Petrology, chemistry and diagenesis of calcite concretions in Silurian shales from central Sweden

Sadoon Morad, Melesse Eshete

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39 Scopus citations

Abstract

Calcite concretions in the lower Silurian Rastrites Shale from central Sweden were formed within 1 m depth of the seafloor. Micrite (1-4 μm) was formed initially but recrystallized into microspar (> 4-50 μm) and subsequently transformed into pseudospar (> 50-150 μm). Skeletal calcite in the concretions and in the host shale has been replaced by microspar which is chemically similar to that occurring in the concretion body. The δ13CPDB values (mostly between -2‰ and 2‰) suggest that carbonates were mainly derived from seawater. Some of the carbon within calcite was derived from the oxidation of organic matter. Recrystallization has resulted in increasingly negative δ18 OPDB values (-7‰ to -4.3‰) whereas the δ13C was not changed significantly.

Original languageBritish English
Pages (from-to)113-134
Number of pages22
JournalSedimentary Geology
Volume66
Issue number1-2
DOIs
StatePublished - Feb 1990

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