Microscopic

Skeletal - Halimeda, Molluscs & Corals (B/21/Ple/Eni)

2.5x
5x
5x wave plate
5x
5x wave plate
10x wave plate
Outstanding feature Very porous rock undergoing early marine cementation
Folk Classification Halimeda biosparite
Dunham Classification Halimeda packstone
Common Grains Halimeda, mollusks & foraminifera
Sorting Good
Rounding Well rounded
Micritization & envelopes Thin envelopes on some grains
Cement & diagenetic fabric Circumgranular aragonite cements
Porosity 40% intergranular
Depositional Setting High energy portion of atoll reef
Diagenetic history Marine cementation

Sample collected from 80ft in the XGK-7-3-80 well Eniwetok, Marshall Islands. Halimeda flakes that have undergone marine cementation on the margins of the atoll.


Thursday, August 15, 2019
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