Fig. 3

Effective uranium (eU) versus (U–Th–Sm)/He grain age of apatite. The vertical error bars denote the ±1σ, ±2σ, and ±3σ ranges. The two horizontal red lines indicate the weighted mean age +95% confidence interval (CI) and −95% CI, respectively
Effective uranium (eU) versus (U–Th–Sm)/He grain age of apatite. The vertical error bars denote the ±1σ, ±2σ, and ±3σ ranges. The two horizontal red lines indicate the weighted mean age +95% confidence interval (CI) and −95% CI, respectively