--> Abstract: Paleomagnetic Dating of Diagenesis by Basinal and Meteoric Fluids, Ordovician Carbonates, Arbuckle Mountains, Southern Oklahoma, by R. D. Elmore, D. S. Bagley, D. London, and K. Nick; #91004 (1991)

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Paleomagnetic Dating of Diagenesis by Basinal and Meteoric Fluids, Ordovician Carbonates, Arbuckle Mountains, Southern Oklahoma

ELMORE, R. DOUGLAS, D. S. BAGLEY, D. LONDON, and K. NICK, University of Oklahoma, Norman, OK

Late Paleozoic chemical magnetizations can be directly related to migration of basinal fluids and exposure to meteoric fluids in Ordovician carbonates in the Arbuckle Mountains. The Viola Formation contains a pervasive synfolding (Pennsylvanian) magnetization residing in magnetite, but, around some mineralized fractures and veins, there are alteration halos that contain a Late Permian chemical magnetization residing in hematite. The veins contain calcites and associated MVT minerals that formed from fluids which were radiogenic, relatively warm, and saline. These fluids caused the alteration and acquisition of the chemical magnetization. The origin of the synfolding magnetization is not well constrained and preliminary studies suggest it is not related to basinal fluids. Hematite Lies gang bands around calcite-filled fractures in dolomitic beds in the Kindblade Formation contain an apparent Early Permian chemical magnetization whereas unbanded rock contains a weak and unstable magnetization. Fluids, probably basinal in origin, which emanated from the fractures, caused the hematite banding and acquisition of the chemical magnetization. In contrast, field relations and geochemical studies indicate that the Royer Dolomite and clasts of the Royer in the Pennsylvanian Collings Ranch Conglomerate contain a Permian magnetization which was acquired as a result of exposure to meteoric fluids. Although all the chemical magnetizations in these carbonates are related to orogeny, they were caused by different fluids at apparently different times at several locations in the Arbuckl Mountains.

 

AAPG Search and Discovery Article #91004 © 1991 AAPG Annual Convention Dallas, Texas, April 7-10, 1991 (2009)