The certified results of ZMT04 muscovite reference material utilized for Ar-40/Ar-39 isotopic geochronological research on Early precambrian rocks in China
文献类型：期刊论文
| 作者 | Sang HaiQing1; Wang Fei1; Gong JunFeng2; Zhou Jing2 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2013-08-01 |
| 卷号 | 29期号:8页码:2759-2774 |
| 关键词 | Zmt04 Muscovite Homogeneity Chek Certification Of k And Ar-40** Ar-40-ar-39 Dating |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | In the Ar-40-Ar-39 dating technique, the irradiation with a high integrated neutron dose is very desirable for any relatively old sample. In that occasion, if the neutron flux monitor is much younger than the unknown age sample, the Ar-40/Ar-39 ratio in standard may become very small, approaching a smaller limit value (approximate to 3). Therefore, it is quite necessary to prepare an old age standard for the flux monitor of the Ar-40-Ar-39 method, especially for isotopic geochronological research on Early Precambrian rocks and meteorites. ZMT04 muscovite as K-Ar age geostandard of China, were separated from a pegmatite dike which occurs at Tianpishan area, in the southwest of Zhuozi County, Inner Mongolia of China. The pegmatite consists of muscovite, quartz and minor zircon, sphere etc. About 1080g of pure ZMT04 muscovite was obtained at the (10 x 1 x 0. 02) mm fraction. The purity is about 100%. Following mixing, the ZMT04 muscovite was divided into 14 jars about 77g each. Each jar sample was further subdivided into14 aliquots about 5. 51g each (total 196 aliquots). One aliquot (prefixed C) was retained for control analysis of K and Ar-40*, the other 13 aliquot of the same jar remain to be used fo interlabortory work. Ar-40-(39) Ar age spectrum of ZMT04 muscovite indicats that the muscovite has remained undisturbed since its crystallisation. The plateau age age is 1823 +/- 15Ma. Thirteen stepwise hating Ar isotopic data of the muscovite give a 4 Ar/39Ar isochron age of 1824 +/- 15Ma and the initial Ar-40/Ar-36 ration of 288 +/- 16, and the MSWD in the Ar-40/Ar-36-Ar-40/Ar-36 isochron diagram is 2. 10. This age may represent the crystallization time of the muscovite in the pegmatite dike. The homogeneity tests and the certification analyses of 4 Ar* and K in ZMT04 muscovite were performed according to the rules from the International Standard Organization (ISO) Guid 35 (1985) and primary referenc material technique of China (1994). During the homogeneity tests the analyses of K and Ar-40* in 77-600 hornblende, Hb3gr hornblende and BSP-1 hornblend were done and the results are almost coincident with their mean value published. The K-Ar and Ar-40-Ar-39 dating, homogeneity tests were performed in Ar isotopic laboratory of Institute of Geology and Geophysics, Chinese Academy of Science (IGGCAS). The sample weights are 30mg for Ar-40* and 40mg for K. Statistical estimate of analytical data show that F values of K and 4 Ar* are less than their critical F values. The test results indicate that the uncertainty caused by homogeneity of the sample is 0. 18% for radiogenic Ar-40* and 0. 24% for K, respecitively. A good reproducibility of analysis has been got in IGGCAS. Accordingly, the mininum weight of about 4mg of recommended sample should be proper. Eight laboratories accepted the invitation to participate in calibrations of (40) Ar* and K of ZMT04 muscovite. K-calibrations have been done with flame photometry and atomic absorption. The calibrations of Ar-40* were performed by using isotopic dilution method, Ar-38 spike and Ar-40/39Ar techniques. The Grubbs and Dixon tests indicate that there is no outzr in all data from 8 laboratories. The calculations of skewness and kurtosis coefficients, and the Cochran isoprecision indicate that all data of K and Ar-40*, obey a normal distribution. |
| WOS关键词 | STRAIGHT-LINE ; K-AR ; INTERCALIBRATION ; STANDARDS ; ERRORS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000323689100012 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/86274]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Sang HaiQing |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithsphere Evolut, Beijing 100029, Peoples R China 2.Peking Univ, Sch Earth & Space Sci, Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sang HaiQing,Wang Fei,Gong JunFeng,et al. The certified results of ZMT04 muscovite reference material utilized for Ar-40/Ar-39 isotopic geochronological research on Early precambrian rocks in China[J]. ACTA PETROLOGICA SINICA,2013,29(8):2759-2774. |
| APA | Sang HaiQing,Wang Fei,Gong JunFeng,&Zhou Jing.(2013).The certified results of ZMT04 muscovite reference material utilized for Ar-40/Ar-39 isotopic geochronological research on Early precambrian rocks in China.ACTA PETROLOGICA SINICA,29(8),2759-2774. |
| MLA | Sang HaiQing,et al."The certified results of ZMT04 muscovite reference material utilized for Ar-40/Ar-39 isotopic geochronological research on Early precambrian rocks in China".ACTA PETROLOGICA SINICA 29.8(2013):2759-2774. |
入库方式： OAI收割
来源：地质与地球物理研究所
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