Interpenetrating Radial Calcitic Ooids (O/28/)

10x wave plate
Outstanding feature Radial calcitic ooids interpenetrating
Folk Classification Well sorted oosparite, skeletal nucleae
Dunham Classification Well sorted oograinstone
Common Grains Radial calcitic ooids, some skeletal nucleae
Sorting Well sorted
Rounding Well rounded
Micritization & envelopes Fine micritized borings into radial fabric
Cement & diagenetic fabric Some thin equant rims and final spar fill
Porosity Dense, none
Depositional Setting High energy shoal
Diagenetic history Potentially a marine rim replaced by equant calcite with a final equant spar fill. Pressure solution at grain contacts.

Well preserved radial calcitic ooid grains that accumulated on higher energy shoals. Initial rim cements may be after marine rims. Later these rimmed cements have undergone alteration to calcite with freshwater driven diagenesis. The final void fill cementation was by low magnesian calcite spar. The carbonate of the cement was probably derived from earlier aragonitic material. Pressure solution at grain contacts; note how sometimes the radial fabric penetrates grain boundaries at these contacts.

Thursday, November 11, 2021
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