Composite Structure of the Oceanic Plate Beneath the Ontong Java Plateau Revealed by Seismic Waves (IMAGE)
Caption
Schematic illustration of the oceanic plate beneath the Ontong Java Plateau inferred from seismic wave analyses.
High-frequency seismic observations indicate that the plate has a composite structure in which horizontally layered formations are intersected by vertically intruded dike swarms. These structures formed as magma derived from a thermochemical mantle plume ascended through the plate, causing chemical modification (refertilization) of the oceanic lithosphere.
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© せき・らんうん
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