First dating of the maximum glacier extent in the Taiwanese high mountain range in the Late Pleistocene

山地冰川的范围和平衡线高度（ELA）作为冰期气候条件的敏感指标。来自亚洲各山脉的数据令人惊讶地表明，湿润季风东亚的最大冰川范围与全球气候末次极大期（LGM）不等时，并且发生在大约22 ka之前。台湾孤立的高山是东亚末次冰期的理想考察区域。它们的最高海拔为3952 m，目前未被冰川覆盖，但在晚更新世和全新世早期经历了多次冰川作用。然而，整个台湾地区冰川最大范围的冰川终点位置和最低ELA位置仍然未知，这是由于冰川后侵蚀强烈和各自山谷段的可达性较差。本项目采用原位产生的宇宙成因核素10Be和26Al进行岩石表面暴露测年，得到1。台湾北部（雪山）晚更新世最大山谷冰川期的时间限制；台湾中部（能高山）漩涡形成与冰川巨石搬运的时间约束。由于在2015年和2016年的两次活动中已经完成了在可到达的冰川末端位置的巨石表面和冰川圈中的岩石棒的实地测绘和采样，该项目侧重于实验室分析，以确定14个样品的核素浓度，随后的年龄计算，数据可视化以及古气候解释。

The extent and equilibrium line altitudes (ELA) of mountain glaciers are used as sensitive indictors for the climate conditions during glacial periods. Data from various Asian mountains suggest surprisingly, that the maximum glacier extent in the humid monsoonal eastern Asia was non-isochronic with the worldwide climatic last glacial maximum (LGM) and took place earlier than about 22 ka.The isolated high mountains of Taiwan represent an ideal investigation area for the timing of last glacial glacier stages in East Asia. Reaching their highest elevation at 3952 m, they are unglaciated at present, but have been subject to multiple glaciations during the Late Pleistocene and early Holocene. However, the positions of the glacier termini of the maximum glacier extent as well as the lowest ELA position are still unknown in entire Taiwan, which is due to the strong postglacial erosion and the difficult accessibility of the respective valley sections.This project applies rock surface exposure dating with in situ produced cosmogenic nuclides 10Be and 26Al to get1. time constraints of the late Pleistocene maximum valley glaciation in northern Taiwan (Hsueh Shan) and2. time constraints of cirque formation and glacial boulder transport in central Taiwan (Nengao Shan).As field mapping and sampling of boulder surfaces at an accessible terminal glacial position and of rock bars in glacial cirques were already accomplished during two campaigns in 2015 and 2016, the project focuses on the laboratory analyses for the determination of the nuclide concentrations of 14 samples, the subsequent age calculation, the data visualisation as well as a palaeoclimatic interpretation.