6:15 PM - 7:30 PM
[SGL40-P03] Provenance analysis of Jurassic-Cretaceous formations in Japan using etrital-zircon-age spectra
Keywords:detrital zircon, U-Pb age, East Asia, Jurassic, Cretaceous, tectonics
From the Triassic, the northeastern margin of Pangea or Laurasia changed to a large igneous province and the provenance analysis with detrital-zircon-age distribution become more difficult. However, compilation of the zircon U-Pb ages of igneous rocks in (present-day) East Asia has revealed certain provinciality at the age of igneous rock bodies. On the other hand, we made classification of Jurassic-Cretaceous geologic units in Japan from a simple verification of the similarity in detrital-zircon-age distribution. By comparison of a certain detrital-zircon-age spectrum with the age-distribution of igneous rock bodies in East Asia, we induced the provenance that could make the age spectrum. Moreover, we induced relative displacements of geologic bodies from the analysis of provenance transition of each geologic belt or stratigraphic succession.
Ikeda et al. (2015 JpGU) presented preliminary results of our study. In the postr presentation, we will introduce and discuss the detailed results.