A Potential Standard Zircon for Hf Isotopic Analysisoft-com:office:office" />
详细信息
- 责任者：Zhou Hongying (Tianjin Institute of Geology and Mineral Resources ; China Geological Survey ; Tianjin 300170 ; China) ; Li Huaikun
- 刊名：Acta Geologica Sinica
- 出版年：2013
- 卷期：87(4)
- 页码：p.554-564
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
The Wangjiangshan gabbro in Hannan intrusive complex in Xixiang County, Shaanxi Province, contains abundant zircons. Seven grams of zircons separated from 600 kg of gabbro samples are good in crystallization, simple in internal structure and origin, homogenious in U-Pb age and Hf isotopic composition, with crystal sizes ranging from 0.2 to 0.3 mm. The U-Pb dating of the zircons was carried out in three different laboratories using three different methods; consistent ages obtained are 819.8 ± 2.5 Ma (LA-ICP-MS), 821.7 ± 1.7 Ma (LA-MC-ICPMS) and 822.1 ± 4.5 Ma (SHRIMP). The Lu-Hf isotopic compositions of the zircons were measured in four authoritative laboratories and consistent 176Hf/177Hf ratios were obtained, with the weighted average 176Hf/177Hf ratio of the total 421 analyses falling within 0.282535 ± 0.000003 (2σ). The gabbro sampled is well-outcropped, fresh, large in size, and convenient to access. This zircon sample collected from the Wangjiangshan gabbro has met major requirements for Hf analysis standard and can serve as a standard zircon for Hf analysis. Preparation of Hf isotopic standard material is the basis for obtaining accurate and reliable determination of Hf isotopic data and has very important practical value and scientific significance.
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