岩矿测试2012，Vol.31Issue(5)：780-787,8.
原地宇宙成因核素暴露测年方法中石英的提取
Extraction and Purification of Quartz for in situ Cosmogenic Nuclide Exposure Dating
摘要
Abstract
Be and Al in situ cosmogenic nuclide exposure dating is a relatively new dating technique, which is widely used in geoscience research. Normally, the BeO and A12O3 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-HNO, 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 |JLg/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 26A1 exposure dating.关键词
原地宇宙成因核素/10Be/26Al/石英/提取纯化Key words
in-situ cosmogenic nuclides/ l0Be/ 26A1/ quartz/ extraction and purification分类
天文与地球科学引用本文复制引用
张丽,武振坤,宋少华,常宏,赵国庆..原地宇宙成因核素暴露测年方法中石英的提取[J].岩矿测试,2012,31(5):780-787,8.基金项目
国家重点基础研究发展计划(973计划)项目(2010CB833400) （973计划）
国家自然科学基金项目(41023006) （41023006）
