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Redox state, microstructure and viscosity of a partially crystallized basalt melt

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Title: Redox state, microstructure and viscosity of a partially crystallized basalt melt
Authors: Bouhifd, M. Ali1,2, Richet, Pascal1 richet@ipgp.jussieu.fr, Besson, Pascale2, Roskosz, Mathieu1,3, Ingrin, Jannick4
Source: Earth & Planetary Science Letters. Jan2004, Vol. 218 Issue 1/2, p31. 14p.
Subjects: Microstructure, Viscosity, Basalt, Glass transition temperature
Abstract: As measured in air above the glass transition range, the viscosity of an alkali basalt increases markedly with time by about two orders of magnitude in 12 h. This effect is essentially physical and due to the presence of microcrystals although partial crystallization of the melt into spinel and an SiO2-poor pyroxene leads to a considerable enrichment in silica of the residual liquid. Partial crystallization depends strongly on the initial redox state of samples in that the presence of ferrous iron is required for spinel crystals to form and for pyroxene to nucleate and grow around them. Other measurements show that the viscosity of the crystal-free liquid decreases slightly with increasing ratios r=Fe2+/∑Fe because the differences between samples with r=0.16 and 0.83 amount to about 1.5 and 0.3 log-units at 950 and 1400 K, respectively. Comparisons of the viscosities of the residual liquid matrix and of the initially crystal-free basalt show that physical effects caused by the presence of microcrystals begin to be observed at a low crystal fraction of 5 vol%. Finally, a model of viscosity calculation is developed for the melts which reproduces all data obtained in this work to better than 10%. [Copyright &y& Elsevier]
Copyright of Earth & Planetary Science Letters is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 11958409
AccessLevel: 6
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PubTypeId: academicJournal
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  Data: Redox state, microstructure and viscosity of a partially crystallized basalt melt
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  Data: <searchLink fieldCode="AR" term="%22Bouhifd%2C+M%2E+Ali%22">Bouhifd, M. Ali</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Richet%2C+Pascal%22">Richet, Pascal</searchLink><relatesTo>1</relatesTo><i> richet@ipgp.jussieu.fr</i><br /><searchLink fieldCode="AR" term="%22Besson%2C+Pascale%22">Besson, Pascale</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Roskosz%2C+Mathieu%22">Roskosz, Mathieu</searchLink><relatesTo>1,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Ingrin%2C+Jannick%22">Ingrin, Jannick</searchLink><relatesTo>4</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Earth+%26+Planetary+Science+Letters%22">Earth & Planetary Science Letters</searchLink>. Jan2004, Vol. 218 Issue 1/2, p31. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Viscosity%22">Viscosity</searchLink><br /><searchLink fieldCode="DE" term="%22Basalt%22">Basalt</searchLink><br /><searchLink fieldCode="DE" term="%22Glass+transition+temperature%22">Glass transition temperature</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: As measured in air above the glass transition range, the viscosity of an alkali basalt increases markedly with time by about two orders of magnitude in 12 h. This effect is essentially physical and due to the presence of microcrystals although partial crystallization of the melt into spinel and an SiO2-poor pyroxene leads to a considerable enrichment in silica of the residual liquid. Partial crystallization depends strongly on the initial redox state of samples in that the presence of ferrous iron is required for spinel crystals to form and for pyroxene to nucleate and grow around them. Other measurements show that the viscosity of the crystal-free liquid decreases slightly with increasing ratios r=Fe2+/∑Fe because the differences between samples with r=0.16 and 0.83 amount to about 1.5 and 0.3 log-units at 950 and 1400 K, respectively. Comparisons of the viscosities of the residual liquid matrix and of the initially crystal-free basalt show that physical effects caused by the presence of microcrystals begin to be observed at a low crystal fraction of 5 vol%. Finally, a model of viscosity calculation is developed for the melts which reproduces all data obtained in this work to better than 10%. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Earth & Planetary Science Letters is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/S0012-821X(03)00641-1
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 14
        StartPage: 31
    Subjects:
      – SubjectFull: Microstructure
        Type: general
      – SubjectFull: Viscosity
        Type: general
      – SubjectFull: Basalt
        Type: general
      – SubjectFull: Glass transition temperature
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      – TitleFull: Redox state, microstructure and viscosity of a partially crystallized basalt melt
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            NameFull: Richet, Pascal
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            NameFull: Roskosz, Mathieu
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            NameFull: Ingrin, Jannick
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            – D: 30
              M: 01
              Text: Jan2004
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              Y: 2004
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              Value: 218
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