New Data on the Age and Exhumation Time of Sedimentary Complexes of the Kronotskii Terrane and the Tyshevka Basin (Eastern Kamchatka) Based on Track Dating of Apatite

摘要

New data on the fission track ages of apatite detrital grains from Eocene-Miocene deposits of different ages in the Kronotskii Peninsula and the Tyushevka (Tyushevsky) Basin, Eastern Kamchatka are given. The data obtained give us grounds to distinguish three age groups of apatite grains: 31 +/- 5, 11-15, and 6-9 Ma. The exhumation ages of sedimentary complexes containing the studied apatite grains are compared with the times of the main tectonic events in Eastern Kamchatka. It is concluded that the collision processes continued from the Oligocene to the Late Miocene.