Ooid Layers Brittle and Break with Compaction - Trias (O/37/Tri/Italy)
| Outstanding feature |
Radial calcitic ooids that interpenetrate |
| Folk Classification |
Bimodal ooidsparite |
| Dunham Classification |
Bimodal oograinstone |
| Common Grains |
Radial ooids |
| Sorting |
Bimodal sorted |
| Rounding |
Well rounded |
| Micritization & envelopes |
Micritized borings within ooids |
| Cement & diagenetic fabric |
Ooids cemented by isopachus bladed rim with equant spar final fill cement |
| Porosity |
Dense, none |
| Depositional Setting |
High energy shoal |
| Diagenetic history |
Interpenetration of ooids and some break |
Radial ooid grains that accumulated on high energy shoal coming from two sources, hence bimodality. Note the way the ooids interpentrate under compaction and also note the small fragments of the ooid cortex (layers) floating in the calcite spar cement.
Thursday, November 11, 2021