青藏高原湖泊沉积研究及其进展

Researches on Lacustrine Sediments in Tibetan Plateau and Their Progress

青藏高原湖泊沉积研究主要围绕青藏高原隆升和全球变化响应开展的。研究揭示了青藏高原隆升具有整体性、阶段性和后期加速性。中晚更新世以来和末次间冰期-冰期气候演化过程得到重建,并能够与冰芯和深海氧同位素记录对比;同时也存在MIS3阶段强烈暖湿和末次冰盛期冷湿等区域特征;新仙女木事件在湖泊沉积物也有明显记录。全新世研究表明青藏高原早期暖湿并经历冷事件,大暖期普遍出现高水位,后期气候向干冷化方向发展。湖泊沉积环境定量化重建也得到研究。青藏高原湖泊沉积应在高分辨率纹层沉积和环境指标定量分析基础理论方面加强研究。

Researches on lacustrine sediments in Tibetan Plateau have been mainly focused on the upnlt oi Tibetan Plateau and their reflection to global change, Fruits achieved till now indicate that the uplift of Tibetan Plateau is characteristic of whole, stage, acceleration in later period. Climate was reconstructed during middle- late Pleistocene and last interglacial and glacial, in accordance with that recorded by oxygen isotope in cores from ice and deep sea. Nevertheless, regional differences, such as strong warm-wet during MIS3 and cold-wet during Last Glacial Maximum, are also shown. The Younger Dryas event is clearly reflected by lacutrine sediments. Studies on Holocene indicate warm-humid climate and occurring cooling events during early period, high lakelevels during the megathermal period, and advance toward cold-dry during late period. Quantitative researches on depositing environments have been developed for recent years. More studies should be strengthened on highresolution varved sediments and basic theories on quantitative analysis of proxy indicators.