Zircon record of an Archaean crustal fragment and supercontinent amalgamation in quaternary back-arc volcanic rocks.

ABSTRACT: Magmatism has profoundly influenced the evolution of the geosphere, hydrosphere, atmosphere, and biosphere in back-arc basins. However, the timing of the magmatism in the Okinawa Trough (OT) is not well constrained by the age spectra of zircons. Here, for the first time, we carry out an integrated study combining in situ analysis of zircon U-Th-Pb and Hf-O isotopes, and trace element compositions of zircons from the volcanic rocks from the southernmost part of the OT. We found that the young (< 100 ka) zircons in these volcanic rocks have old (108 Ma to 2.7 Ga) inherited cores, which were captured as the magma ascended through the rifting continental crust. In particular, the inherited Archean zircons strongly suggest that remnants of the old East Asian continental blocks underlie the embr

SUBMITTER: Zeng ZG 

PROVIDER: S-EPMC8196102 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature