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Volcanic sandstones were recovered from sites along seamount chains in the North Pacific. Three different modes of origin are proposed for them. The well-rounded, commonly weathered basalt sand and fine gravel from Köko Guyot in the southern part of the Emperor Seamount chain is accompanied by whole and abraded shallow-water fossils, and is epiclastic, reworked at shallow depths. The fine, angular altered hyaloclastite sand from a submarine eruption of the Hawaiian Ridge west of Midway Islands is of turbidity current origin and helped to build an archipelagic apron. The third site, among seamounts and guyots at the east end of the Mid-Pacific Mountains, has volcanic-bearing sediments of mixed texture, composition, and origin: partially epiclastic, partly hyaloclastic, and partly pyroclastic, and largely emplaced by turbidity currents that ponded between the volcanoes. The three types of sediment have had diagenetic histories that reflect, among other factors, their textures, glass, and carbonate content.

Origin and Diagenesis of Volcanic-Rich Sediments from North Pacific Seamounts, DSDP Leg 32