Ooid - Cortex Layers Brittle, Compact & Break - Cretaceous (O/38/K/Tx)

Outstanding feature Radial ooids
Folk Classification Well sorted oosparite
Dunham Classification Well sorted oograinstone
Common Grains Ooids
Sorting Well sorted
Rounding Well rounded
Micritization & envelopes Some micritized borings into radial fabric
Cement & diagenetic fabric Thin equant rims and final spar fill
Porosity Intercrystalline
Depositional Setting High energy but restricted shoal
Diagenetic history Equant calcite is a final spar fill

Calcitic ooid grains that accumulated on high energy shoals. Sparse isopachus rim cements are calcite. Ths final void fill cementation is low magnesian calcite equant spar. Some of the spar is penetrating and replacing the ooids. The calcite cement was probably derived from earlier aragonitic material. The ooids are interpenetrating and have peloids nucleae. Ooid layers or cortex become brittle and locally break off the surfaces of the ooids under compaction.

Thursday, November 11, 2021
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