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Matrix effects during in situ U-Pb dating of perovskite with variable crystal structure: Evidence from the Tazheran Massif, Russia

文献类型：期刊论文

作者Sun, Jing1,2; Wu, Fu-Yuan3; Sklyarov, Eugene4,5; Sarkar, Chiranjeeb6; Liu, Chuan-Zhou3; Pearson, Graham D.6; Cheng, Zhe2; Mitchell, Ross N.3
刊名CHEMICAL GEOLOGY
出版日期2022-02-05
卷号589页码:13
关键词Matrix effects In situ dating Perovskite Tazheran Massif Crystal structure
ISSN号0009-2541
DOI10.1016/j.chemgeo.2021.120685
英文摘要U-Pb geochronology of perovskite is one of the most reliable means of dating notoriously difficult to date and economically important kimberlites, carbonatites, and skarns. Matrix effects-isotopic variations due to chemical composition and crystal structure-are known to affect in situ U-Pb dating, but have not been documented in perovskite. Perovskite from the Tazheran Massif, Russia, has become a commonly used standard for U-Pb dating, so rigorously testing its general applicability is therefore critical. In this study, comparison between U-Pb ages generated by precise isotope dilution-thermal ionization mass spectrometry (ID-TIMS) and in situ dating methods including both secondary ion mass spectrometry (SIMS) and laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) for a series of perovskite crystals from the Tazheran Massif (Tazh-1, Tazh-2, Tazh-3, Tazh-7B1, and Tazh-7Br) suggests that the in situ ages of some perovskite crystals (Tazh-1, Tazh-7B1, and Tazh-7Br) are systematically offset from their corresponding ID-TIMS ages. Hence, not all Tazheran perovskite grains are suitable as standards and some previously published work may suffer from unrecognized inaccuracies. Various factors are investigated in an attempt to identify the origin(s) of the matrix effect biasing the in situ measurements. Although there are so far only a limited number of perovskite grains analyzed by all SIMS, LA-ICPMS, and TIMS methods, grains Tazh-1, Tazh-7B1, and Tazh-7Br all have extremely low FeO, Nb, and LREE contents compared with the other Tazh perovskite and well characterized reference materials (AFK-5 and Ice River), indicating that such chemical variability may cause analytical differences. Furthermore, and perhaps more importantly, the Tazh-1, Tazh-7Bl, and Tazh-7Br perovskite grains are cubic and thus have different crystal structure from most Tazh perovskite and their standards that are orthorhombic. Therefore, crystal structure could be the principal reason for the matrix effect, with secondary matrix effects due to differences in chemical composition, that need to be taken into account in future in situ U-Pb dating of perovskite.
WOS关键词LA-ICP-MS ; KIMBERLITE MAGMATISM ; TRACE-ELEMENT ; ULTRAMAFIC LAMPROPHYRES ; AGE-DETERMINATION ; SOMERSET ISLAND ; KOLA-PENINSULA ; X-RAY ; GEOCHRONOLOGY ; ZIRCON
资助项目National Natural Science Foundation of China[42072060]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000768006500005
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/105007]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Sun, Jing
作者单位1.China Univ Petr, State Key Lab Petr Resources & Engn, Beijing 102249, Peoples R China
2.China Univ Petr, Coll Geosci, Beijing 102249, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Russian Acad Sci, Inst Earths Crust, Siberian Branch, Irkutsk 664033, Russia
5.Far East Fed Univ, Sch Engn, Vladivostok 690091, Russia
6.Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB, Canada
推荐引用方式
GB/T 7714		 Sun, Jing,Wu, Fu-Yuan,Sklyarov, Eugene,et al. Matrix effects during in situ U-Pb dating of perovskite with variable crystal structure: Evidence from the Tazheran Massif, Russia[J]. CHEMICAL GEOLOGY,2022,589:13.
APA Sun, Jing.,Wu, Fu-Yuan.,Sklyarov, Eugene.,Sarkar, Chiranjeeb.,Liu, Chuan-Zhou.,...&Mitchell, Ross N..(2022).Matrix effects during in situ U-Pb dating of perovskite with variable crystal structure: Evidence from the Tazheran Massif, Russia.CHEMICAL GEOLOGY,589,13.
MLA Sun, Jing,et al."Matrix effects during in situ U-Pb dating of perovskite with variable crystal structure: Evidence from the Tazheran Massif, Russia".CHEMICAL GEOLOGY 589(2022):13.

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来源：地质与地球物理研究所

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