Elasticity of davemaoite as a primary contributor to lower-mantle heterogeneities
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2025-11-27
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Journal Article
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Abstract
Geophysical detection of subducted mid–ocean ridge basalt (morb) in the lower mantle is hindered by uncertainties in the elasticity of Fe,Al,mg,Ti–bearing davemaoite, a key morb component. Using brillouin spectroscopy and x-ray diffraction, we determined the elasticity of a Ca0.906(1)Fe2+0.027(1)Fe3+0.042(1) mg0.033(1)Al0.072(1)Ti0.020(1)Si0.912(1)o3 davemaoite up to 113 gigapascals and 2294 K. We found that it exhibited a shear wave velocity 10 to 20% slower than end-member davemaoite, making it the slowest phase among major lower-mantle minerals. our models show that morb, containing 20 to 25 volume percent davemaoite, potentially contributes to large low-shear-velocity provinces (LLSvPs), whereas a cumulate layer enriched in davemaoite crystallized from basal magma ocean may comprise ultralow-velocity zones (ULvZs). Davemaoite’s ability to host incompatible and heat-producing elements possibly links LLSvPs and ULvZs to mantle plume initiation and geochemical signatures of ocean island basalts.
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390 (6776)
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935 - 939
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AAAS
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09495 - Murakami, Motohiko / Murakami, Motohiko