Skeletal - Corals, Molluscs & Echinoids (B/20/Ple/Eni)
 2.5x
|
 5x
|
 10x
|
 2.5x
|
 5x
|
 10x
|
 5x
|
 5x wave plate
|
 10x
|
 10x wave plate
|
| Outstanding feature |
Halimeda disolution & echinoid spines |
| Folk Classification |
Leached poorly washed biosparite |
| Dunham Classification |
Leached packstone to grainstone |
| Common Grains |
Halimeda flakes, echinoid spines, corals |
| Sorting |
Good to poor |
| Rounding |
Good to poor |
| Micritization & envelopes |
Some thin micrite envelopes |
| Cement & diagenetic fabric |
Disolution of aragonite and cementation by low magnesian calcite |
| Porosity |
Interparticle, & leached intraparticle 30% |
| Depositional Setting |
Mixed low & high energy atoll margin |
| Diagenetic history |
Marine cementation followed by freshwater diagenesis including disolution and cementation. |
Well in the margin of the Eniwetok atoll in the Marshall Islands. Halimeda flakes, echinoid spines, corals, and bryozoan fragments. Mixed high and low energy setting exposed to marine and freshwater diagenesis.
Thursday, November 11, 2021