晚始新世至早渐新世气候转型事件是新生代以来最为快速和剧烈的全球性气候事件。这一事件对探究区域性气候、生物演替应对重大气候事件的响应具有重要意义。但相较于海洋，由于缺乏连续的沉积记录和精准的年代控制，尤其是低纬度地区，陆地生态系统对该事件的响应尚未明确，生物指标和非生物指标的交叉分析是解开这道谜题的一把密钥。吕合盆地位于青藏高原东南缘，包含完整的晚始新世至早渐新世的河湖相沉积记录，且具备孢粉学、古植物学、以及高精度的年代学研究基础。本项目将以吕合新生代盆地为研究对象，以高精度的元素地球化学分析和沉积学特征分析为手段，重建吕合盆地晚始新世至早渐新世千至万年时间分辨率上的元素地球化学和古气候特征，并结合申请者在博士期间对吕合盆地孢粉学研究的结果，探讨该区域晚始新世至早渐新世的植被、气候应对始新世-渐新世全球性气候转型事件、青藏高原的地貌演化、地球轨道参数周期性变化的响应。

The Eocene-Oligocene transition (EOT) was marked by a major environmental reorganization accompanied by an abrupt shift of the Earth system from “greenhouse” to “icehouse” conditions, which is well documented in marine sedimentary records.However, terrestrial records documenting this major climatic reorganization, high-resolution evidence from terrestrial contexts, especially from the low latitude area is rare. The sedimentary sequence in Lühe basin, southeastern margin of Tibetan Plateau, dated at 35-27Ma, provides an outstanding continental record of climatic processes across the EOT. This projcet aims to identify the nature of ecological change by sedimentary record，main and trace elements in Lühe section under the resolution of 10 kyr. Compared with previous palynological research results, we try to explore the climate changes under the influence of EOT, the uplift of Tibetan and the orbital cycles.