Paleomagnetic dating of diagenesis by basinal and meteoric fluids, Ordovician carbonates, Arbuckle Mountains, southern Oklahoma

Conference · Thu Feb 28 23:00:00 EST 1991 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:5677913

Elmore, R D; Bagley, D S; London, D; Nick, K ^[1]

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1. Univ. of Oklahoma, Norman (United States)

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 Liesegang 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 cause by different fluids at apparently different times at several locations in the Arbuckle Mountains.

• OSTI ID: 5677913
• Report Number(s): CONF-910403--
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (United States), Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Vol. 75:3; ISSN AABUD; ISSN 0149-1423
• Country of Publication: United States
• Language: English

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