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Genesis of carbonate aggregates in lamprophyres from the northeastern Transdanubian Central Range, Hungary: Magmatic or hydrothermal origin?

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Summary

Carbonate aggregates in Late Cretaceous lamprophyre dikes of the northeastern Transdanubian Central Range (TCR) in Northwest Hungary have been classified into three genetic groups. Type-I dolomite + calcite ± magnesite aggregates have petrographic and geochemical features similar to ocelli described by other workers. Fluid inclusions in Type-I aggregates homogenize between 77 and 204 °C and are of hydrothermal origin. Type-II aggregates are characterized by a polygonal shape and are mostly dolomite. Based on their shape and primary fluid inclusions which homogenize between 95 and 172 °C, these carbonate aggregates are interpreted to fill vugs produced by the dissolution of olivine phenocrysts. Type-III carbonate aggregates show an irregular to polygonal shape and distinct compositional zonation and contain secondary aqueous fluid inclusions. Homogenization temperatures of fluid inclusions are below 104 °C, and zonation patterns suggest partial recrystallization. These carbonate aggregates are most likely xenoliths and xenocrysts from the wall rocks of the lamprophyre melt conduits.

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Authors and Affiliations

  1. Lithosphere Fluid Research Laboratory, Department of Petrology and Geochemistry, Eötvös University, Budapest, Hungary

    T. Azbej & C. Szabó

  2. Fluids Research Laboratory, Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, USA

    T. Azbej & R. J. Bodnar

  3. Institute for Geochemical Research, Hungarian Academy of Sciences, Budapest, Hungary

    G. Dobosi

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  1. T. Azbej
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  2. C. Szabó
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  3. R. J. Bodnar
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  4. G. Dobosi
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Azbej, T., Szabó, C., Bodnar, R. et al. Genesis of carbonate aggregates in lamprophyres from the northeastern Transdanubian Central Range, Hungary: Magmatic or hydrothermal origin?. Mineralogy and Petrology 88, 479–497 (2006). https://doi.org/10.1007/s00710-006-0123-y

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