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dc.contributor.authorShang, Xuefeng
dc.contributor.authorShim, Sang-Heon
dc.contributor.authorde Hoop, Maarten
dc.contributor.authorvan der Hilst, Robert D
dc.date.accessioned2014-09-24T19:48:35Z
dc.date.available2014-09-24T19:48:35Z
dc.date.issued2014-02
dc.date.submitted2013-07
dc.identifier.issn0027-8424
dc.identifier.issn1091-6490
dc.identifier.urihttp://hdl.handle.net/1721.1/90329
dc.description.abstractThe modern view of Earth’s lowermost mantle considers a D″ region of enhanced (seismologically inferred) heterogeneity bounded by the core–mantle boundary and an interface some 150–300 km above it, with the latter often attributed to the postperovskite phase transition (in MgSiO[subscript 3]). Seismic exploration of Earth’s deep interior suggests, however, that this view needs modification. So-called ScS and SKKS waves, which probe the lowermost mantle from above and below, respectively, reveal multiple reflectors beneath Central America and East Asia, two areas known for subduction of oceanic plates deep into Earth’s mantle. This observation is inconsistent with expectations from a thermal response of a single isochemical postperovskite transition, but some of the newly observed structures can be explained with postperovskite transitions in differentiated slab materials. Our results imply that the lowermost mantle is more complex than hitherto thought and that interfaces and compositional heterogeneity occur beyond the D″ region sensu stricto.en_US
dc.language.isoen_US
dc.publisherNational Academy of Sciences (U.S.)en_US
dc.relation.isversionofhttp://dx.doi.org/10.1073/pnas.1312647111en_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourceNational Academy of Sciences (U.S.)en_US
dc.titleMultiple seismic reflectors in Earth's lowermost mantleen_US
dc.typeArticleen_US
dc.identifier.citationShang, X., S.-H. Shim, M. de Hoop, and R. van der Hilst. “Multiple Seismic Reflectors in Earth’s Lowermost Mantle.” Proceedings of the National Academy of Sciences 111, no. 7 (February 3, 2014): 2442–2446.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciencesen_US
dc.contributor.mitauthorShang, Xuefengen_US
dc.contributor.mitauthorvan der Hilst, Robert D.en_US
dc.relation.journalProceedings of the National Academy of Sciencesen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsShang, X.; Shim, S.-H.; de Hoop, M.; van der Hilst, R.en_US
dc.identifier.orcidhttps://orcid.org/0000-0003-1650-6818
mit.licensePUBLISHER_POLICYen_US
mit.metadata.statusComplete


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