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Palaeomagnetic dating of hydrothermal alteration in the Woodford Shale, Oklahoma, USA

Published online by Cambridge University Press:  06 June 2019

Jennifer Roberts
Affiliation:
Chesapeake Energy, Oklahoma City, Oklahoma 73118, USA
Gerhard Heij
Affiliation:
School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019USA
R. Douglas Elmore*
Affiliation:
School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019USA
*
*Author for correspondence: R. Douglas Elmore, Email: delmore@ou.edu

Abstract

An oriented Woodford Shale core from the eastern Ardmore Basin was sampled to test if the shale was an open or closed system to hydrothermal fluids, and to determine the timing of alteration. Mineralized fractures are ubiquitous in the core, and the shale exhibits a complex paragenesis with multiple hydrothermal minerals, including biotite, magnesite, norsethite, gorceixite and potassium feldspar present in and around the fractures. These minerals suggest that the Woodford Shale was an open system during part of its diagenetic history. Vitrinite reflectance (Ro) measurements indicate values of ∼1.81 % (∼230 °C). Palaeomagnetic analysis reveals a characteristic remanent magnetization (ChRM) with south-southeasterly declinations and shallow inclinations that resides in magnetite. This ChRM is interpreted to be either a chemical remanent magnetization (CRM) or a thermochemical remanent magnetization (TCRM) that was acquired at 245 ± 10 Ma during Late Permian time based on the pole position (51.0° N, 115.6° E). Because the palaeomagnetic specimens show evidence of extensive hydrothermal alteration, the CRM/TCRM is interpreted to date the migration of hydrothermal fluids through the shale. The agreement in timing with other studies that report hydrothermal alteration in southern Oklahoma and the Ouachita Mountains in Late Permian time, suggest that there were post-collisional fluid-flow events which accessed reservoirs of warm fluids.

Type
Original Article
Copyright
© Cambridge University Press 2019 

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