Influence of majorite on hot plumes

被引：6

作者：

Ichikawa, Hiroki ^{[1
,2
]}

Kameyama, Masanori ^{[1
]}

Senshu, Hiroki ^{[3
]}

Kawai, Kenji ^{[4
]}

Maruyama, Shigenori ^{[2
]}

机构：

[1] Ehime Univ, Geodynam Res Ctr, Matsuyama, Ehime, Japan

[2] Tokyo Inst Technol, Earth Life Sci Inst, Meguro Ku, Tokyo 152, Japan

[3] Chiba Inst Technol, Planetary Explorat Res Ctr, Narashino, Chiba 275, Japan

[4] Univ Tokyo, Grad Sch Arts & Sci, Meguro Ku, Tokyo, Japan

来源：

GEOPHYSICAL RESEARCH LETTERS | 2014年 / 41卷 / 21期

关键词：

3-DIMENSIONAL MANTLE CONVECTION; SYSTEM MG4SI4O12-MG3AL2SI3O12; PHASE-TRANSITIONS; ARCHEAN MANTLE; PEROVSKITE; TEMPERATURE; GARNET; ILMENITE; EARTH; MODEL;

D O I：

10.1002/2014GL061477

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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 similar to 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.

引用

页码：7501 / 7507

页数：7

共 24 条

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