晚更新世以来青藏高原东部黄土沉积过程与环境演化

青藏高原东部广泛分布的黄土和相关风成堆积，与高原内部和亚洲内陆干旱化过程密切相关，是研究高原隆升环境效应和干旱环境演化的理想材料。本项目计划围绕青藏高原东部黄土及其以西的黄河-长江源区的风沙区,选择六条西北-东南走向的地质横断面，包括典型晚更新世-全新世黄土、古沙丘和风沙沉积，利用目前广泛用于风成沉积物的、可靠的光释光测年和放射性碳十四测年技术，进行详细的年代学研究，获得不同时期风沙活动历史、黄土沉积通量和沉积速率记录，进而开展多环境指标综合研究，分析黄土沉积与风沙分布在空间和时间的耦合关系，深入探讨高原黄土的沉积过程，传输路径，环境演化历史及其与高原隆升过程、干旱环境演化的关系。

Loess and associated aeolian deposits are widespread in the eastern Tibetan Plateau(TP). These deposits have the potential to provide valuable archives to understand the effects of the tectonic uplift and the evolution of arid environment in the TP since late Pleistocene.This study focuses on the loess deposits in the eastern TP, and the sands/dune deposits in the Huanghe-Changjiang Headwaters region. Six typical transections from NW to SE, including sand sheets, paleo-dunes, loess-paleosol sequences,will be investigated using detailed optically stimulated luminescence (OSL) and AMS 14-C dating methods to resconstruct the high resolution aeolian sediment rates, dust flux,and aeolian activities history since the last glacial. Based on the reliable chronology, the detailed environmental records can be built by multiple proxies to investigate the aeolian process, dust passports, aridification history, and the effects of the climate changes and the Tibetan uplift.