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Cyclic Sedimentation Sequence (Shallowing-Up via Evaporite Precip (2.…
Cyclic Sedimentation Sequence
i.e. Zechstein Basin Evaporite Cycles at Yorkshire deep wells
Evaporite sequence
formed in initially deep, marine barred-basin
with period replenishment
Shallowing-Up via Evaporite Precip
1. Open Marine Basin (Flooding)
Sediments with
normal marine fauna
2. Euxinic Basin
Organic rich muds (sapropels) (little O for decay)
Anhydrite
Organic laminated muds
3. Sabkha -
coastal plain
Anhydrite
4. Playa/salina
(basin interior)
Halite (massive or layered)
Potash salts
Incredibly soluble thus require complete evaporation
Decreasing z
Increasing salinity
Potash Salts
Found in Zechstein last evaporite cycle
Indicates precipitation to completion
very soluble hence require complete evaporation to precipitate
Not found in Med
Last evaporite stage before completely dried up