Dredging on the island slope of the Izu Trench brought up volcanic rocks of the marianite-boninite series among fragments of the ophiolite complex. One distinguishing feature of these marianite-boninite rocks is the presence ...

Dredged samples from the Geophysicist seamount volcano in the northeastern part of the Kurile Basin include volcanic and volcanoclastic rocks ranging from basalt to andesite. The rocks have geochemical features typical of ...

The lithology of the sediments (siliceous, clayey-siliceous, graywacke, and tuffogenic deposits) of the lower Drozdovskaya Formation suggests that the lavas were erupted in a deep-sea basin (tholeiite) and on its flanks ...