Kilometer-scale structure on the core-mantle boundary near hawaii

HIGHLIGHTS

SUMMARY

Unlike earlier studies, which suggested ULVZs represented small-scale structures, these new observations indicate the presence of thin but wide ULVZs, on the order of 600-900 km across. Increasing evidence suggests that the correlation between the geographic location of mega-ULVZs and surface hotspots may not be a coincidence, i.e. the isotopic tungsten anomalies collected in various ocean island basalts indicate a primordial material or signatures from core infiltration in the mantle plume15,16. The travel-time delays of Sdiff postcursors hold information on the size, shape, and average velocity reduction of . . .

 



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