dc.date.accessioned | 2022-02-15T16:03:12Z | |
dc.date.available | 2022-02-15T16:03:12Z | |
dc.date.created | 2021-12-23T13:20:52Z | |
dc.date.issued | 2021 | |
dc.identifier.citation | Shephard, Grace Houser, Christine Hernlund, John W Valencia-Cardona, Juan J. Trønnes, Reidar G Wentzcovitch, RM . Seismological expression of the iron spin crossover in ferropericlase in the Earth’s lower mantle. Nature Communications. 2021 | |
dc.identifier.uri | http://hdl.handle.net/10852/90943 | |
dc.description.abstract | Abstract The two most abundant minerals in the Earth’s lower mantle are bridgmanite and ferropericlase. The bulk modulus of ferropericlase (Fp) softens as iron d-electrons transition from a high-spin to low-spin state, affecting the seismic compressional velocity but not the shear velocity. Here, we identify a seismological expression of the iron spin crossover in fast regions associated with cold Fp-rich subducted oceanic lithosphere: the relative abundance of fast velocities in P- and S-wave tomography models diverges in the ~1,400-2,000 km depth range. This is consistent with a reduced temperature sensitivity of P-waves throughout the iron spin crossover. A similar signal is also found in seismically slow regions below ~1,800 km, consistent with broadening and deepening of the crossover at higher temperatures. The corresponding inflection in P-wave velocity is not yet observed in 1-D seismic profiles, suggesting that the lower mantle is composed of non-uniformly distributed thermochemical heterogeneities which dampen the global signature of the Fp spin crossover. | |
dc.language | EN | |
dc.publisher | Nature Portfolio | |
dc.rights | Attribution 4.0 International | |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | |
dc.title | Seismological expression of the iron spin crossover in ferropericlase in the Earth’s lower mantle | |
dc.type | Journal article | |
dc.creator.author | Shephard, Grace | |
dc.creator.author | Houser, Christine | |
dc.creator.author | Hernlund, John W | |
dc.creator.author | Valencia-Cardona, Juan J. | |
dc.creator.author | Trønnes, Reidar G | |
dc.creator.author | Wentzcovitch, RM | |
cristin.unitcode | 185,15,22,40 | |
cristin.unitname | Senter for Jordens utvikling og dynamikk | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 2 | |
dc.identifier.cristin | 1971762 | |
dc.identifier.bibliographiccitation | info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Nature Communications&rft.volume=&rft.spage=&rft.date=2021 | |
dc.identifier.jtitle | Nature Communications | |
dc.identifier.volume | 12 | |
dc.identifier.issue | 1 | |
dc.identifier.doi | https://doi.org/10.1038/s41467-021-26115-z | |
dc.identifier.urn | URN:NBN:no-93542 | |
dc.type.document | Tidsskriftartikkel | |
dc.type.peerreviewed | Peer reviewed | |
dc.source.issn | 2041-1723 | |
dc.identifier.fulltext | Fulltext https://www.duo.uio.no/bitstream/handle/10852/90943/1/nc21-Shephard-Fp-spin-BEAMS.pdf | |
dc.type.version | PublishedVersion | |
cristin.articleid | 5905 | |
dc.relation.project | NFR/223272 | |