Chemical composition of the green rocks in the Nedamo Terrane, Northeast Japan

Abstract

The Nedamo Complex, an Early Carboniferous accretionary complex, contains green rocks of Late Devonian age. The complex consists of two lithotectonic units: the Takinosawa Unit and Tsunatori Unit. We analyzed the chemical composition of the green rocks in both units, as this has yet to be done for the Takinosawa Unit, and has only been done for some of the green rocks of the Tsunatori Unit. The chemical composition of green rocks in the Takinosawa Unit shows features of phyric within-plate tholeiite that in the Tsunatori Unit shows features of phyric alkali basalt, phyric within-plate tholeiite, and aphyric MORB. Fig.. Index map showing the location of the Nedamo Terranesimplified from Kawamura et al., 1996 .