摘要
根据黄土样品和40～90μm纯石英和长石的氢氟酸(HF)和氟硅酸(H2SiF6)溶蚀实验,认为黄土样品用40%氢氟酸溶蚀40min,尽管可以全部溶蚀掉长石,但对石英的损失太大,不适合黄土中石英的分离。用30%氟硅酸(20mL/g)溶蚀6d,溶蚀分离黄土中40～90μm的石英颗粒,这样即可以溶蚀掉长石颗粒,又对石英损失较小。石英的纯度既可用IRSL来检测,也可用石英的110℃热释光(TL)峰来检测其纯度。
When quartz fraction is cleaned of feldspar grains by etching in concentrated HF for 40min,more quartz fraction is etched away,and this method may be not suitable for the purity of quartz in loess.As quartz fraction in loess is separated by the tedious process of etching with fluorosilicic acid for about 6 days,20ml 30% fluorosilicic acid per gram,not only the feldspars in loess can be removed completely, but also less quartz is etched away.The purification of quartz can be checked up not only by IRSL,but also by 110 ℃ TL peak of quartz.
出处
《地球科学与环境学报》
CAS
2004年第2期85-87,共3页
Journal of Earth Sciences and Environment
基金
国家自然科学基金项目(40071006)
关键词
黄土
释光测年
分离
溶蚀
石英
luminescence dating
quartz
separation
etch
loess
