Hydrous calcium magnesium carbonate, A possible precursor to the formation of sedimentary dolomite

Ian J. Kelleher; Simon A.T. Redfern

doi:10.1080/08927020290030134

Hydrous calcium magnesium carbonate, A possible precursor to the formation of sedimentary dolomite

Ian J. Kelleher, Simon A.T. Redfern^*

^*Corresponding author for this work

University of Cambridge

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

51 Citations (Scopus)

Abstract

Material of composition Ca_1.056Mg_0.944(SO ₄)_0.035(CO₃)_1.965·0.26H ₂ has been synthesised from solutions of Ca(NO₃) ₂, MgSO₄ and Na₂CO₃. X-ray diffraction and infrared spectroscopy show this to be identical to " protodolomite" found in nature, and that the structure is related to dolomite but is hydrous, retaining water to beyond 200°C on heating. This hydrous magnesium calcium carbonate grows as spherules, with a distinct core-rim structure apparent in optical microscopy. It seems likely that in low-temperature environments (around 80°C) a dolomite crystal grows in nature via this or a similar hydrous intermediate phase, which may hold the solution to the "dolomite problem".

Original language	English
Pages (from-to)	557-572
Number of pages	16
Journal	Molecular Simulation
Volume	28
Issue number	6-7
DOIs	https://doi.org/10.1080/08927020290030134
Publication status	Published - Jan 1 2002
Externally published	Yes

ASJC Scopus Subject Areas

General Chemistry
Information Systems
Modelling and Simulation
General Chemical Engineering
General Materials Science
Condensed Matter Physics

Keywords

Hydrous calcium magnesium carbonate
Protodolomite
Sedimentary dolomite

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10.1080/08927020290030134

Cite this

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title = "Hydrous calcium magnesium carbonate, A possible precursor to the formation of sedimentary dolomite",

abstract = "Material of composition Ca1.056Mg0.944(SO 4)0.035(CO3)1.965·0.26H 2 has been synthesised from solutions of Ca(NO3) 2, MgSO4 and Na2CO3. X-ray diffraction and infrared spectroscopy show this to be identical to {"} protodolomite{"} found in nature, and that the structure is related to dolomite but is hydrous, retaining water to beyond 200°C on heating. This hydrous magnesium calcium carbonate grows as spherules, with a distinct core-rim structure apparent in optical microscopy. It seems likely that in low-temperature environments (around 80°C) a dolomite crystal grows in nature via this or a similar hydrous intermediate phase, which may hold the solution to the {"}dolomite problem{"}.",

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AU - Kelleher, Ian J.

AU - Redfern, Simon A.T.

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N2 - Material of composition Ca1.056Mg0.944(SO 4)0.035(CO3)1.965·0.26H 2 has been synthesised from solutions of Ca(NO3) 2, MgSO4 and Na2CO3. X-ray diffraction and infrared spectroscopy show this to be identical to " protodolomite" found in nature, and that the structure is related to dolomite but is hydrous, retaining water to beyond 200°C on heating. This hydrous magnesium calcium carbonate grows as spherules, with a distinct core-rim structure apparent in optical microscopy. It seems likely that in low-temperature environments (around 80°C) a dolomite crystal grows in nature via this or a similar hydrous intermediate phase, which may hold the solution to the "dolomite problem".

AB - Material of composition Ca1.056Mg0.944(SO 4)0.035(CO3)1.965·0.26H 2 has been synthesised from solutions of Ca(NO3) 2, MgSO4 and Na2CO3. X-ray diffraction and infrared spectroscopy show this to be identical to " protodolomite" found in nature, and that the structure is related to dolomite but is hydrous, retaining water to beyond 200°C on heating. This hydrous magnesium calcium carbonate grows as spherules, with a distinct core-rim structure apparent in optical microscopy. It seems likely that in low-temperature environments (around 80°C) a dolomite crystal grows in nature via this or a similar hydrous intermediate phase, which may hold the solution to the "dolomite problem".

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Hydrous calcium magnesium carbonate, A possible precursor to the formation of sedimentary dolomite

Abstract

ASJC Scopus Subject Areas

Keywords

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