Pelagic and hemipelagic sediments of the Izu-Bonin region, Leg 126: geochemical and compositional features

Abstract

Chemical analyses were performed on major, minor, and rare-earth elements. The chemical compostion of this arc is highly affected by the chemical composition of rocks of this arc as a source of sediments. The Oligocene sediments, which are characterised by high MgO contents, reflect the chemical composition of the Paleogene volcanic rocks of the immature arc. The sedimentation rates and topography of the sedimentary basin affect the MnO and SiO2 contents of pelagic and hemipelagic sediments. -from Authors