Ooids Form Voids in Aeolian Dunes - Aragonite Dissolved - Pleistocene (O/18/Ple/Bah)
| Outstanding feature |
Dissolution of aragonite ooids |
| Folk Classification |
Well sorted porous oosparite |
| Dunham Classification |
Well sorted porous oograinstone |
| Common Grains |
Dissolved ooids and bioclasts |
| Sorting |
Well sorted |
| Rounding |
Well rounded |
| Micritization & envelopes |
Some micritized ooids |
| Cement & diagenetic fabric |
Well cemented by low mag-calcite spar |
| Porosity |
20% leached intrapartical porosity |
| Depositional Setting |
Aeolian dune |
| Diagenetic history |
Precipitation of aragonite as ooid cortex on pellets, grapestones and quartz. |
Striking high energy concentric aragonite ooid grains that accumulated on the NW corner of New Providence Island in the Bahama as aeolian dunes formed during Pleistocene sea level lows. These dunes have undergone freshwater leaching and cementation by low magnesian calcite spar derived from previous aragonite material.
Thursday, November 11, 2021