Timing and origin of orogenic remagnetizations in Mississippian carbonates, Sawtooth Range, Montana |
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Authors: | VJ O'Brien RD Elmore MH Engel MA Evans |
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Institution: | aSchool of Geology and Geophysics, The University of Oklahoma, Norman, OK 73019, USA;bDepartment of Physics and Earth Sciences, Central Connecticut State University, New Britain, CT 06050, USA |
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Abstract: | Paleomagnetic data and rock magnetic results suggest that a widespread orogenic remagnetization caused a pervasive chemical remanent magnetization (CRM) that resides in magnetite in the Mississippian Madison Group in the Sawtooth Range, Montana, during the Late Cretaceous to Early Tertiary. The CRM is similar to a CRM reported by workers from equivalent units in the southern Canadian Cordillera. The CRM is interpreted to be related to alteration by fluids, and there are two likely fluids: hydrocarbons which migrated into the unit and externally derived radiogenic fluids. |
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Keywords: | Chemical remagnetization Paleomagnetism Thrust fault Orogenic fluids |
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