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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...

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