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Leg 21 was the first leg of the project to drill a sequence of deep-sea cores along a line of section that crosses an active volcanic arc-trench system, continues across a series of marginal ocean basins and ridges, and then extends onto a continental margin platform. Not surprisingly, abundant volcanic rocks and sediments rich in volcanic components were penetrated; these include several lithologies not previously found in deep-sea drilling. This report briefly describes the volcanic constituents found in each hole, correlates them between the holes, and finally makes a preliminary interpretation of their source and significance in the volcanic and tectonic history of the region.

Volcanic Rocks and Volcanic Constituents in Sediments, Leg 21, Deep Sea Drilling Project