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- W110151722 abstract "The septarian carbonate concretions from the Boom Clay (Belgium) consist mainly of authigenic minerals such as micrite (≤ 70% bulk volume) and pyrite framboids (∼ 3%). These mineral phases occur between detrital grains and fossils. The septarian cracks are lined with calcite, which is sometimes covered with pyrite. The preservation of delicate sedimentological features in the concretion matrix (hardly compacted faecal pellets, burrows and uncrushed shells) points to an early origin of the concretions. Systematic geochemical variations from concretion centre to edge suggest that growth continued during shallow burial. Theδ13C values (−17.5 to −20.5‰) of the concretionary carbonate show that bacterial sulphate-reduction processes were dominant. Sulphate-reduction-derived HCO3- was diluted by marine-related HCO3-, derived from dissolved bioclasts. A slight enrichment in δ13C during growth is caused by the decreasing influence of sulphate reduction because of the progressive closure of the diagenetic system due to shallow-burial compaction. The δ18O values (−0.5 to +1.0‰) of the concretionary carbonate point to a marine origin. The slightly 18O-depleted signature with respect to time-equivalent marine-derived carbonate relates to the incorporation of an 18O-depleted component, originating from sulphate and organic matter. The slight decrease in δ18O during growth relates to an increasing influence of this component and to a decreasing influence of seawater-derived oxygen during early diagenesis." @default.
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- W110151722 date "1998-01-01" @default.
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- W110151722 doi "https://doi.org/10.1023/a:1003468328212" @default.
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