青藏高原东部风成黄土多技术源区示踪研究

The identification of aeolian dust sources is a basic issue of the loess study for understanding the aeolian process and the related air circulation pattern. The widespread loess deposits on the Tibet Plateau are encoded with important information of past atmospheric circulation pattern and acidification of the Plateau, as key roles in the global dust cycle. So far, considerable debates exist about the source of the loess on the eastern Tibet Plateau due to lack of the systematic and in-depth studies. To address this, we will employ the detrital single-grain zircon U–Pb dating with heavy mineral analysis, together with the Sr-Nd isotopes, the geochemical provenance method, and the geomorphological investigation and the modern circulation analysis, to trace the sources and transport pathways of the Tibetan loess deposits. It will be great helpful for further understanding the environment of the source area, transport dynamics of dust, and the atmospheric circulation pattern in the Tibetan Plateau.

风成黄土的物源研究是理解风尘过程和古大气环流的基础和关键。青藏高原上广泛分布的黄土沉积与过去环流变化、高原内部干旱化过程密切相关。迄今为止，青藏高原东部黄土的物质来源由于缺乏系统深入的研究，而存在巨大的争议。本项目针对青藏高原东部风成黄土沉积和其潜在源区，通过基于单颗粒碎屑锆石U-Pb年龄谱与重矿物组成，分粒级的锶钕同位素和元素地球化学等多物源示踪技术，并结合黄土地貌特征和现代环流分析，系统探讨青藏高原东部黄土的物质来源和传输路径，为深入理解高原黄土沉积古环境意义、高原粉尘起源、传输机制与环境效应，以及古大气环流格局提供新的可靠证据。

青藏高原粉尘活动对区域和全球环境有重要影响。由于缺少缺乏系统深入的研究，目前对于青藏高原黄土粉尘的物源和传输过程的认识明显不足，且存在大量争议。为解决这一科学问题，本项目针对青藏高原东部风成黄土沉积和其潜在源区，通过基于单颗粒碎屑锆石U-Pb年龄谱与重矿物组成，分粒级的锶钕同位素和元素地球化学等多物源示踪技术，并结合黄土地貌特征和现代环流分析，系统探讨了青藏高原东部黄土的物质来源和传输路径，表明青藏高原东部黄土主要来自于高原内部。研究结果为深入理解高原粉尘来源、传输机制与环境效应，高原黄土沉积古环境意义，以及古大气环流变化提供了新证据。