Injective carbonate xenobreccias and anhydritites in carbonatites of the Pavlovsky massif, East Taimyr
Proskurnin V. F., Saltanov V. A., Petrov O. V., Silaev V. I., Remizov D. N., Gavrish A. V.
Zapiski RMO (Proceedings of the Russian Mineralogical Society). 2016. V. 145. N 6. P. 1-19
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Language: Russian
Abstract
Peculiar injective carbonate breccias and anhydrite rocks with xenogenic clasts of various compositions have been for the first time detected inside the Pavlovsky carbonatite-culdimite massif. On the base of obtained petrographic, mineralogical and geochemical data these carbonate breccias were attributed to fluid-explosive lithocrystalloclastic authigenic-allogenic carbonatite; sulfate rocks — to fluidogenic anhydritic rocks subjected to epigenetic replacement by gypsum. Formation of these bodies is discussed in connection with the magmatogene-fluidogenic differentiation of a crustal source under cover of the Late Palaeozoic mudstone-clastic rocks in haloid-sulfate-carbonate environment. Injections had the character of periodical discharge from the source due to decompression while the Early Cimmerian orogeny (margin between Middle and Late Triassique). Mineralogical-geochemical features of these injective breccias and anhydrite rocks testify to magmatogenic (mantle) and hydrogenic (crustal) fluids mixing at an intermediate crustal level.
Key words: carbonatites, culdimites, fluid-explosive breccias, anhydritic rocks, injective bodies, mineralogy and geochemistry of breccias and sulfate rocks.
