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The AAPG/Datapages Combined Publications Database

Oklahoma City Geological Society

Abstract


The Shale Shaker
Vol. 63 (2012), No. 2. (September/October), Pages 124-143

Sedimentology of the Upper Pennsylvanian Bigheart Sandstone Member, Tallant Formation, Pawnee and Osage Counties, Oklahoma

Ruiqian Chen, Robert W. Scott

Abstract

During the later part of the Pennsylvanian Period the southeastern shoreline of the Midcontinent Seaway fluctuated across northeastern Oklahoma as polar ice waxed and waned. The Bigheart Sandstone Member of the Tallant Formation in northeastern Oklahoma was deposited in a major fluvial-estuarine system that headed in the recently uplifted Ouachita Mountains. Its basal contact with the underlying Barnsdall Formation is a previously unrecognized unconformity. This study adds to the knowledge of the processes that deposited a succession of thick sandstones that thin and even pinch out northward onto the Kansas Shelf. Southward these sandstone bodies grade into multistory siliciclastic deposits in the trough formed by the uplift of the Ouachita Mountains. These sandbodies play an important role in understanding the overall paleogeography and how deposition changed from a period of Early Pennsylvanian tectonic activity to a period of later Pennsylvanian relative tectonic quiescence.

Field observations indicate that the Bigheart Sandstone Member in Pawnee and southern Osage Counties was mainly a fluvial deposit. In Osage County, flaser bedding in the upper part of the sandstone suggests that it might transition from fluvial to estuarine environment. Paleocurrent indicators in the Bigheart Sandstone show that transport was mainly to the northwest. Petrographic analyses indicate that the Bigheart Sandstone is a quartz-rich sublitharenite with a high concentration of sedimentary lithic fragments, but with a limited concentration and diversity of heavy minerals. XRD clay-mineral analyses show a high proportion of illite, which suggests that the Bigheart Sandstone was likely influenced by intense chemical weathering. Both paleocurrent direction and petrographic data suggest that Ouachita Mountains were the source of the Bigheart Sandstone.


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