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Understanding Earth's lower mantle requires putting recent seismic and mineral physics discoveries into a self-consistent, geodynamically feasible context. Two nearly antipodal large low-shear-velocity provinces in the deep mantle likely represent chemically distinct and denser material. High-resolution seismological studies have revealed laterally varying seismic velocity discontinuities in the deepest few hundred kilometers, consistent with a phase transition from perovskite to post-perovskite. In the deepest tens of kilometers of the mantle, isolated pockets of ultralow seismic velocities may denote Earth's deepest magma chamber.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380011142939736832","@type":"Researcher","foaf:name":[{"@value":"Edward J. 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McNamara"}],"jpcoar:affiliationName":[{"@value":"School of Earth and Space Exploration, Arizona State University, Box 871404, Tempe, AZ 85287, USA."}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00368075"},{"@type":"EISSN","@value":"10959203"}],"prism:publicationName":[{"@value":"Science"}],"dc:publisher":[{"@value":"American Association for the Advancement of Science (AAAS)"}],"prism:publicationDate":"2008-05-02","prism:volume":"320","prism:number":"5876","prism:startingPage":"626","prism:endingPage":"628"},"reviewed":"false","url":[{"@id":"https://www.science.org/doi/pdf/10.1126/science.1148028"}],"createdAt":"2008-05-02","modifiedAt":"2024-01-10","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050287540562306176","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Spin Transition of Iron in δ‐(Al,Fe)OOH Induces Thermal Anomalies in Earth's Lower 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