THE LATE MESOZOIC MAGMATIC EVOLUTION OF DALAT ZONE

Abstract

The Late Mesozoic igneous rocks of Da Lat Zone include variety of rocks of which composition ranges from mafic (even Fe-ultramafic) to very felsic one. Among them, a small part is product of non-differentiation magmatism and the rest is mainly of a differentiation crystallization process. The Late Mesozoic igneous rocks of Da Lat Zone are derived from enriched mantle at different grades, characterized by isotopic geochemistry and petrochemistry. The Da Lat Zone magmatism is product of active continental margin of Paleo East Asian type in which there exist at the same time compression due to subduction and extension upon magmatic arc.