Junfeng ZHANG,Zhaochu HU. Non-matrix-matched analysis of U-Th-Pb geochronology of bastn?site by laser ablation inductively coupled plasma mass spectrometry[J]. 中国科学:地球科学(英文版), 2021, 0(4): 667-676 |
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| 作者姓名： | Tao LUO He ZHAO Wen ZHANG Jingliang GUO Keqing ZONG Yongsheng LIU Junfeng ZHANG Zhaochu HU |
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| 作者单位： | State Key Laboratory of Geological Processes and Mineral Resources |
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| 基金项目： | supported by the National Science Fund for Distinguished Young Scholars (Grant No. 41725013);the National Natural Science Foundation of China (Grant Nos. 41903015 and 41873029);China National Space Administration (Grant No. D020205);the Natural Science Foundation of Hubei Province (Grant No. 2020CFA045);the MOST Special Fund from the State Key Laboratories of Geological Processes and Mineral Resources。 |
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| 摘 要： | Bastn?site is widespread in alkali granite, carbonatite and REE ore deposits. The U-Th-Pb ages of bastn?site can constrain the mineralization age. Currently, the lack of suitable in situ analysis reference material is the major obstacle of bastn?site U-Th-Pb geochronology. In this study, the matrix effects of U-Pb and Th-Pb age determination in bastn?site using glass NIST 610 as the external calibration reference were evaluated with the 193-nm excimer LA-ICP-MS analysis in normal and additional gases laser ablation modes. The obtained U-Th-Pb ages of bastn?site were approximately 7–11% lower than their reference values in the normal analytical mode(without additional gas). Fortunately, the determined systematic age biases in UTh-Pb dating were significantly reduced(less than 1–2%) with the addition of water vapor within the ablation chamber. This reduction may be attributed to the observed significant suppression of206 Pb/238 U and208 Pb/232 Th downhole fractionation in both NIST 610 glass and bastn?site by introducing a small quantity of water vapor in the ablation chamber. In addition, the obtained206 Pb/238 U and208 Pb/232 Th ages of bastn?site K-9, LZ1384, and MAD809 showed great consistency with their corresponding recommended values. The obtained results show that accurate and precise U-Th-Pb ages of bastn?site can be simultaneously obtained by using glass NIST 610 as the primary calibration standard in 193-nm LA-ICP-MS with the water vapor-assisted method. This simple and effective water vapor-assisted non-matrix-matched laser ablation method helps to promote the geological application of bastn?site U-Th-Pb geochronology.
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| 关 键 词： | LA-ICP-MS U-Th-Pb ages Non-matrix-matched method Bastn?site |
Non-matrix-matched analysis of U-Th-Pb geochronology of bastn(a)site by laser ablation inductively coupled plasma mass spectrometry |
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| Tao LUO,He ZHAO,Wen ZHANG,Jingliang GUO,Keqing ZONG,Yongsheng LIU,Junfeng ZHANG,Zhaochu HU. Non-matrix-matched analysis of U-Th-Pb geochronology of bastn(a)site by laser ablation inductively coupled plasma mass spectrometry[J]. Science in China(Earth Sciencess, 2021, 0(4): 667-676 |
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| Authors: | Tao LUO He ZHAO Wen ZHANG Jingliang GUO Keqing ZONG Yongsheng LIU Junfeng ZHANG Zhaochu HU |
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| Abstract: | Bastn(a)site is widespread in alkali granite,carbonatite and REE ore deposits.The U-Th-Pb ages of bastn(a)site can constrain the mineralization age.Currently,th... |
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