The Age and Exhumation Time of the Eastern Kamchatka Sedimentary Complexes Based on Apatite Track Dating

Abstract

The paper presents and analyzes new and previously published data on track dating of detrital apatite grains isolated from different-age lithotectonic complexes of Eastern Kamchatka. The investigations were carried out in areas with different geodynamic settings: in Kronotsky Peninsula which is situated in the convergence zone of the Kamchatka margin with the relatively warm and light oceanic crust of the Pacific plate with the Obruchev Rise; in the Kamchatsky Peninsula situated in the collision zone of the Komandorsky block of the Aleutian volcanic arc and the Kamchatka continental margin; and the Kumroch Range, complexes of which belong to the Ozernoy–Valagin and Vetlovsky terranes. The analysis allowed us to distinguish several exhumation events: 29.9–34.9, 19.3–24.1, 10.2–15.4, 6.2–8.6, and 3.3–5.1 Ma. The highlighted age intervals correlate well with the main tectonic events and indicate that the accretionary and collisional processes in Eastern Kamchatka continued from the Oligocene to the Late Miocene–Pliocene.