Nazca Plate: Crustal Formation and Andean Convergence
Sediment and associated structure of the northern Nazca plate
Published:January 01, 1981
D. L. Erlandson, D. M. Hussong, J. F. Campbell, 1981. "Sediment and associated structure of the northern Nazca plate", Nazca Plate: Crustal Formation and Andean Convergence, La Verne D. Kulm, Jack Dymond, E. Julius Dasch, Donald M. Hussong, Roxanne Roderick
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An isopach map of total sediment thickness of the Nazca plate north of 30°S latitude shows deviations from the the obvious sediment trends that are governed by crustal age, sea-floor depth, and surface biologic productivity. Sediment on the eastern flank of the East Pacific Rise has accumulated at half the rate of that on the western rise flank; this difference is attributed in part to asymmetric spreading. Broad areas of thin sediment occur over the crest of the fossil Galapagos Rise and in a 300-km-wide zone on the eastern plate margin parallel to the Peru-Chile Trench. Whereas the thin sediment...