Open AccessAge and sources of the metasedimrntary rocks of the Tokur terrane in the Mongol-Okhotsk fold belt: results of the U–Pb geoсhronological
and Lu–Hf isotope studies
Author(s) -
В. А. Заика,
А. А. Сорокин,
А. П. Сорокин
Publication year - 2019
Publication title -
doklady akademii nauk. rossijskaâ akademiâ nauk
Language(s) - English
Resource type - Journals
ISSN - 0869-5652
DOI - 10.31857/s0869-56524864446-450
Subject(s) - terrane , geology , craton , geochemistry , paleozoic , zircon , metamorphic rock , igneous rock , permian , accretionary wedge , fold (higher order function) , petrology , paleontology , tectonics , subduction , structural basin , engineering , mechanical engineering
This paper presents the results of U–Pb (LA–ICP–MS) and Lu–Hf isotope studies of detrital zircons from metasedimentary rocks of the Tokur Terrane. It has been shown that metasedimentary rocks of the Tokur and Ekimchan formations are characterized by similar age peaks of detrital zircons, which indicates a close (or same) age of these formations. The lower age of the sedimentation is determined by the age of the youngest zircons of 326–323 Ma. The upper age boundary is determined of 254–251 Ma, based on the intruded of the Late Permian granitoids. The main sources of zircons in the metasedimentary rocks of the Tokur Terrane are the igneous and metamorphic complexes of the southeast framing of the North Asia Craton. The Tokur Terrane can be considered as a fragment of the Paleozoic accretionary complex, the formation in front of the southeastern margin of the North Asia Craton.