Influence of majorite on hot plumes

Hiroki Ichikawa, Masanori Kameyama, Hiroki Senshu, Kenji Kawai, Shigenori Maruyama

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The influence of MgSiO3 majorite on mantle convection has been investigated via 2-D numerical simulations that incorporate the stability field of majorite. According to a recent first principles study, wadsleyite decomposes into an assemblage of majorite plus periclase with a large negative Clapeyron slope. Since the stability field of majorite is limited to be greater than ~2200 K in a depth range of 500-660 km for Mg2SiO4, very hot upwelling plumes are expected to be strongly influenced by the phase transitions related to majorite. These hot upwellings are occasionally observed in simulations, even though the average temperature of hot plumes is far less than the stability field of majorite. The dynamics of these upwellings are controlled by the release and the absorption of latent heat induced by majorite's phase transitions as well as by the interruption of currents due to the large negative Clapeyron slope related to majorite. Key Points We find strongly heated hot plumes when temperature of mantle is highHot plumes in Archean could be affected by transitions related to majoriteHigh temperature plumes intermittently form at the present mantle temperature

Original languageEnglish
Pages (from-to)7501-7507
Number of pages7
JournalGeophysical Research Letters
Volume41
Issue number21
DOIs
Publication statusPublished - Nov 16 2014
Externally publishedYes

Fingerprint

majorite
plumes
plume
upwelling water
Earth mantle
upwelling
periclase
slopes
phase transition
temperature
interruption
latent heat
wadsleyite
mantle
convection
simulation
mantle convection
Archean

Keywords

  • majorite
  • mantle convection
  • phase transition

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Geophysics

Cite this

Ichikawa, H., Kameyama, M., Senshu, H., Kawai, K., & Maruyama, S. (2014). Influence of majorite on hot plumes. Geophysical Research Letters, 41(21), 7501-7507. https://doi.org/10.1002/2014GL061477

Influence of majorite on hot plumes. / Ichikawa, Hiroki; Kameyama, Masanori; Senshu, Hiroki; Kawai, Kenji; Maruyama, Shigenori.

In: Geophysical Research Letters, Vol. 41, No. 21, 16.11.2014, p. 7501-7507.

Research output: Contribution to journalArticle

Ichikawa, H, Kameyama, M, Senshu, H, Kawai, K & Maruyama, S 2014, 'Influence of majorite on hot plumes', Geophysical Research Letters, vol. 41, no. 21, pp. 7501-7507. https://doi.org/10.1002/2014GL061477
Ichikawa H, Kameyama M, Senshu H, Kawai K, Maruyama S. Influence of majorite on hot plumes. Geophysical Research Letters. 2014 Nov 16;41(21):7501-7507. https://doi.org/10.1002/2014GL061477
Ichikawa, Hiroki ; Kameyama, Masanori ; Senshu, Hiroki ; Kawai, Kenji ; Maruyama, Shigenori. / Influence of majorite on hot plumes. In: Geophysical Research Letters. 2014 ; Vol. 41, No. 21. pp. 7501-7507.
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