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- W21055254 abstract "The central and eastern High Atlas ranges of southern Morocco coincide with a Mesozoic 100 {times} 500-km east-west rift. Upper Triassic to lower Liassic continental red beds, evaporites, and basalts, unconformably overlying Paleozoic metasediments, comprise basin-wide initial synrift deposition. These are abruptly overlain by up to 40 m of Hettangian or lower Sinemurian block, laminated, unfossiliferous limestones deposited in a euxinic hypersaline and/or stratified sea. Continued syndepositional transtension differentiated the embryonic seaway into a mosaic of fault blocks comprising an axial midbasin platform symmetrically flanked to the north and south by turbidite troughs, basin-margin shelves, and shores. The midbasin platform serves as an exposed model for structurally analogous platforms in oil-producing basins such as west Texas. It has a unique Liassic upward-shallowing limestone sequence approximately 450 m thick, now widely exposed by en echelon ridges upthrusted over a minimal axial area of 20 {times} 150 km. The basal laminated euxinic facies (potential source rock) becomes interbedded upward with bioturbated limestones, indicating cyclic presence of normal marine bottom waters. Overlying strata are completely bioturbated nodular limestones with rare diminutive shelled benthos and chert nodules resembling sponge morphologies. The upper 250 m of the sequence exhibit increasing bed thickness, abundance and diversitymore » of shelly benthos, and frequency and size of sponge-algal mud mounds (potential reservoirs), indicating overall shallowing but generally below wave base. The sequence culminates in giant sponge-algal buildups with up to 200 m of relief, abruptly capped by a starved surface rich with ammonites related to a late Liassic (Toarcian) eustatic sea level rise.« less" @default.
- W21055254 created "2016-06-24" @default.
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- W21055254 date "1988-08-01" @default.
- W21055254 modified "2023-09-27" @default.
- W21055254 title "Jurassic midbaisn platform, central and eastern High Atlas Morocco" @default.
- W21055254 hasPublicationYear "1988" @default.
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