Intercalibration of ZBH-25 biotite reference material untilized for K-Ar and Ar-40-Ar-39 age determination.
文献类型：期刊论文
| 作者 | Sang HaiQing; Wang Fei; He HuaiYu; Wang YingLan; Yang LieKun; Zhu RiXiang |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2006-12-01 |
| 卷号 | 22期号:12页码:3059-3078 |
| 关键词 | biotite reference matrial homogeneity check analyses of K and Ar-40 K-Ar dating Ar-Ar dating |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | ZBH-25 biotite, as K-Ar age geostandard of China, were separated from Fangshan granodiorite complex in the southwest of Beijing, which occupies an area of 47 km(2). The granodiorite consist of biotite, hornblende, feldspar, quartz, and minor epidote, zircon, sphere ete. About 5800g of pure ZBH-25 biotite was obtained at the 0.25 - 0.63mm fraction. The purity is about 99.8%. ZBH-25 biotite belong to the kind of normal biotite mineral according to the chemical composition, X-fluorescenee spectrum infra-red absorption spectrum, X-ray diffraction and DAT curve. Following mixing, the ZBH-25 biotite was divided into 20 jars about 290g each. Each jar sample was further subdivided into 20 aliquots about 14.5g each (total 400 aliquots). One aliquot (prefixed C) was retained for control analysis of K and Ar-40 *, the other 19 aliquot of the same jar remain to be used fo interlabortory work. Ar-40-Ar-39 age spectrum of ZBH-25 biotite indicats that the biotite has remained undisturbed since its crystallisation and cooling. The plateau age (4 - 16steps) and total gases age (1 - 17steps) are 133.0 +/- 0.3Ma and 132.1 +/- 0.6Ma. The argon extraction occurs mainly between 600 - 1300 degrees C, and about 95.7% radiogenie Ar-40 can be released at that temperature rang. From the data of 4 - 16 steps heating the isochron age and the initial Ar-40/Ar-16 ration of the biotite are 133.1 +/- 1.3Ma and 293.5 +/- 1. 6, respectively. The correlation coefficient and MSWD in the isoehron diagram are 0. 99999 and 0. 4, respectively. The homogeneity tests and the certification analyses of Ar-40* and K in ZBH-25 biotites were performed according to the rules from the International Standard Organization(ISO) Guid 35( 1985) and primary referenc material technique of China (1990). During the homogeneity tests the analyses of K and Ar-40 * in 77600 hornblende, B600 biotite, GL-0 glauconite, PL-6 biotite and GA1550 biotite were done and the results are almost coincident with their mean value published. The homogeneity tests were performed in Ar isotopic laboratory of Institute of Geology and Geophysics, Chinese Academy of Science ( IGGCAS). The sample weights are 15 mg for Ar-40 * and 60 mg for K. Statistical estimate of analytical data show that F values of K and Ar-40* are less than their critical F values. The test results indicate that the uncertainty caused by homogeneity of the sample is 0.28 % for radiogenic Ar-40 * and 0.08 % for K, respecitively. A good reproducibility of analysis has been got in IGGCAS. Accordingly, the mininum weight of about 3.35 mg of recommended sample should be proper. Fourteen laboratories, accepted the invitation to participate in calibrations of Ar-40 * and K of ZBH-25 biotite. K-calibrations have been done with flame photometry and atomic absorption using Ar-40- Ar-39 technique. According to Grubs test, the K from laboratory 14 is an outlier which does not join the calculation of certificate value. The calibrations of Ar-40 * were performed by using isotopic dilution method, " Ar spike and 40Ar '9Ar techniques. The Grubbs and Dixon tests indicate that there is no outlier in all data from 14 laboratories. The calculations of skewness and kurtosis coefficients, and the Cochran isoprecision indicate that all data of K and4o Ar *, except the K value from laboratory 14, obey a normal distribution. |
| WOS关键词 | DATING STANDARDS ; AR-40/AR-39 ; CALIBRATION |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000245660400022 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/67086]  |
| 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 | Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithsphere Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sang HaiQing,Wang Fei,He HuaiYu,et al. Intercalibration of ZBH-25 biotite reference material untilized for K-Ar and Ar-40-Ar-39 age determination.[J]. ACTA PETROLOGICA SINICA,2006,22(12):3059-3078. |
| APA | Sang HaiQing,Wang Fei,He HuaiYu,Wang YingLan,Yang LieKun,&Zhu RiXiang.(2006).Intercalibration of ZBH-25 biotite reference material untilized for K-Ar and Ar-40-Ar-39 age determination..ACTA PETROLOGICA SINICA,22(12),3059-3078. |
| MLA | Sang HaiQing,et al."Intercalibration of ZBH-25 biotite reference material untilized for K-Ar and Ar-40-Ar-39 age determination.".ACTA PETROLOGICA SINICA 22.12(2006):3059-3078. |
入库方式： OAI收割
来源：地质与地球物理研究所
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