Extraction and Purification of Quartz for in situ Cosmogenic Nuclide Exposure Dating

ZHANG Li; WU Zhen-kun; SONG Shao-hua; CHANG Hong; ZHAO Guo-qing

2012 Vol. 31, No. 5

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ZHANG Li, WU Zhen-kun, SONG Shao-hua, CHANG Hong, ZHAO Guo-qing. Extraction and Purification of Quartz for in situ Cosmogenic Nuclide Exposure Dating[J]. Rock and Mineral Analysis, 2012, 31(5): 780-787.

Citation:

ZHANG Li, WU Zhen-kun, SONG Shao-hua, CHANG Hong, ZHAO Guo-qing. Extraction and Purification of Quartz for in situ Cosmogenic Nuclide Exposure Dating[J]. Rock and Mineral Analysis, 2012, 31(5): 780-787.

Extraction and Purification of Quartz for in situ Cosmogenic Nuclide Exposure Dating

1.
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China
2.
Xi'an Accelerator Mass Spectrometry Center, Xi'an 710061, China
3.
Graduate University of Chinese Academy of Sciences, Beijing 100049, China
4.
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China
5.
Xi'an Accelerator Mass Spectrometry Center, Xi'an 710061, China
6.
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China
7.
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China
8.
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China
9.
Xi'an Accelerator Mass Spectrometry Center, Xi'an 710061, China

Received Date: 26 April 2012

Publish Date: 28 October 2012

Abstract

Abstract

10Be and 26Al in situ cosmogenic nuclide exposure dating is a relatively new dating technique, which is widely used in geoscience research. Normally, the BeO and Al2O3 measured by AMS are prepared from purified quartz samples. Therefore, it is key to develop a method to extract pure quartz from rock sampled in fieldwork. Based on the experimental procedure of Kohl and Nishiizumi, a comparison was made for the different etching effects on samples by using heated water bath oscillator and hot-dog machine (roller) with different grain size of 0.25-0.50 mm and 0.50-1.0 mm. The 1% or 2% HF-HNO3 were 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. The pretreatment method was verified by using quartz from the river area around North Qilian Mountain. The results indicate that SiO2 content in the purified quartz is greater than 98% and the Al content is less than 200 μg/g, by using X-ray Difrraction (XRD) and Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES). The high purity quartz was obtained by the established pretreatment method which met the requirements for 10Be and 26Al exposure dating.
- in-situ /
- cosmogenic /
- nuclides /
- ¹⁰Be /
- ²⁶Al