Fig. 3From: (U–Th)/He thermochronometric mapping across the northeast Japan Arc: towards understanding mountain building in an island-arc settingEffective uranium (eU) ppm versus ZHe grain ages. Every grain range of age indicates ± 3σ range. Two horizontal green lines show the upper and lower limits of the weighted mean age, namely + 95% and − 95% confidence intervals. No green lines imply that the weighted mean age is unadopted because of poor reproducibilityBack to article page