Depositional History of the Atokan Succession (lower Pennsylvanian) in the Permian Basin
نویسنده
چکیده
Atokan-age units in the Permian Basin record a 2-order transgression, with aerially restricted, lower Atokan fluvial to shallow-marine siliciclastics followed by pervasive carbonate deposition. In general, Atokan-age siliciclastics dominated deposition in the west of the Permian Basin while carbonate deposition dominated throughout the rest of the basin. Predominance of carbonate facies across most of the Permian Basin is due to (1) lack of siliciclastic supply, (2) overall 2-order rising sea level, and (3) progradation of the Upper Marble Falls Formation onto the Eastern Shelf. Progradation was due partly to lower accommodation to the west and backstepping/retreat from encroaching Atokan deltaics to the east. The beginning of the Atokan is marked by a sea-level drop and subsequent lowstand conditions. A sequence boundary separates the Atokan from the underlying Morrowan carbonate section throughout the Permian Basin. Siliciclastic deposition in and around the Permian Basin is more aerially restricted than in the Morrowan. The earliest Atokan lowstand event is manifested in alluvial and fluvial incised-valley sediments in Lea County, New Mexico, and the Broken Bone Graben (Cottle County, Texas); fandelta deposits in the Palo Duro Basin and Taylor Draw field (Upton County, Texas); and
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Depositional History of the Morrowan Succession (lower Pennsylvanian) in the Permian Basin
Morrowan-age units in the Permian Basin appear to show a “second-order” transgression from siliciclastic fluvial-deltaic to shallow-marine and subsequently to carbonate deposition. In general, Morrowan-age siliciclastics dominate deposition in the west of the Permian Basin, while carbonate deposition dominates in the east. The predominance of carbonate facies in the east is due to a lack of sil...
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