SOME MAGNETIC PROPERTIES OF BORE CORE SEDIMENTS ...

• Main Author: SHI, HUAJUN
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: University of Plymouth 1996
• Subjects: Prudhoe Bay; Alaska
• Online Access: https://dx.doi.org/10.24382/2978; https://pearl.plymouth.ac.uk/handle/10026.1/1782

The first eight chapters of this thesis describe a study of the magnetic effects of drilling on bore cores of sedimentary rocks. Extensive rock and palaeo- magnetic methods were used to investigate such effects in three collections of bore cores from the North Sea and Sellafield, U.K., and Prudhoe Bay, Alaska. It is evident that a drilling imposed remanent magnetisation (DIRM) resides in the North Sea and Prudhoe Bay bore cores which is characterised by symmetries in its intensity and direction relative to the core axis. Such DIRM correlated well with the theoretically modelled magnetic field at one end of a steel drill barrel. The DIRM intensity distribution also appeared to be correlated with variation in the radial remanence susceptibility (i.e. the capacity of remanence acquisition) in the North Sea and Prudhoe Bay cores and magnetic susceptibility in the North Sea cores. Simulation experiments of shock impact conducted on bore core materials suggests that shock/vibration of the drill barrel is the major ...