Skeletal - Coral (B/8/Ple/Eni)
 2.5x
|
 5x
|
 5x cross nichols
|
 2.5x
|
 5x
|
 10x
|
| Outstanding feature |
Aragonite and micrite fill of cavities |
| Folk Classification |
Coral biolithite with some argonite fibers & micrite cavity fill |
| Dunham Classification |
Coral framestone with some argonite fibers & micrite cavity fill |
| Common Grains |
Coral with aragonite fibers & micrite |
| Sorting |
None |
| Rounding |
None |
| Micritization & envelopes |
Cavitiy margins show micrite rim |
| Cement & diagenetic fabric |
Sparse fibrous aragonite & micrite fill |
| Porosity |
30% interpartical |
| Depositional Setting |
Coral reef atoll |
| Diagenetic history |
Marine cementation & freshwater etching |
This sample shows the initial fill by marine aragonite cements in the original coral living chambers. In addition their appears to be the start of freshwater diagenesis etching of coral chamber walls and the influx of micrite.
Thursday, November 11, 2021