Microscopic

Ooids ( O/5/Hol/SH.B. )

2.5x
5x
10x
2.5x
5x
Outstanding feature High energy concentric aragonite ooids
Folk Classification Well sorted oosparite
Dunham Classification Well sorted oolitic grainstone
Common Grains Ooids, some quartz and bioclastic grains
Sorting Well sorted
Rounding Well rounded
Micritization & envelopes A few coated grains
Cement & diagenetic fabric Meniscus cements at grains contacts
Porosity 55% intergranular porosity
Depositional Setting Beach rocks along the high energy shoreline associated with algal stromatolite heads
Diagenetic history Precipitation of aragonite on pellets, grapestones, bioclasts and quartz, followed by calcitic meniscus cements
Striking high energy concentric aragonite ooid grains accumulated where they now form beach rocks along the shore of Hamilin Pool of Shark Bay, Western Australia, between intertidal algal stromatolite heads. Note the meniscus cements forming at the points of contact between the grains.

Monday, August 27, 2018
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