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Tanz zircon megacrysts: a new zircon reference material for the microbeam determination of U-Pb ages and Zr-O isotopes

文献类型：期刊论文

作者Hu, Zhaochu3; Li, Xian-Hua1; Luo, Tao3; Zhang, Wen3; Crowley, James7; Li, Qiuli1; Ling, Xiaoxiao1; Yang, Chuan6; Li, Yang1; Feng, Lanping3
刊名JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
出版日期2021-10-27
页码20
ISSN号0267-9477
DOI10.1039/d1ja00311a
英文摘要We present detailed characterization of Tanz zircon megacrysts for the microbeam determination of U-Pb ages, Zr isotopes, Hf isotopes, O isotopes and trace element mass fractions. This batch of dark brown zircon megacrysts from Tanzania contains 269 +/- 103 mu g g(-1) U (Th/U similar to 0.154), and its total weight is 9.06 kg. The largest Tanz zircon megacryst in this batch weighs 366 grams. The calculated average accumulated alpha-radiation dosage is 0.54 x 10(18) events per g for the Tanz zircon, which correlates with a 'well crystallized' structure. Through a large number of laser ablation ICP-MS, laser ablation MC-ICP-MS and SIMS measurements, it is found that Tanz zircon megacrysts are quite uniform in U-Pb ages, O isotopes and Zr isotopes at scales of tens of microns. The Tanz zircon has chemical abrasion isotope dilution TIMS (CA-ID-TIMS) determined mean isotopic ratio values of 0.09180 +/- 0.00013 (2SD, n = 47) for Th-230 corrected Pb-206/U-238, 0.7473 +/- 0.0014 (2SD, n = 47) for Pb-207/U-235 and 0.059069 +/- 0.000067 (2SD, n = 47) for Th-230 corrected Pb-207/Pb-206. The CA-ID-TIMS method yielded a mean Th-230 corrected Pb-206/U-238 age of 566.16 +/- 0.77 Ma (2SD, n = 47). The determined mean delta O-18(VSMOW) and delta Zr-94/90(SRM3169) values of the Tanz zircon megacrysts are 6.52 +/- 0.28 parts per thousand (2SD, n = 29) and -0.01 +/- 0.06 parts per thousand (2SD, n = 35) by gas source mass spectrometry and double spike TIMS, respectively. All of these values are in good agreement with the statistical mean values of microbeam measurements and are proposed as the best reference values for Tanz zircon megacrysts. These features make the Tanz zircon megacrysts suitable as primary U-Pb age and Zr-O isotope reference materials for microbeam analysis. However, our LA-MC-ICP-MS data suggest a relatively wide distribution of Hf isotope compositions in the Tanz zircons (0.281821 +/- 0.000042, 2SD, n = 321), which makes Tanz zircons not an ideal Hf isotope reference material for microbeam analysis. We propose the Tanz zircon megacrysts as a potential reference material for the primary external calibration or monitoring of analytical validation for microbeam determination of U-Pb ages and Zr-O isotopes.
WOS关键词NATURAL REFERENCE MATERIAL ; LASER-ABLATION QUADRUPOLE ; PLASMA-MASS SPECTROMETRY ; HIGH-PRECISION ; TRACE-ELEMENT ; WORKING REFERENCE ; HF ISOTOPES ; ID-TIMS ; TH-PB ; GEOCHRONOLOGY
资助项目National Science Fund for Distinguished Young Scholars[41725013] ; National Natural Science Foundation of China[41873029] ; National Natural Science Foundation of China[41903015] ; China National Space Administration[D020205] ; Natural Science Foundation of Hubei Province[2020CFA045] ; MOST Special Fund from the State Key Laboratories of Geological Processes and Mineral Resources
WOS研究方向Chemistry ; Spectroscopy
语种英语
WOS记录号WOS:000716555800001
出版者ROYAL SOC CHEMISTRY
资助机构National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China National Space Administration ; China National Space Administration ; Natural Science Foundation of Hubei Province ; Natural Science Foundation of Hubei Province ; MOST Special Fund from the State Key Laboratories of Geological Processes and Mineral Resources ; MOST Special Fund from the State Key Laboratories of Geological Processes and Mineral Resources ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China National Space Administration ; China National Space Administration ; Natural Science Foundation of Hubei Province ; Natural Science Foundation of Hubei Province ; MOST Special Fund from the State Key Laboratories of Geological Processes and Mineral Resources ; MOST Special Fund from the State Key Laboratories of Geological Processes and Mineral Resources ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China National Space Administration ; China National Space Administration ; Natural Science Foundation of Hubei Province ; Natural Science Foundation of Hubei Province ; MOST Special Fund from the State Key Laboratories of Geological Processes and Mineral Resources ; MOST Special Fund from the State Key Laboratories of Geological Processes and Mineral Resources ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China National Space Administration ; China National Space Administration ; Natural Science Foundation of Hubei Province ; Natural Science Foundation of Hubei Province ; MOST Special Fund from the State Key Laboratories of Geological Processes and Mineral Resources ; MOST Special Fund from the State Key Laboratories of Geological Processes and Mineral Resources
源URL[http://ir.iggcas.ac.cn/handle/132A11/103816]  
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Hu, Zhaochu
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
3.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
5.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China
6.British Geol Survey, Keyworth NG12 5GG, Notts, England
7.Boise State Univ, Dept Geosci, 1910 Univ Dr, Boise, ID 83725 USA
推荐引用方式
GB/T 7714		 Hu, Zhaochu,Li, Xian-Hua,Luo, Tao,et al. Tanz zircon megacrysts: a new zircon reference material for the microbeam determination of U-Pb ages and Zr-O isotopes[J]. JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY,2021:20.
APA Hu, Zhaochu.,Li, Xian-Hua.,Luo, Tao.,Zhang, Wen.,Crowley, James.,...&Hu, Shenghong.(2021).Tanz zircon megacrysts: a new zircon reference material for the microbeam determination of U-Pb ages and Zr-O isotopes.JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY,20.
MLA Hu, Zhaochu,et al."Tanz zircon megacrysts: a new zircon reference material for the microbeam determination of U-Pb ages and Zr-O isotopes".JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY (2021):20.

入库方式： OAI收割

来源：地质与地球物理研究所

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