Microscopic

Micrite Cement with Halimeda, Echinoid Overgrowths & Forams (Mic/3/Pl/Fla)

2.5x cross nicols
5x
5x cross nicols
2.5x
2.5x cross nicols
2.5x
Outstanding feature Foraminifera, halimeda, vermiculid gastropods cemented by micrite
Folk Classification Poorly washed biomicrite
Dunham Classification Bioclastic wackestone
Common Grains Foraminifera, halimeda and vermiculid gastropods
Sorting  Poor
Rounding  Little
Micritization & envelopes Some alteration of the margins of bioclasts
Cement & diagenetic fabric Micrite
Porosity 25% interparticle and intraparticle
Depositional Setting Low energy proteced area in reef
Diagenetic history Early disolution of some of aragonite, eg Halimdeda.

This fabric is typical of a cemented reef fabric. The high energy grains accumulated in a very low energy setting within the reefs which was exposed to marine waters and then freshwater diagenesis.


Thursday, August 15, 2019
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