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Earth, Planets and Space
Fig. 8 | Earth, Planets and Space

Fig. 8

From: Thermochronology of hydrothermal alteration zones in the Kii Peninsula, southwest Japan: an attempt for detecting the thermal anomalies and implications to the regional exhumation history

Fig. 8

Fission-track length histograms of (a) apatite and (b) zircon, integrated for 17 sedimentary and two alteration zone samples studied (Additional file 6: Figs. S5 and Additional file 7: Fig. S6). The track length distribution of zircon is shown with different infill colors for tracks marking azimuth angles that are higher (dark blue column) and lower (light blue column) than 60° to the crystallographic c-axis, because track lengths in zircon are dependent on etching and annealing properties, which exhibit angular variation (Hasebe et al. 1994; Yamada et al. 1995). c Radial plots (Galbraith 1990) of ZFT ages integrated for 19 samples. Plots were drawn using IsoplotR software (Vermeesch 2018). d Inverse-thermal-history models based on integrated FT ages and FT length data. Modeling was carried out using HeFTy v.1.9.3 software (Ketcham 2005). The constraints were determined based on geological and geochronological evidence to reconstruct burial and exhumation of the Haroku Formation (Additional file 1: Text S4). No good paths were obtained from the generated paths. [Acc., acceptable; Av, mean length ± 1σ; GOF, goodness of fit; n, population size; N, number of fission-track lengths measured]

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