Geochemical constraints on the origin of secondary magnetizations in the Cambro-Ordovician Royer Dolomite, Arbuckle Mountains, southern Oklahoma

Details Geochemical constraints on the origin of secondary magnetizations in the Cambro-Ordovician Royer Dolomite, Arbuckle Mountains, southern Oklahoma Geochemical constraints on the origin of secondary magnetizations in the Cambro-Ordovician Royer Dolomite, Arbuckle Mountains, southern Oklahoma

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pepi...85....3e&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 85, Issue 1-2, p. 3-13.

Physics

4

Scientific paper

Geochemical and paleomagnetic results from Cambro-Ordovician Royer Dolomite in the Arbuckle Mountains, southern Oklahoma, suggest a connection between dolomite type and magnetizations. One dolomite type, which is most common in the vicinity of the Arbuckle Anticline, has a dull luminescence, low δ18O values, coeval to slightly lower 87Sr/86Sr ratios and contains an easterly Cambro-Ordovician magnetization in magnetite.
To the southeast, closer to the Ouachita Mountain front, most of the Royer dolomite contains a southeasterly and shallow magnetization in magnetite that is interpreted to be Late Paleozoic in age. In contrast to the other dolomites, these dolomites contain abundant authigenic K-feldspar and pyrite, radiogenic 87Sr/86Sr ratios, and have a bright (red) luminescence, all of which are consistent with alteration by basinal fluids. At one site, a stromatolitic bioherm, dolomites similar to those at the Arbuckle Anticline are surrounded by the altered dolomites. The distribution of specimen directions at this site is streaked between a Cambro-Ordovician and Late Paleozoic direction.
The results of this study suggest a connection, either direct (by causing precipitation) or indirect (by increasing permeabilities for another fluid), between a radiogenic fluid and a chemical magnetization in magnetite. The relatively unaltered dolomites at the stromatolitic bioherm site escaped the almost pervasive alteration and remagnetization caused by the basinal fluids close to the Ouachita Mountains, a potential source for the fluids.

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