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 | |
| Publication status | Published - Nov 16 2014 |
| Externally published | Yes |
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Keywords
- majorite
- mantle convection
- phase transition
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geophysics
Cite this
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 journal › Article
}
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
UR - http://www.scopus.com/inward/record.url?scp=84912088181&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84912088181&partnerID=8YFLogxK
U2 - 10.1002/2014GL061477
DO - 10.1002/2014GL061477
M3 - Article
AN - SCOPUS:84912088181
VL - 41
SP - 7501
EP - 7507
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 21
ER -