The petrology and geochemistry of a metabasite belt along the southern margin of Alaska

► Detailed petrologic study of a metabasite belt using different modern tools. ► Heterogeneities of pressure in the belt. ► Rare earth and trace element patterns are comparable to altered basalt patterns. ► Subduction of a high relief under the Chugach terrane. ► Geochemistry data suggest an intra-oceanic island arc origin.