Activity-composition relation of jadeite in omphacite pyroxene: Theoretical deductions

Jibamitra Ganguly

doi:10.1016/0012-821X(73)90109-X

Activity-composition relation of jadeite in omphacite pyroxene: Theoretical deductions

Jibamitra Ganguly

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

31 Scopus citations

Abstract

Theoretical considerations suggest that the activity coefficient of jadeite in natural multicomponent omphacite pyroxene can be approximated by an expression of the form RT ln γ_jd {reversed tilde equals} W₁₂ (X_Di + X_Hed) (I - X_Jd), where W₁₂ is an adjustable interchange parameter in the jadeite-diopside join, and X stands for the mole fraction of the specified component in the pyroxene solid solution. Synthesis of the available experimental and observational data yields W₁₂ {reversed tilde equals} - 1400 (± 1400) + 1.16 (± 1.16) cal/mole, suggesting a nearly ideal solution around 1100°C, and negative departure from ideality at low temperature of the jadeite-diopside solid solution.

Original language	English (US)
Pages (from-to)	145-153
Number of pages	9
Journal	Earth and Planetary Science Letters
Volume	19
Issue number	2
DOIs	https://doi.org/10.1016/0012-821X(73)90109-X
State	Published - Jun 1973
Externally published	Yes

ASJC Scopus subject areas

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

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10.1016/0012-821X(73)90109-X

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title = "Activity-composition relation of jadeite in omphacite pyroxene: Theoretical deductions",

abstract = "Theoretical considerations suggest that the activity coefficient of jadeite in natural multicomponent omphacite pyroxene can be approximated by an expression of the form RT ln γjd {reversed tilde equals} W12 (XDi + XHed) (I - XJd), where W12 is an adjustable interchange parameter in the jadeite-diopside join, and X stands for the mole fraction of the specified component in the pyroxene solid solution. Synthesis of the available experimental and observational data yields W12 {reversed tilde equals} - 1400 (± 1400) + 1.16 (± 1.16) cal/mole, suggesting a nearly ideal solution around 1100°C, and negative departure from ideality at low temperature of the jadeite-diopside solid solution.",

author = "Jibamitra Ganguly",

year = "1973",

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doi = "10.1016/0012-821X(73)90109-X",

language = "English (US)",

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pages = "145--153",

journal = "Earth and Planetary Science Letters",

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T1 - Activity-composition relation of jadeite in omphacite pyroxene

T2 - Theoretical deductions

AU - Ganguly, Jibamitra

PY - 1973/6

Y1 - 1973/6

N2 - Theoretical considerations suggest that the activity coefficient of jadeite in natural multicomponent omphacite pyroxene can be approximated by an expression of the form RT ln γjd {reversed tilde equals} W12 (XDi + XHed) (I - XJd), where W12 is an adjustable interchange parameter in the jadeite-diopside join, and X stands for the mole fraction of the specified component in the pyroxene solid solution. Synthesis of the available experimental and observational data yields W12 {reversed tilde equals} - 1400 (± 1400) + 1.16 (± 1.16) cal/mole, suggesting a nearly ideal solution around 1100°C, and negative departure from ideality at low temperature of the jadeite-diopside solid solution.

AB - Theoretical considerations suggest that the activity coefficient of jadeite in natural multicomponent omphacite pyroxene can be approximated by an expression of the form RT ln γjd {reversed tilde equals} W12 (XDi + XHed) (I - XJd), where W12 is an adjustable interchange parameter in the jadeite-diopside join, and X stands for the mole fraction of the specified component in the pyroxene solid solution. Synthesis of the available experimental and observational data yields W12 {reversed tilde equals} - 1400 (± 1400) + 1.16 (± 1.16) cal/mole, suggesting a nearly ideal solution around 1100°C, and negative departure from ideality at low temperature of the jadeite-diopside solid solution.

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JO - Earth and Planetary Science Letters

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Activity-composition relation of jadeite in omphacite pyroxene: Theoretical deductions

Abstract

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