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Polymorphic Nature of Iron and Degree of Lattice Preferred Orientation Beneath the Earth's Inner Core Boundary
KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.ORCID iD: 0000-0001-7531-3210
2018 (English)In: Geochemistry Geophysics Geosystems, ISSN 1525-2027, E-ISSN 1525-2027, Vol. 19, no 1, p. 292-304Article in journal (Refereed) Published
Abstract [en]

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 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.

Place, publisher, year, edition, pages
AMER GEOPHYSICAL UNION , 2018. Vol. 19, no 1, p. 292-304
Keyword [en]
earth's inner core, lattice-preferred orientation, iron polymorphs
National Category
Geophysics
Identifiers
URN: urn:nbn:se:kth:diva-224071DOI: 10.1002/2017GC007285ISI: 000425633500016Scopus ID: 2-s2.0-85041060388OAI: oai:DiVA.org:kth-224071DiVA, id: diva2:1190495
Note

QC 20180314

Available from: 2018-03-14 Created: 2018-03-14 Last updated: 2018-03-14Bibliographically approved

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Belonoshko, Anatoly

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