Sr–Nd isotopic compositions of the Susuma–Nagaho Plutonic Complex in the San–yo Belt, Southwest Japan: Implications for the Cretaceous enriched mantle

The Inner Zone of Southwest Japan is dominated by voluminous Cretaceous to Paleogene igneous rocks. The central part of Yamaguchi Prefecture, in the Susuma–Nagaho area, displays a dominance of the Susuma–Nagaho Plutonic Complex that consists of granodiorite and gabbro. The gabbro can be subdivided into fine–grained gabbro and coarse–grained cumulus gabbro. The fine–grained gabbro has a high Mg–number similar to primitive basalt with negative εNd...