甘肃玉门地区第四纪晚期构造阶地的红外释光测年

光释光（ＯＳＬ）测年是近几年从热释光（ＴＬ）测年基础工起来的测定第四纪沉积物年龄的一种新技术，其原理与ＴＬ测年类似。不同的是：ＯＳＬ是单色光束激发品体中储存的电离辐射能使其以光的形式释放出来。当用近红外线束作为激光光源时称之为红外释光测年。与ＴＬ测年相比，ＩＳＬ测年可以不考虑残留的ＯＳＬ信号，而且测量具有简便，迅速且准确等优点。本文用细颗粒红外释放技术对玉门地区的构造阶地进行了年龄测定，初步结果表

INFRARED STIMULATED LUMINESCENCE DATING OF SEDIMENTS FROM QUATERNARY TECTONIC TERRACES IN YUMEN, GANSU PROVINCE

The optically stimulated luminescence (OSL) dating method, a technique closely related to TL, which is developing extensively in recent years, determines the time since the sediment was last exposed to sunlight. A monochromatic light is used in OSL dating, instead of heat, to excite electrons (or holes) from thermally stable light sensitive traps on a geological time scale. The luminescence obtaned from feldspar grains when they are stimulated by infrared photons, is termed infrared stimulated luminescene (IRSL). The OSL dating technique offers several major advantages over conventional TL dating. Not only is the residual signal following deposition lower for OSL, but also much improved signal to noise ratios, greater precision and speed of sample measurement, and some degree of mineral selectivity. IRSL dating of sediments from Quaternary tectonic terraces in Yumen, Gansu Province, demonstrates that the formation periods of terraces of Shiyouhe, Baiyanghe and Dahuanggou are at about 90,70,44,29,20,13 and 5.6 ka B.P. respectively, which shows agreement with field observation.