--> ABSTRACT: Late Paleozoic Migration of Basinal Fluids in the Basal Cambrian Aquifer, Arbuckle Mountains, Southern Oklahoma, by Teree Campbell, Glenn Bixler, Aditya Kar, R. Douglas Elmore; #91020 (1995).

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Late Paleozoic Migration of Basinal Fluids in the Basal Cambrian Aquifer, Arbuckle Mountains, Southern Oklahoma

Teree Campbell, Glenn Bixler, Aditya Kar, R. Douglas Elmore

Models for basinwide flow of orogenic/basinal fluids commonly relay on basal aquifers in the sedimentary section as important fluid pathways. Paleomagnetic and geochemical results from the Reagan Sandstone (Late Cambrian), the basal aquifer in the Paleozoic section, and the underlying Middle Cambrian Colbert Rhyolite Porphyry (525 Ma) provide information on the fluid pathways, the nature of the fluids, and the timing of migration in the Arbuckle Mountains. Samples of relatively unaltered Colbert rhyolite contain a magnetization that resides in magnetite and a fold test suggests the magnetization could be primary. The pole position for this magnetization plots close to poles from other units of similar age. In contrast, an altered zone at the top of the rhyolite and rhyoli e clasts in the Reagan Sandstone contain a magnetization that resides in hematite. A conglomerate test indicates that this magnetization is secondary and a fold test suggests that it is synfolding and Late Paleozoic in age. This magnetization is interpreted as chemical in origin and related to migration of fluids which altered the conglomerate as well as the top of the rhyolite. Geochemical investigations are currently underway to determine the nature of the fluids and if they are related to basinal fluids which moved through the overlying Ordovician carbonate s and caused geochemical alteration as well as acquisition of Late Paleozoic chemical magnetizations around the conduits for flow.

AAPG Search and Discovery Article #91020©1995 AAPG Annual Convention, Houston, Texas, May 5-8, 1995