Neomorphosed Carbonate (N/1/Pm/NMx)
 2.5x
|
 5x
|
 2.5 cross nicols
|
 5x cross nicol
|
 2.5 wave plate
|
 5x wave plate
|
| Outstanding feature |
Fine grained equant calcite crystals replace micrite matrix |
| Folk Classification |
Sparsely fosilliferous porous pelmicrite |
| Dunham Classification |
Sparsely fosilliferous porous pelpackstone |
| Common Grains |
Pelloids or calcite lathes from broken bioclasts |
| Sorting |
Poorly sorted |
| Rounding |
Rounded |
| Micritization & envelopes |
Grains are peloids or ooids and micrite envelopes |
| Cement & diagenetic fabric |
Complete replacement of pelloids and calcite by equant calcite |
| Porosity |
5% Leached Intrapartical |
| Depositional Setting |
Low energy shoal |
| Diagenetic history |
Recrystallized micrite & leached fossil bioclasts |
Striking recrystallization of micrite with grain growth mozaic and seperate clear equant authogenic calcite. This is the grain growth or neomorphism of Folk. Note inverted photograph (5x images) of cavity whose upper portion is filled by calcite spar and whose floor is covered by silt sized carbonate crystals. The roof of the cavity (now the lower part of cavity)appears to be been eroded and collapsed producing the intergitate irregular margin, while the floor (the upper part of the cavity) is smoother, a product of sediment fill.
Thursday, November 11, 2021