BASALTS OF THE ERDAGOU FORMATION AND ITS GEODYNAMIC SETTING IN THE TAUKHA TERRANE, SOUTHERN SIKHOTE-ALIN, PRIMORYE

Abstract

This paper discusses the petrography, petrochemistry and geochemistry of basalts of the Erdagou volcanic-cherty Formation in the Taukha terrane, Southern Sikhote-Alin. The mid-Jurassic (Callovian) age of the basalts is based on the radiolarian dating from associated cherts. The geochemical features both of N-type mid-oceanic ridge basalts and island arc tholeiites are characteristic of the examined rocks. It is assumed that these volcanic rocks were formed under backarc spreading conditions, but not under open-ocean ones.