Microscopic

Ooids ( O/1/ )

2.5x
2.5x cross nicols
2.5x wave plate
5x
5x wave plate
5x
5x wave plate
10x
10x wave plate
10x
10x
Outstanding feature High energy radial ooids & quartz - in with thin isopachus and equant cement
Folk Classification Well sorted quartzose oosparite
Dunham Classification Well sorted quartzose oograinstone
Common Grains Ooids, &quartz
Sorting Well sorted
Rounding Well rounded
Micritization & envelopes A few coated grains
Cement & diagenetic fabric Isopachus cement, interpenetration of ooids before final passive equant spar
Porosity None
Depositional Setting High energy shoal
Diagenetic history Freshwater isopachus cement
Striking high energy ooid grains within spar cement matrix. Radial calcitic ooid cortex is concentricly layered about nucleae of both quartz and micritic pelloids. Darkened spots within ooid layers and micrite envelopes are cyanobacteria colonies that caused local micritization when high energy grains came to rest in this setting. In some parts of thin section common points of contact between ooids show some interpenetration and disolution at ooid grain boundaries.

Monday, August 27, 2018
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