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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Aspects of Diagenesis in Some Irish Carboniferous Limestones
Norman C. Wardlaw
ABSTRACT
The study of thin sections provides evidence that in certain Carboniferous limestones from County Tipperary, Ireland, recrystallization of calcite has transformed calcarenites into calcilutites, in which the crystals are less than 64µ and generally are from 5 to 15µ in diameter. This recrystallization occurred in both weakly deformed (commonly taken as undeformed) and strongly deformed limestones. If only hand specimens were studied, the fine-grained calcite, misinterpreted as primary, might well lead to erroneous conclusions about the environment of deposition.
Associated with the limestones are thin layers of chert which replace calcite. Within these cherts there was a subsequent partial replacement of microcrystalline quartz by calcite.
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