The petrochemical method for recognizing geodynamic formation settings of igneous rocks (Shmidt Terrane, Sakhalin)

The igneous rocks of Sakhalin are believed to have been formed in different magma generating structures of the oceanic, oceanicmarine, island arc, and con tinental rift settings [1]. It appears that the factor dia gram [2] used for their differentiation bears a signifi cant empirical error (approximately 30%) in recogniz ing of the tectonic position of basalts. Moreover, over 70% of data points for such intraplate basalts and approximately 22% of them characterizing basalts from continental rifts appear to correspond to the island arc field.