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Differential Scanning Calorimetry of Minerals of the Dolomite-Ferroan-Dolomite-Ankerite Series in Flowing Carbon Dioxide

Published online by Cambridge University Press:  05 July 2018

J. V. Dubrawski  and
S. St. J. Warne
J. V. Dubrawski
Affiliation:
BHP Central Research Laboratories, PO Box 188, Wallsend, NSW 2287, Australia
S. St. J. Warne
Affiliation:
Department of Geology, University of Newcastle, Shortland, NSW 2308, Australia
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Abstract

The dolomite-ferroan-dolomite-ankerite series of carbonate minerals has been investigated in flowing carbon dioxide using high-temperature DSC. Decomposition products were analysed by X-ray diffraction. The minerals studied included dolomite containing no iron, and members substituted by iron in the molar ratio range of 0.082 to 0.49. Complete resolution of the three main endothermic features was observed and enthalpy values ΔH, determined from each. The individual and total enthalpy values showed a linear dependence upon the Fe and Mg content of the members across the series. A decrease in the enthalpy of decomposition occurs with increasing Fe content. The effect of Fe substitution was readily observed and the estimated limit of detection is less than 1% FeO. Accuracy of the measurements was limited by the purity of the minerals themselves.

Keywords

dolomiteferroan dolomiteankeritedifferential scanning calorimetryX-ray diffractioncarbon dioxide
Type
Mineralogy
Information
Mineralogical Magazine , Volume 52 , Issue 368 , December 1988 , pp. 627 - 635
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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