Abstract
Carbonatites are rare igneous carbonate-rich rocks. Most carbonatites contain a large number of accessory oxide, sulfide, and silicate minerals. Baddeleyite (ZrO2) and zircon (ZrSiO4) are common accessory minerals in carbonatites and because these minerals host high concentrations of U and Th, they are often used to determine the ages of formation of the carbonatite. In an experimental study, we constrain the stability fields of baddeleyite and zircon in Ca-rich carbonate melts with different silica concentrations. Our results show that SiO2-free and low silica carbonate melts crystallize baddeleyite, whereas zircon only crystallizes in melts with higher concentration of SiO2. We also find that the zirconsilicate baghdadite (Ca3ZrSi2O9) crystallizes in intermediate compositions. Our experiments indicate that zircon may not be a primary mineral in a low-silica carbonatite melt and care must be taken when interpreting zircon ages from low-silica carbonatite rocks.
Acknowledgments
We thank Maik Trogisch for his help with sample preparation and Beate Schmitte for her help with the electron microprobe analyses. Further thanks go to C. Sanchez-Valle for her help with the Raman spectroscopy. Thanks also go to A.R. Chakhmouradian, an anonymous reviewer, and the editor for their helpful and constructive comments and suggestions. F. Gervasoni thanks the Brazilian CAPES foundation for a Ph.D. scholarship (BEX 12363/12-0) in Germany.
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Articles in the same Issue
- Review: Minerals in the Human Body
- Mineral precipitation and dissolution in the kidney
- Special Collection: Nanominerals and Mineral Nanoparticles
- Luogufengite: A new nano-mineral of Fe2O3 polymorph with giant coercive field
- Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
- Column anion arrangements in chemically zoned ternary chlorapatite and fluorapatite from Kurokura, Japan
- Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
- Magmatic graphite inclusions in Mn-Fe-rich fluorapatite of perphosphorus granites (the Belvís pluton, Variscan Iberian Belt)
- Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
- Barometric constraints based on apatite inclusions in garnet
- Special collection: Olivine
- A comparison of olivine-melt thermometers based on DMg and DNi: The effects of melt composition, temperature, and pressure with applications to MORBs and hydrous arc basalts
- Special collection: Dynamics of magmatic processes
- Water transfer during magma mixing events: Insights into crystal mush rejuvenation and melt extraction processes
- Special collection: Rates and depths of magma ascent on earth
- A new clinopyroxene-liquid barometer, and implications for magma storage pressures under Icelandic rift zones
- The S content of silicate melts at sulfide saturation: New experiments and a model incorporating the effects of sulfide composition
- Bond valence and bond energy
- Fluvial transport of impact evidence from cratonic interior to passive margin: Vredefort-derived shocked zircon on the Atlantic coast of South Africa
- Iron partitioning in natural lower-mantle minerals: Toward a chemically heterogeneous lower mantle
- Identifying biogenic silica: Mudrock micro-fabric explored through charge contrast imaging
- Compressibility and high-pressure structural behavior of Mg2Fe2O5
- Thermo-elastic behavior of grossular garnet at high pressures and temperatures
- Experimental constraints on the stability of baddeleyite and zircon in carbonate- and silicate-carbonate melts
- Polarized FTIR spectroscopic examination on hydroxylation in the minerals of the wolframite group, (Fe,Mn,Mg)[W,(Nb,Ta)][O,(OH)]4
- Tourmaline-rich features in the Heemskirk and Pieman Heads granites from western Tasmania, Australia: Characteristics, origins, and implications for tin mineralization
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- Fluorwavellite, Al3(PO4)2(OH)2F·5H2O, the fluorine analog of wavellite
- New Mineral Names
- Book Review
- Book Review: Geochemical Rate Models: An Introduction to Geochemical Kinetics
- Book Review
- Book Review: Oxygen: A Four Billion Year History
- Erratum
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Articles in the same Issue
- Review: Minerals in the Human Body
- Mineral precipitation and dissolution in the kidney
- Special Collection: Nanominerals and Mineral Nanoparticles
- Luogufengite: A new nano-mineral of Fe2O3 polymorph with giant coercive field
- Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
- Column anion arrangements in chemically zoned ternary chlorapatite and fluorapatite from Kurokura, Japan
- Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
- Magmatic graphite inclusions in Mn-Fe-rich fluorapatite of perphosphorus granites (the Belvís pluton, Variscan Iberian Belt)
- Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
- Barometric constraints based on apatite inclusions in garnet
- Special collection: Olivine
- A comparison of olivine-melt thermometers based on DMg and DNi: The effects of melt composition, temperature, and pressure with applications to MORBs and hydrous arc basalts
- Special collection: Dynamics of magmatic processes
- Water transfer during magma mixing events: Insights into crystal mush rejuvenation and melt extraction processes
- Special collection: Rates and depths of magma ascent on earth
- A new clinopyroxene-liquid barometer, and implications for magma storage pressures under Icelandic rift zones
- The S content of silicate melts at sulfide saturation: New experiments and a model incorporating the effects of sulfide composition
- Bond valence and bond energy
- Fluvial transport of impact evidence from cratonic interior to passive margin: Vredefort-derived shocked zircon on the Atlantic coast of South Africa
- Iron partitioning in natural lower-mantle minerals: Toward a chemically heterogeneous lower mantle
- Identifying biogenic silica: Mudrock micro-fabric explored through charge contrast imaging
- Compressibility and high-pressure structural behavior of Mg2Fe2O5
- Thermo-elastic behavior of grossular garnet at high pressures and temperatures
- Experimental constraints on the stability of baddeleyite and zircon in carbonate- and silicate-carbonate melts
- Polarized FTIR spectroscopic examination on hydroxylation in the minerals of the wolframite group, (Fe,Mn,Mg)[W,(Nb,Ta)][O,(OH)]4
- Tourmaline-rich features in the Heemskirk and Pieman Heads granites from western Tasmania, Australia: Characteristics, origins, and implications for tin mineralization
- Ca L2,3-edge near edge X-ray absorption fine structure of tricalcium aluminate, gypsum, and calcium (sulfo)aluminate hydrates
- Fluorwavellite, Al3(PO4)2(OH)2F·5H2O, the fluorine analog of wavellite
- New Mineral Names
- Book Review
- Book Review: Geochemical Rate Models: An Introduction to Geochemical Kinetics
- Book Review
- Book Review: Oxygen: A Four Billion Year History
- Erratum
- Calibration of Fe XANES for high-precision determination of Fe oxidation state in glasses: Comparison of new and existing results obtained at different synchrotron radiation sources