Ooids ( O/4/Hol/AbuD )

10x cross nicols
Outstanding feature High energy concentric aragonite ooids
Folk Classification Well sorted ooids
Dunham Classification Well sorted ooids
Common Grains Ooids and some quartz
Sorting Well sorted
Rounding Well rounded
Micritization & envelopes A few coated grains
Cement & diagenetic fabric Uncemented
Porosity Unconsolidated sediment, highly porous
Depositional Setting High energy shoal
Diagenetic history Precipitation of aragonite on pellets, grapestones and quartz.
Striking high energy concentric aragonite ooid grains collected where they are forming in the vicinity of the ebb tidal delta north west of Sardyat Island on the Arabian Gulf coast just to the east of Abu Dhabi Island in the United Arab Emirates. Note the empty pores within the ooids that are the product of dissolution induced by boring cyanobacteria (blue-green algae).

Thursday, November 11, 2021
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