Tilted uplift of the Kiso Range, central Japan, since 0.8 Ma constrained from low-temperature thermochronology

Sueoka, Shigeru   ; Kohn, B.*; Tagami, Takahiro*; Tsutsumi, Hiroyuki*; Hasebe, Noriko*; Tamura, Akihiro*; Arai, Shoji*

Fission-track (FT) and (U-Th-Sm)/He (He) analyses are used to constrain the denudation pattern and history of the Kiso Range. We obtained nine zircon FT ages (59.3-42.1 Ma), 18 apatite FT ages (81.9-2.3 Ma), and 13 apatite He ages (36.7-2.2 Ma). The younger apatite FT and He ages are interpreted as a reflection of uplift of the Kiso Range. On the basis of the distribution of the ages, we propose westward tilting uplift of the Kiso Range between the Inadani Fault Zone (IFZ) and StF. Based on thermal history obtained from apatite FT inverse modeling, we estimated denudation rates at 1.3-4.0 mm/y and maximum bedrock uplift rates at 3.4-6.1 mm/y since ca 0.8 Ma, the initiation of uplift of the Kiso Range.