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Extraction and purification of quartz for in situ cosmogenic nuclide exposure dating

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Authors:Zhang Li; Wu Zhenkun; Song Shaohua; Chang Hong; Zhao Guoqing
Author Affiliations:Primary:
Chinese Academy of Sciences, Institute of Earth Environment, Xi'an, China
Volume Title:Yankuang Ceshi Rock and Mineral Analysis
Source:Yankuang Ceshi = Rock and Mineral Analysis, 31(5), p.780-787. Publisher: Dizhi Chubanshe, Beijing, China. ISSN: 0254-5357
Publication Date:2012
Note:In Chinese with English summary. 38 refs.; illus., incl. 5 tables
Summary:10Be and 26Al in situ cosmogenic nuclide exposure dating is a relatively new dating technique widely used in geoscience research. Normally, the BeO and Al2O3 measured by AMS are prepared from purified quartz samples. Therefore, it is crucial to develop a method to extract pure quartz from rock samples in fieldwork. Based on an experimental procedure at Kohl and Nishiizumi, a comparison was made between different etching effects on samples using a heated water bath oscillator and hot-dog machine (roller) with different grain sizes of 0.25-0.50 mm and 0.50-1.0 mm. 1% or 2% HF-HNO3 was applied to dissolve the silicates in the hot-dog roller machine with a solid/liquid ratio of 15. Detailed heavy liquid (sodium polytungstate) separation steps for quartz purification are also described in this paper. This pretreatment method was verified using quartz from the river area around the North Qilian Mountains. The results indicate that SiO2 content in purified quartz is greater than 98%, and the Al content is less than 200 µg/g, according to X-ray Diffraction (XRD) and Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES). High purity quartz was obtained by the established pretreatment method, which met the requirements for 10Be and 26Al exposure dating.
Subjects:Accelerator mass spectroscopy; Al-26; Alkaline earth metals; Aluminum; Be-10; Beryllium; Cosmogenic elements; Geochronology; Isotopes; Mass spectroscopy; Metals; Methods; Purification; Radioactive isotopes; Sample preparation; Sequential extraction; Spectroscopy
Record ID:696920-4
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