中文摘要：

对青藏高原北缘共和盆地沙珠玉河的尾间湖达连海钻孔沉积柱（40．92m）进行了14C年代测定（10个控制点）和粘土矿物分析（按20cm／70a间隔的分辨率）。沉积柱底部年龄为14．5cal ka BP。根据沉积柱粘土矿物的类型、组合、比率指标综合分析，重建了共和盆地14．5cal ka BP以来气候环境的演化历史。冰消期（14．5～10．0cal ka BP）盆地气候总体特征表现为干冷，盆地物理风化强；早中全新世（10．0～5．0cal ka BP）气候表现为温湿，盆地化学风化为主，气候最宜期发生在中全新世的6．0cal ka BP前后；晚全新世（5．0～0．0cal ka BP）气候表现为干冷，盆地物理风化盛行。末次冰消期以来，共和盆地粘土矿物记录的气候环境变化阶段与高原其它湖泊指标记录的阶段基本一致。共和盆地粘土矿物记录的气候环境兼有西风、季风模式的特征。

英文摘要：

A core 40.92 m in length was drilled in Dalianhai, the terminal lake of the Shazhuyu River in Gonghe Basin, northeast Tibetan Plateau. The chronology of the core was established by normal and AMS 14C dating methods at 10 controlling points of lake plant relics. The oldest age of the core bottom is 14.5 cal ka BP. The clay minerals from the core were analyzed with the resolution of 20 cm/70 a. The evolutionary history of palaeoclimate and palaeoenvironment of Gonghe Basin since 14.5 cal ka BP was reconstructed mainly by clay minerals with particle fraction. During the deglaciation period （14.5～10.0 cal ka BP）, the climate generally became dry and cold, with strong physical weathering. In the early-middle Holocene （10.0～5.0 cal ka BP）, the climate was wet and warm, with the climatic optimum at about 6.0 cal ka BP. Chemical weathering of this period was strong. In the late Holocene （5.0～0.0 cal ka BP）, the climate was similar to that of the deglaciation period, characterized by dryness and coldness and predominant physical weathering. The phases of climatic and environmental variation recorded by clay minerals were in accordance with those recorded by indices of other lakes on the plateau. The climatic and environment history of this basin shows some characteristics of Monsoon and Westerly models established since the last deglaciation period.