Dolomite ( Dol-/2/? )

5x cross nicol
5x wave plate
10x wave plate
Outstanding feature Crystalline dolomite mozaic replaces pelloids and calcite
Folk Classification Dolomitized Pelsparite or Oosparite
Dunham Classification Dolomitized Pelgrainstone or Oograinstone
Common Grains Pelloids or Ooids with sparse anhydite lathes
Sorting well sorted
Rounding well rounded
Micritization & envelopes Grains are peloids or ooids and micrite envelopes
Cement & diagenetic fabric Complete replacement of pelloids and calcite by dolomite
Porosity 1-35% Intercrystalline
Depositional Setting High energy shoal
Diagenetic history Complete dolomitization of pelloids &/or ooids & cement
Striking replacement of either pelloids or ooids and micrite envelopes by mozaic of clear equant authogenic dolomite. Note sparse anhydrite lathes.

Monday, August 27, 2018
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