Fission track age of apatite from the jurassic and cretaceous granites in South Korea and its tectonic implications

摘要: Abstract Twenty-six apatite separates obtained from 35 Daebo and Bulgugsa granites in South Korea were dated studied by fission tracks. Apparent ages for the two groups are generally similar range about 40 to 80 Myr, which younger than emplacement indicate times at cooled below 100°C. Track length distributions suggest that emplaced katazone and/or mesozone initially slowly while epizone more rapidly. The relationship between topographic elevation of samples northeast suggests uplift was very slow before Early Tertiary but has probably increased subsequently a rate least 70 m/Myr this area.