Spin transition zone in Earth's lower mantle

Jung Fu Lin*, György Vankó, Steven D. Jacobsen, Valentin Iota, Viktor V. Struzhkin, Vitali B. Prakapenka, Alexei Kuznetsov, Choong Shik Yoo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

166 Scopus citations

Abstract

Mineral properties in Earth's lower mantle are affected by iron electronic states, but representative pressures and temperatures have not yet been probed. Spin states of iron in lower-mantle ferropericlase have been measured up to 95 gigapascals and 2000 kelvin with x-ray emission in a laser-heated diamond cell. A gradual spin transition of iron occurs over a pressure-temperature range extending from about 1000 kilometers in depth and 1900 kelvin to 2200 kilometers and 2300 kelvin in the lower mantle. Because low-spin ferropericlase exhibits higher density and faster sound velocities relative to the high-spin ferropericlase, the observed increase in low-spin (Mg,Fe)O at mid-lower mantle conditions would manifest seismically as a lower-mantle spin transition zone characterized by a steeper-thannormal density gradient.

Original languageEnglish (US)
Pages (from-to)1740-1743
Number of pages4
JournalScience
Volume317
Issue number5845
DOIs
StatePublished - Sep 21 2007

ASJC Scopus subject areas

  • General

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