First cosmic ray exposure dating (in situ produced Be-10) of the late pleistocene and holocene glaciation in the Nanhutashan Mountains (Taiwan)

作者：Carcaillet J^*; Siame L L; Chu H T; Bourles D L; Lu W C; Angelier J; Dussouillez P

来源：Terra Nova, 2007, 19(5): 331-336.

DOI：10.1111/j.1365-3121.2007.00756.x

In Taiwan, efficient climate-driven strong erosion processes are the leading cause for low preservation of geomorphic landforms. Despite the absence of present-day glaciers, glacial relicts have been reported in high altitude areas. These scarce landforms provide opportunities for reconstructing the timing of the last deglaciation in a region where glacial history is poorly documented. We have collected boulders and striated bedrocks in the Nanhutashan area and calculated surface exposure ages based on in-situ produced Be-10 concentrations. The oldest glacial remains, dated at 11.1 +/- 3.3 ka, correspond to the last glacial advance. The Holocene is characterized by a continuous retreat of the ice-cap until at least 7.2 +/- 1.0 ka. Our results are in agreement with a scenario where changes of monsoon regimes lead to a strong reduction of the winter monsoon during the early Holocene, causing a decrease of snow supply and disequilibrium of the hydrological budget.

• 出版日期2007-10