Influence of majorite on hot plumes

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

doi:10.1002/2014GL061477

Influence of majorite on hot plumes

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

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	7501-7507
Number of pages	7
Journal	Geophysical Research Letters
Volume	41
Issue number	21
DOIs	https://doi.org/10.1002/2014GL061477
Publication status	Published - Nov 16 2014

Keywords

majorite
mantle convection
phase transition

ASJC Scopus subject areas

Geophysics
Earth and Planetary Sciences(all)

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10.1002/2014GL061477

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title = "Influence of majorite on hot plumes",

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",

keywords = "majorite, mantle convection, phase transition",

author = "Hiroki Ichikawa and Masanori Kameyama and Hiroki Senshu and Kenji Kawai and Shigenori Maruyama",

year = "2014",

month = nov,

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doi = "10.1002/2014GL061477",

language = "English",

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pages = "7501--7507",

journal = "Geophysical Research Letters",

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TY - JOUR

T1 - Influence of majorite on hot plumes

AU - Ichikawa, Hiroki

AU - Kameyama, Masanori

AU - Senshu, Hiroki

AU - Kawai, Kenji

AU - Maruyama, Shigenori

PY - 2014/11/16

Y1 - 2014/11/16

N2 - 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

AB - 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

KW - majorite

KW - mantle convection

KW - phase transition

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