Multiple magnetization events in the Red River carbonates, Williston Basin, Canada: Evidence for fluid-flow? |
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| Authors: | Erika Szabo Maria T Cioppa |
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| Institution: | aDepartment of Earth Sciences, University of Western Ontario, London, ON, Canada N6A 5B8;bDepartment of Earth Sciences, University of Windsor, Windsor, ON, Canada N9B 3P4 |
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| Abstract: | Samples collected from the Upper Ordovician Red River carbonates in a well at the centre of the Williston Basin revealed two paleomagnetic components with different inclinations, 60.3 ± 3.9° (k = 70.7, N = 12) and 20.4 ± 3.3° (k = 141.2, N = 8), but similar declination values in individual specimens. Inclination-only analysis indicates two possible scenarios for the age of these two magnetizations: in scenario (a) the timing of magnetization happened sometime between Late Ordovician to Devonian; and in scenario (b) there are two different remagnetizations, one that overlaps Pennsylvanian to Permian time while the other can have either a Late Jurassic or a Tertiary age. Whereas dolomitization and some isotopic data tend to support scenario (a), previous paleomagnetic data from the Williston Basin and from younger units in the same well, the tectonic evolution of the basin, and the hydrocarbon maturation pattern in the Red River carbonates all favour chemical remagnetization(s) driven by orogenic fluids during the Alleghenian and Laramide orogenies. |
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| Keywords: | Red River carbonates Paleomagnetism Remagnetization Fluid-flow Williston Basin Upper Ordovician |
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