Density of basaltic melt at high pressure and stability of the melt at the base of the lower mantle

Eiji Ohtani; Makoto Maeda

doi:10.1016/S0012-821X(01)00505-2

Density of basaltic melt at high pressure and stability of the melt at the base of the lower mantle

Eiji Ohtani, Makoto Maeda

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

154 Citations (Scopus)

Abstract

We made density measurements of model MORB and picritic melts up to about 15 GPa using the floating diamond method. The compression behavior of the melts is fitted by the Vinet equation of state and extrapolated to higher pressure. A density crossover between the MORB melt and the mantle peridotite is suggested at the base of the lower mantle. Thus, the ultra-low velocity zone in the D″ layer may be explained by the existence of gravitationally stabilized basaltic melt formed by melting of the accumulated slab materials. This region might become unstable due to progressive melting of slab materials and/or supply of volatiles.

Original language	English
Pages (from-to)	69-75
Number of pages	7
Journal	Earth and Planetary Science Letters
Volume	193
Issue number	1-2
DOIs	https://doi.org/10.1016/S0012-821X(01)00505-2
Publication status	Published - 2001
Externally published	Yes

Keywords

Basaltic composition
D layer
Density
Equations of state
Low-velocity zones
Melts
Mid-ocean ridge basalts
Picrite

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology
Earth and Planetary Sciences (miscellaneous)
Space and Planetary Science

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10.1016/S0012-821X(01)00505-2

Cite this

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title = "Density of basaltic melt at high pressure and stability of the melt at the base of the lower mantle",

abstract = "We made density measurements of model MORB and picritic melts up to about 15 GPa using the floating diamond method. The compression behavior of the melts is fitted by the Vinet equation of state and extrapolated to higher pressure. A density crossover between the MORB melt and the mantle peridotite is suggested at the base of the lower mantle. Thus, the ultra-low velocity zone in the D″ layer may be explained by the existence of gravitationally stabilized basaltic melt formed by melting of the accumulated slab materials. This region might become unstable due to progressive melting of slab materials and/or supply of volatiles.",

keywords = "Basaltic composition, D layer, Density, Equations of state, Low-velocity zones, Melts, Mid-ocean ridge basalts, Picrite",

author = "Eiji Ohtani and Makoto Maeda",

note = "Funding Information: The authors appreciate A. Suzuki for technical assistance of the experiments and discussions on the manuscript, and T. Kondo for valuable discussion throughout this work. We appreciate C.B. Agee and P. Richet for constructive review of the manuscript. This work was partially supported by Grant-in-Aid for Scientific Research A (No. 09394951) and Scientific Research on Priority Area B (No. 12126291) of the Ministry of Education, Science, and Culture of the Japanese government to E.O. [BW]",

year = "2001",

doi = "10.1016/S0012-821X(01)00505-2",

language = "English",

volume = "193",

pages = "69--75",

journal = "Earth and Planetary Sciences Letters",

issn = "0012-821X",

publisher = "Elsevier",

number = "1-2",

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TY - JOUR

T1 - Density of basaltic melt at high pressure and stability of the melt at the base of the lower mantle

AU - Ohtani, Eiji

AU - Maeda, Makoto

N1 - Funding Information: The authors appreciate A. Suzuki for technical assistance of the experiments and discussions on the manuscript, and T. Kondo for valuable discussion throughout this work. We appreciate C.B. Agee and P. Richet for constructive review of the manuscript. This work was partially supported by Grant-in-Aid for Scientific Research A (No. 09394951) and Scientific Research on Priority Area B (No. 12126291) of the Ministry of Education, Science, and Culture of the Japanese government to E.O. [BW]

PY - 2001

Y1 - 2001

N2 - We made density measurements of model MORB and picritic melts up to about 15 GPa using the floating diamond method. The compression behavior of the melts is fitted by the Vinet equation of state and extrapolated to higher pressure. A density crossover between the MORB melt and the mantle peridotite is suggested at the base of the lower mantle. Thus, the ultra-low velocity zone in the D″ layer may be explained by the existence of gravitationally stabilized basaltic melt formed by melting of the accumulated slab materials. This region might become unstable due to progressive melting of slab materials and/or supply of volatiles.

AB - We made density measurements of model MORB and picritic melts up to about 15 GPa using the floating diamond method. The compression behavior of the melts is fitted by the Vinet equation of state and extrapolated to higher pressure. A density crossover between the MORB melt and the mantle peridotite is suggested at the base of the lower mantle. Thus, the ultra-low velocity zone in the D″ layer may be explained by the existence of gravitationally stabilized basaltic melt formed by melting of the accumulated slab materials. This region might become unstable due to progressive melting of slab materials and/or supply of volatiles.

KW - Basaltic composition

KW - D layer

KW - Density

KW - Equations of state

KW - Low-velocity zones

KW - Melts

KW - Mid-ocean ridge basalts

KW - Picrite

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U2 - 10.1016/S0012-821X(01)00505-2

DO - 10.1016/S0012-821X(01)00505-2

M3 - Article

AN - SCOPUS:0035655742

SN - 0012-821X

VL - 193

SP - 69

EP - 75

JO - Earth and Planetary Sciences Letters

JF - Earth and Planetary Sciences Letters

IS - 1-2

ER -

Density of basaltic melt at high pressure and stability of the melt at the base of the lower mantle

Abstract

Keywords

ASJC Scopus subject areas

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