S12. Limestone - Peloidal-rich biomicrite / wakestone
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Fact sheet
Description: 

This sample can be classified using the Dunham/Folk Classification. Dark grey fine grained limestone with ostracod fragments. Dark muddy lst with >10 % grains mud supported.  % content: grains 20% (mostly ostracod / brachs <0.5 mm), sparite cement 10% (mainly within bivalved shells), micrite 70 % (entire micrite matrix incl peloids), no non-carbonate components. Non-skeletal grains: 95% peloids, 5% ooids, 5% grapestones, also calcispheres. Skeletal grains: 100% ostracod (most likely as small thin shells) vs. brach shells. Classification: Peloidal-rich biomicrite / wackestone. Diagenesis: Some evidence of compaction and sutured contacts. Flattened peloids. Cement crystals are non-syntaxial calcite crystals that fill previous pore space. Perhaps larger spar crystals formed after micrite mud - calcitisation. 

In Place
In Time
Accuracy:
Timescale:
Not known
Ma = Millions of years ago
In Focus
Type:
Type: 
sedimentary
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Rock-forming minerals:

Rock forming mineral:

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