萨拉乌苏地区末次冰期酒坊台剖面光释光年代及其环境意义

OSL Chronology and Palaeoenvironment Implications of Jiufangtai Section from the Salawusu Area during the Last Glaciation

中文关键词:  萨拉乌苏  末次冰期  光释光测年  环境变化

英文关键词:Salawusu  Last glaciation  Optically stimulated luminescence（OSL） dating  Environmental change

中文摘要:

      萨拉乌苏地区位于毛乌素沙漠东南部,属于东亚季风的北部边缘区。由于萨拉乌苏地区还拥有我国非常重要的旧石器考古遗址,该地区的气候变化广受国内外学者的关注。通过野外考察发现,在萨拉乌苏河谷酒坊台地区的上部地层中,广泛沉积有两层湖相沉积物。在米浪沟湾选择剖面,共采集了8个光释光样品,以此来恢复湖泊发育的年代及环境变化。根据地层沉积相对比和年代学结果,得出在约40~30 ka毛乌素沙漠东南边缘地区发育有古湖泊,说明当时的有效湿度较高。通过区域对比,发现毛乌素沙漠和其他亚洲季风区在氧同位素3阶段(MIS3)晚期都有古湖形成或高湖面记录,说明这些湖泊的演化过程存在一定的等时性,反映当时亚洲夏季风的增强及有效湿度的增加。

英文摘要:

      The Salawusu area is located in the southeast margin of the Mu Us Desert,which actually belongs to the northern margin area of the East Asian Monsoon.The Salawusu area is also a key Paleolithic site in northeastern Asia.Based on field observation,the anthors found there existed widely two layers of lacustrine sediments in the upper part of Jiufangtai sedimentary sequence in Salawusu valley.In order to date the age of the palaeolake and to reconstruct the climate changes,luminescence samples were collected f...