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A large-scale mantle compositional discontinuity was identified along the East Pacific Rise (EPR) and the Pacific–Antarctic Ridge (PAR) with an inferred transition located at the EPR 23°S–32°S. Because of the EPR–Easter hotspot interactions in this area, the nature of this geochemical discontinuity remains unclear. IODP Sites U1367 and U1368 drilled into the ocean crust that was accreted at ∼33.5...
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