[MGI25-P03] Sub-Quaternary exhumation rate changes in the Hida range of the Japanese Alps
Keywords:Quaternary, Glaciation, Thermochronometry, Exhumation, Luminescence, ESR
The ESR and OSL data yield similar cooling histories indicating rapid erosion of the Hida range over the past 100 ka. Inverting the data for exhumation rates, assuming a geothermal gradient of 60 oC/km reveals a reduction in rates from ~10 mm a-1 throughout MIS4, during which the most intense glaciation of the Japanese Alps occurred (Iwata, 2003), to ~1-3 mm a-1 over the past 20 ka. Our preliminary data indicate that exhumation rates within the Hida range were higher under a cooler and wetter climate and that glacial erosion processes may have been significant at sub-Quaternary timescales.
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