Aluminium control of argon solubility in silicate melts under pressure

M. Ali Bouhifd, Andrew P. Jephcoat

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Understanding of the crystal chemistry of the Earth's deep mantle has evolved rapidly recently with the gradual acceptance of the importance of the effect of minor elements such as aluminium on the properties of major phases such as perovskite1-3. In the early Earth, during its formation and segregation into rocky mantle and iron-rich core, it is likely that silicate liquids played a large part in the transport of volatiles to or from the deep interior. The importance of aluminium on solubility mechanisms at high pressure has so far received little attention, even though aluminium has long been recognized as exerting strong control on liquid structures at ambient conditions4-6. Here we present constraints on the solubility of argon in aluminosilicate melt compositions up to 25 GPa and 3,000 K, using a laser-heated diamond-anvil cell. The argon contents reach a maximum that persists to pressures as high as 17 GPa (up to 500 km deep in an early magma ocean), well above that expected on the basis of Al-free melt experiments. A distinct drop in argon solubility observed over a narrow pressure range correlates well with the expected void loss in the melt structure predicted by recent molecular dynamics simulations7-9. These results provide a process for noble gas sequestration in the mantle at various depths in a cooling magma ocean. The concept of shallow partial melting as a unique process for extracting noble gases from the early Earth, thereby defining the initial atmospheric abundance, may therefore be oversimplified.

Original languageEnglish
Pages (from-to)961-964
Number of pages4
JournalNature
Volume439
Issue number7079
DOIs
Publication statusPublished - Feb 23 2006
Externally publishedYes

Fingerprint

Silicates
Argon
Aluminum
Solubility
Noble Gases
Pressure
Oceans and Seas
Diamond
Molecular Dynamics Simulation
Freezing
Lasers
Iron

ASJC Scopus subject areas

  • General

Cite this

Aluminium control of argon solubility in silicate melts under pressure. / Bouhifd, M. Ali; Jephcoat, Andrew P.

In: Nature, Vol. 439, No. 7079, 23.02.2006, p. 961-964.

Research output: Contribution to journalArticle

Bouhifd, M. Ali ; Jephcoat, Andrew P. / Aluminium control of argon solubility in silicate melts under pressure. In: Nature. 2006 ; Vol. 439, No. 7079. pp. 961-964.
@article{08ac553775fe473b9c0a53cbbd9cad85,
title = "Aluminium control of argon solubility in silicate melts under pressure",
abstract = "Understanding of the crystal chemistry of the Earth's deep mantle has evolved rapidly recently with the gradual acceptance of the importance of the effect of minor elements such as aluminium on the properties of major phases such as perovskite1-3. In the early Earth, during its formation and segregation into rocky mantle and iron-rich core, it is likely that silicate liquids played a large part in the transport of volatiles to or from the deep interior. The importance of aluminium on solubility mechanisms at high pressure has so far received little attention, even though aluminium has long been recognized as exerting strong control on liquid structures at ambient conditions4-6. Here we present constraints on the solubility of argon in aluminosilicate melt compositions up to 25 GPa and 3,000 K, using a laser-heated diamond-anvil cell. The argon contents reach a maximum that persists to pressures as high as 17 GPa (up to 500 km deep in an early magma ocean), well above that expected on the basis of Al-free melt experiments. A distinct drop in argon solubility observed over a narrow pressure range correlates well with the expected void loss in the melt structure predicted by recent molecular dynamics simulations7-9. These results provide a process for noble gas sequestration in the mantle at various depths in a cooling magma ocean. The concept of shallow partial melting as a unique process for extracting noble gases from the early Earth, thereby defining the initial atmospheric abundance, may therefore be oversimplified.",
author = "Bouhifd, {M. Ali} and Jephcoat, {Andrew P.}",
year = "2006",
month = "2",
day = "23",
doi = "10.1038/nature04583",
language = "English",
volume = "439",
pages = "961--964",
journal = "Nature",
issn = "0028-0836",
publisher = "Nature Publishing Group",
number = "7079",

}

TY - JOUR

T1 - Aluminium control of argon solubility in silicate melts under pressure

AU - Bouhifd, M. Ali

AU - Jephcoat, Andrew P.

PY - 2006/2/23

Y1 - 2006/2/23

N2 - Understanding of the crystal chemistry of the Earth's deep mantle has evolved rapidly recently with the gradual acceptance of the importance of the effect of minor elements such as aluminium on the properties of major phases such as perovskite1-3. In the early Earth, during its formation and segregation into rocky mantle and iron-rich core, it is likely that silicate liquids played a large part in the transport of volatiles to or from the deep interior. The importance of aluminium on solubility mechanisms at high pressure has so far received little attention, even though aluminium has long been recognized as exerting strong control on liquid structures at ambient conditions4-6. Here we present constraints on the solubility of argon in aluminosilicate melt compositions up to 25 GPa and 3,000 K, using a laser-heated diamond-anvil cell. The argon contents reach a maximum that persists to pressures as high as 17 GPa (up to 500 km deep in an early magma ocean), well above that expected on the basis of Al-free melt experiments. A distinct drop in argon solubility observed over a narrow pressure range correlates well with the expected void loss in the melt structure predicted by recent molecular dynamics simulations7-9. These results provide a process for noble gas sequestration in the mantle at various depths in a cooling magma ocean. The concept of shallow partial melting as a unique process for extracting noble gases from the early Earth, thereby defining the initial atmospheric abundance, may therefore be oversimplified.

AB - Understanding of the crystal chemistry of the Earth's deep mantle has evolved rapidly recently with the gradual acceptance of the importance of the effect of minor elements such as aluminium on the properties of major phases such as perovskite1-3. In the early Earth, during its formation and segregation into rocky mantle and iron-rich core, it is likely that silicate liquids played a large part in the transport of volatiles to or from the deep interior. The importance of aluminium on solubility mechanisms at high pressure has so far received little attention, even though aluminium has long been recognized as exerting strong control on liquid structures at ambient conditions4-6. Here we present constraints on the solubility of argon in aluminosilicate melt compositions up to 25 GPa and 3,000 K, using a laser-heated diamond-anvil cell. The argon contents reach a maximum that persists to pressures as high as 17 GPa (up to 500 km deep in an early magma ocean), well above that expected on the basis of Al-free melt experiments. A distinct drop in argon solubility observed over a narrow pressure range correlates well with the expected void loss in the melt structure predicted by recent molecular dynamics simulations7-9. These results provide a process for noble gas sequestration in the mantle at various depths in a cooling magma ocean. The concept of shallow partial melting as a unique process for extracting noble gases from the early Earth, thereby defining the initial atmospheric abundance, may therefore be oversimplified.

UR - http://www.scopus.com/inward/record.url?scp=33644513415&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33644513415&partnerID=8YFLogxK

U2 - 10.1038/nature04583

DO - 10.1038/nature04583

M3 - Article

VL - 439

SP - 961

EP - 964

JO - Nature

JF - Nature

SN - 0028-0836

IS - 7079

ER -