Petrochemical features of slab component associated with ridge subduction and ophiolite emplacement

Abstract

Investigation of slab component is of particular importance to understanding igneous activity of subduction environments. This paper describes the petrochemical features of adakitic rocks in the Kitakami Mountains and late intrusive rocks in the Oman ophiolite. Petrochemical investigation indicates that the high-Sr andesite and high-Mg andesite magma can be resulted from interaction of slab derived adakitic melt with overlying wedge mantle. On the other hand, late intrusive rocks in the Oman ophiolite are considered to be derived from slab melting under the shallow-pressure conditions.