马兰黄土的热释光年龄(Ⅳ)——斋堂剖面的研究

THERMOLUMINESCENCE (TL) AGE OF MALAN LOESS (IV) ——AN INVESTIGATION OF THE ZHAITANG PROFILE

本文对北京斋堂马兰黄土剖面上的十三块标本进行了热释光年龄测定。采用了两种方法制备测量的样本,获得了两组热释光年龄数值,并对它们进行了分析和讨论。

This paper focusses on the study of loess by TL dating techniques. Thirteen samples were collected from the Malan section at Zhaitang, Beijing. Their ages have been determined. Two groups of specimens were prepared with two different methods. (1) The complex minerals with φ<74μm in diameter are dissolved with 15% aqua regia solution for 30 min. and 10% HF solution for another 30 min., and then the fine quartz concentrates are prepared as specimens for TL dating. (2) The specimens are directly determined without acid treatment. The results show that the acid-treatment specimen preparation procedure is more advantageous to TL dating of loess.