Syndeformational magnetization in the Ordovician Bigfork Chert at Black Knob Ridge, western Ouachita Mountains, southern Oklahoma

Details Syndeformational magnetization in the Ordovician Bigfork Chert at Black Knob Ridge, western Ouachita Mountains, southern Oklahoma Syndeformational magnetization in the Ordovician Bigfork Chert at Black Knob Ridge, western Ouachita Mountains, southern Oklahoma

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.109..531h&link_type=abstract

Earth and Planetary Science Letters, Volume 109, Issue 3, p. 531-542.

Computer Science

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Scientific paper

Paleomagnetic and rock magnetic results from unweathered samples of the Ordovician Bigfork Chert at Black Knob Ridge in southern Oklahoma indicate the presence of a pervasive magnetization residing in magnetite that has a southeast and steep down direction. The results from small- and medium-scale folds indicate the magnetization was acquired during or after Carboniferous folding. The declination in sites along Black Knob Ridge shows a north to south 28° counter-clockwise shift.The Bigfork Chert at Black Knob Ridge was folded and thrusted along the Ti Valley fault system in the late Paleozoic. The laterally equivalent Viola Limestone in front of the thrust and in the Arbuckle Mountains contains a late Paleozoic magnetization with a shallow inclination that can be used as a reference for comparison with the Bigfork Chert at Black Knob Ridge. Based on the comparison, the steep inclinations in the rocks at Black Knob Ridge are interpreted to be primarily the result of rotation around a horizontal axis as a result of thrusting. The declination change along the ridge is also interpreted to be the result of rotational movements during thrusting.The pervasive magnetization at Black Knob Ridge is interpreted to have been acquired during deformation. The low thermal history of the Bigfork Chert suggests that the pervasive component is a chemical remanent magnetization (CRM), although a strain-related mechanism cannot be definitely ruled out. The CRM may be related to fluid migration through fractures produced during folding and thrusting. Alternatively, anin-situ chemical process not triggered by externally-derived fluids may have caused the remagnetization.

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