Stable isotope and chemical compositions of carbonate ocelli and veins in Mesozoic lamprophyres of Hungary

A. Demeny, I. Forizs, F. Molnar

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Abstract

Lamprophyres and carbonatites of late Cretaceous age occurring in Palaeozoic to Mesozoic granites and sedimentary rocks contain carbonate ocelli and veins which show alteration resulting in the formation of disseminated carbonate and clay minerals. Those bodies intruding granites contain calcite and dolomite whose carbon isotopic compositions (δ13C ≃ -4.5‰) are within the primary mantle ranges, whereas the oxygen isotopic compositions (δ18O ≃ 14‰) are well outside the ranges of primary carbonatites. Carbonate ocelli of the lamprophyres were formed by interactions of igneous fluids with xenoliths of sedimentary origin. Interactions with the magma have also changed the chemical composition of limestone xenoliths enclosed in the lamprophyres. -from Authors

Original languageEnglish
Pages (from-to)679-690
Number of pages12
JournalEuropean Journal of Mineralogy
Volume6
Issue number5
DOIs
Publication statusPublished - Jan 1 1994

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ASJC Scopus subject areas

  • Geochemistry and Petrology

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