Abstract
Various volcanoclastic and sedimentary rocks were dredged from southern part of the Mariana Trench by 17th cruise of R/V D. Mendeleev. Clay mineralogical investigation of seventeen samples made clear the presence of abundant montmorillonite and a trace of chlorite. Phillipsite is the most abundant zeolite. Clinoptilolite and chabazite are also recognized.
Occurrences of montmorillonite and phillipsite from deep sea sediments of the Pacific Ocean have been well established.
