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Polymorphic Nature of Iron and Degree of Lattice Preferred Orientation Beneath the Earth's Inner Core Boundary

Mattesini, M.; Belonoshko, A.B.; Tkalčić, Hrvoje

Description

Deciphering the polymorphic nature and the degree of iron lattice‐preferred orientation in the Earth's inner core holds a key to understanding the present status and evolution of the inner core. A multiphase lattice‐preferred orientation pattern is obtained for the top 350 km of the inner core by means of the ab initio based Candy Wrapper Velocity Model coupled to a Monte Carlo phase discrimination scheme. The achieved geographic distribution of lattice alignment is characterized by two regions...[Show more]

dc.contributor.authorMattesini, M.
dc.contributor.authorBelonoshko, A.B.
dc.contributor.authorTkalčić, Hrvoje
dc.date.accessioned2019-08-07T06:16:26Z
dc.date.available2019-08-07T06:16:26Z
dc.identifier.issn1525-2027
dc.identifier.urihttp://hdl.handle.net/1885/164918
dc.description.abstractDeciphering the polymorphic nature and the degree of iron lattice‐preferred orientation in the Earth's inner core holds a key to understanding the present status and evolution of the inner core. A multiphase lattice‐preferred orientation pattern is obtained for the top 350 km of the inner core by means of the ab initio based Candy Wrapper Velocity Model coupled to a Monte Carlo phase discrimination scheme. The achieved geographic distribution of lattice alignment is characterized by two regions of freezing, namely within South America and the Western Central Pacific, that exhibit an uncommon high degree of lattice orientation. In contrast, widespread regions of melting of relatively weak lattice ordering permeate the rest of the inner core. The obtained multiphase lattice‐preferred orientation pattern is in line with mantle‐constrained geodynamo simulations and allows to setup an ad hoc mineral physics scenario for the complex Earth's inner core. It is found that the cubic phase of iron is the dominating iron polymorph in the outermost part of the inner core.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherAmerican Geophysical Union
dc.rights© 2018. American Geophysical Union
dc.sourceGeochemistry, Geophysics, Geosystems
dc.titlePolymorphic Nature of Iron and Degree of Lattice Preferred Orientation Beneath the Earth's Inner Core Boundary
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume19
dc.date.issued2018
local.identifier.absfor040407 - Seismology and Seismic Exploration
local.identifier.absfor049999 - Earth Sciences not elsewhere classified
local.identifier.ariespublicationu5786633xPUB371
local.publisher.urlhttps://sites.agu.org/
local.type.statusPublished Version
local.contributor.affiliationMattesini, M., Universidad Complutense de Madrid
local.contributor.affiliationBelonoshko, A.B., AlbaNova University Centre
local.contributor.affiliationTkalcic, Hrvoje, College of Science, ANU
local.bibliographicCitation.issue1
local.bibliographicCitation.startpage292
local.bibliographicCitation.lastpage304
local.identifier.doi10.1002/2017GC007285
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2019-03-31T07:24:34Z
local.identifier.scopusID2-s2.0-85041060388
dcterms.accessRightsOpen Access
dc.provenancehttp://sherpa.ac.uk/romeo/issn/1525-2027/..."Publisher's version/PDF may be used 6 months after publication on an Institutional Repository or Governmental Repository only" from SHERPA/RoMEO site (as at 7/08/19).
CollectionsANU Research Publications

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