Dolomite ( Dol-/12/Pm/Tx )
2.5x
|
5x
|
5x wave plate
|
10x
|
5x
|
Outstanding feature | Dolomitized micritic fabric replaces pelloids and intraclasts. Some circular dasyclad algal plates. |
Folk Classification | Dolomitized Pelsparite or Intrasparite |
Dunham Classification | Dolomitized Pelgrainstone or Intraclastic Grainstone |
Common Grains | Pelloids and/or intraclastst cemented by dolomite spar |
Sorting | Biomodal but well sorted |
Rounding | Rounded |
Micritization & envelopes | Grains are peloids or intraclasts with micrite envelopes |
Cement & diagenetic fabric | Complete replacement of pelloids and intraclasts by dolomite |
Porosity | 5-10% Interparticle |
Depositional Setting | Moderate energy shoal |
Diagenetic history | Complete dolomitization of pelloids &/or intraclasts & cement |
Striking replacement of either pelloids or intraclasts and micrite envelopes by micrite sized authogenic dolomite.There are the remains of what appears to be Dasyclad algal plates. Note sparse interparticle porosity.
Thursday, November 11, 2021