Microscopic

Aragonite Ooids - Meniscus Cements - Botryoidal Grapestones - Holocene (O/8/Hol/Bah)

10x
10x
10x
2.5x
2.5x
20x
20x
5x
5x
5x
5x
5x cross nicol
5x wave plate
5x wave plate
Outstanding feature Meniscus cements & concentric aragonite ooids
Folk Classification Oosparite
Dunham Classification Oolitic grainstone
Common Grains Ooids, & botryoidal grapestones
Sorting Good
Rounding Good
Micritization & envelopes Limited to a few grains
Cement & diagenetic fabric Meniscus low magnesian calcite rims
Porosity 5-7% Interparticle porosity
Depositional Setting Open marine high energy shoal water
Diagenetic history Cemented by vadose freshwater calcite leached from the original aragonite grains

The striking meniscus cements are related to evaporation of freshwater charged with dissolved aragonite within the beach rock forming adjacent to the tidal channel that marks the southern margin of the Joulters Cay. Aragonite ooids with concentric layering of cortex about micritic pelloid nulceae. Botryoidal grains are transported grapestones that form nucleae and are enclosed by aragonite ooid coating. Darkened spots within ooid layers are cyanobacteria colonies that cause local micritization.


Monday, August 27, 2018
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