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Peru-Chile Trench sediments and sea-floor spreading

The hypotheses of sea-floor spreading and plate tectonics require the removal of sediment from oceanic trenches either by crustal underthrusting or by folding against the base of a continental or insular margin. Accordingly, over a period of time the volume of sediment removed by way of spreading must be equal to the difference between the observable volume of undeformed terrigenous deposits in a
Authors
David W. Scholl, Mark N. Christensen, Roland E. von Huene, Michael S. Marlow