中文摘要：

青藏高原第四纪冰川时空演化问题广受关注。应用宇宙成因核素暴露年龄测定方法开展高原古冰川的年代学研究，对青藏高原聂拉木、唐古拉山、义敦海子山和折多山等4个地区的第四纪冰碛物进行了10^Be，26^Al和21^Ne暴露年龄测定，获得了青藏高原不同地点第四纪冰川发育的年代学数据，结果表明青藏高原出现了多期第四纪冰期，分别为YD事件、末次冰期晚阶段、末次冰期早阶段、倒数第2次冰期和倒数第3次冰期。

英文摘要：

There are typical moraines in four areas in the Qinghai-Xizang Plateau. We obtained data of the moraines age through surface exposure age dating. Three glaciations have been recognized near the Nielamu County, in subsequence formed during 51.7 - 93.7kaB. P., 113.5 - 203.4kaB. P., and 268. 1 - 321. 5kaB. P. Older glaciation in Xixiabangma and Nieniexiongla are believed to exist near the county. The exposure age dating of glacial erratic boulders confirms two glaciations in Tanggula, and the ages are about 70.5kaB. P. and 162.3 - 210.0kaB. P. By the analysis of geological and morphologic features, an older moraine in the high terrace, south to the Tanggula is discovered. The exposure age dating of glacial boulders in Haizishan and Zheduoshan confirms the last glaciation, the Heinrich Event 1, and the Younger Dryas. Based on geological and morphologic features of the highest terrace boulder in Haizishan, the exposure age might be younger than the actual one. Although we have obtained this first set of data of exposure ages of moraines in the plateau, the temporal and spatial frame of the Quaternary glaciations in the plateau is not yet known completely. With dating of moraine in more places in the plateau, we hope to understand Quaternary glaciations in this region better, which will play important role in the PAGES.