Experimental investigation of andradite and hedenbergite equilibria employing the hydrogen sensor technique, with revised estimates of ΔfG0                         m,298 for andradite and hedenbergite

D. P. Moecher; I. M. Chou

Experimental investigation of andradite and hedenbergite equilibria employing the hydrogen sensor technique, with revised estimates of Δ_fG⁰ _m,298 for andradite and hedenbergite

D. P. Moecher, I. M. Chou

Earth and Environmental Sciences

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21 Scopus citations

Abstract

Hydrothermal experiments were carried out at 2 kbar, 600-860°C to resolve discrepancies among previous studies on f_O2-T stability relations for the following equilibria: 1) andradite (And) = hematite (Hm) + wollastonite (Wo), 2) And = magnetite (Mt) + Wo + O₂, 3) And + quartz (Qz) = hedenbergite (Hd) + Wo + O₂, and 4) And + Mt + Qz = Hd + O₂. A variety of O buffer and H₂ generation techniques were used to access a wide range of f_O2-T conditions. The results yielded an internally consistent set of experiments on andradite and hedenbergite stability. The Δ_fG⁰ _m,298 for andradite and hedenbergite calculated from the data are -5428.0 ± 5.9 and =2676.6 ± 5.3 kJ/mol, respectively. -from Authors

Original language	English
Pages (from-to)	1327-1341
Number of pages	15
Journal	American Mineralogist
Volume	75
Issue number	11-12
State	Published - 1990

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology

Cite this

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title = "Experimental investigation of andradite and hedenbergite equilibria employing the hydrogen sensor technique, with revised estimates of ΔfG0 m,298 for andradite and hedenbergite",

abstract = "Hydrothermal experiments were carried out at 2 kbar, 600-860°C to resolve discrepancies among previous studies on fO2-T stability relations for the following equilibria: 1) andradite (And) = hematite (Hm) + wollastonite (Wo), 2) And = magnetite (Mt) + Wo + O2, 3) And + quartz (Qz) = hedenbergite (Hd) + Wo + O2, and 4) And + Mt + Qz = Hd + O2. A variety of O buffer and H2 generation techniques were used to access a wide range of fO2-T conditions. The results yielded an internally consistent set of experiments on andradite and hedenbergite stability. The ΔfG0 m,298 for andradite and hedenbergite calculated from the data are -5428.0 ± 5.9 and =2676.6 ± 5.3 kJ/mol, respectively. -from Authors",

author = "Moecher, {D. P.} and Chou, {I. M.}",

year = "1990",

language = "English",

volume = "75",

pages = "1327--1341",

number = "11-12",

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TY - JOUR

T1 - Experimental investigation of andradite and hedenbergite equilibria employing the hydrogen sensor technique, with revised estimates of ΔfG0 m,298 for andradite and hedenbergite

AU - Moecher, D. P.

AU - Chou, I. M.

PY - 1990

Y1 - 1990

N2 - Hydrothermal experiments were carried out at 2 kbar, 600-860°C to resolve discrepancies among previous studies on fO2-T stability relations for the following equilibria: 1) andradite (And) = hematite (Hm) + wollastonite (Wo), 2) And = magnetite (Mt) + Wo + O2, 3) And + quartz (Qz) = hedenbergite (Hd) + Wo + O2, and 4) And + Mt + Qz = Hd + O2. A variety of O buffer and H2 generation techniques were used to access a wide range of fO2-T conditions. The results yielded an internally consistent set of experiments on andradite and hedenbergite stability. The ΔfG0 m,298 for andradite and hedenbergite calculated from the data are -5428.0 ± 5.9 and =2676.6 ± 5.3 kJ/mol, respectively. -from Authors

AB - Hydrothermal experiments were carried out at 2 kbar, 600-860°C to resolve discrepancies among previous studies on fO2-T stability relations for the following equilibria: 1) andradite (And) = hematite (Hm) + wollastonite (Wo), 2) And = magnetite (Mt) + Wo + O2, 3) And + quartz (Qz) = hedenbergite (Hd) + Wo + O2, and 4) And + Mt + Qz = Hd + O2. A variety of O buffer and H2 generation techniques were used to access a wide range of fO2-T conditions. The results yielded an internally consistent set of experiments on andradite and hedenbergite stability. The ΔfG0 m,298 for andradite and hedenbergite calculated from the data are -5428.0 ± 5.9 and =2676.6 ± 5.3 kJ/mol, respectively. -from Authors

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Experimental investigation of andradite and hedenbergite equilibria employing the hydrogen sensor technique, with revised estimates of Δ_fG⁰ _m,298 for andradite and hedenbergite

Abstract

ASJC Scopus subject areas

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