Microscopic

Dolomite - Calcite Peloids & Intraclasts - Porosity ( Dol-/10/Jur/Saudi )

2.5x
5x
2.5x
2.5x wave plate
5x
5x wave plate
10x
10x wave plate
2.5x
5x
5x cross nicol
10x
10x cross nicols
Outstanding feature Crystalline & interparicle porosity with calcitic peloids and interclasts
Folk Classification Dolomite rhomb & micritic mozaic
Dunham Classification Dolomite rhomb & mud sized mozaic
Common Grains Dolomite rhombs and mcrite sized xstals
Sorting Bimodal crystal size
Rounding Angular rhombs & micritic dolomite
Micritization & envelopes None
Cement & diagenetic fabric Complete replacement of original fabric by dolomite
Porosity 7% Intercrystalline
Depositional Setting Unknown
Diagenetic history Complete dolomitization of original fabric
Striking equant rhombic and micrite sized crystals of authogenic dolomite. Note blue expoxy fill of porosity between the dolomite rhombs.

Friday, March 27, 2020
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