The Lehmann Discontinuity Due to Dehydration of Subducted Sediment

摘要

Recent high-pressure experiments have led to the conclusion that water release from subducted sediments lyingunder continents in subduction regions occurs at about 220 km depth. This dehydration reaction is in good agreement withthe seismological signature of the discontinuity indicating that sediment dehydration causes the Lehmann discontinuity inthe upper mantle.