Fig. 4

Comparison of thermal/denudation histories between the S-traverse and N-traverse. Vertical blue lines in the graphs show the boundary between the fore-arc side and the OBR/back-arc side. Numbers on the map denote the sample localities in the N- and S-traverse corresponding to the sample codes in the graphs (a, c). Pink lines show hot fingers (Tamura et al. 2002). The map was drawn using GMT (Wessel and Smith 1991) and 30 arc-second grid of the General Bathymetric Chart of the Oceans (GEBCO). Active fault traces in red lines are cited from Nakata and Imaizumi (2002). a AHe/ZHe ages and denudation rates plot along the S-traverse. Weighted mean ages and minimum ages within ± 95% confidence intervals were plotted using data from Sueoka et al. (2017) after Fitzgerald et al. (2006). Gray data for ZHe show less reliable because their grain ages are over-dispersed. b Mean denudation rates and their uncertainties along the S-traverse. These rates were reported from Sueoka et al. (2017) using geothermal gradients of Tanaka et al. (2004). Data calculated using the database of GSJ (2009) were computed in this study. c AHe/ZHe ages and denudation rates plot along the N-traverse. Weighted mean ages and minimum ages within ± 95% confidence intervals were plotted after Fitzgerald et al. (2006). Gray data are less reliable because their grain ages are over-dispersed. d Mean denudation rates and their errors along the N-traverse. These rates were calculated using geothermal gradients from Tanaka et al. (2004) and GSJ (2009). FST04 was not calculated because its weighted mean age was not adopted