Abstract
The natural remanent magnetization (NRM) associated with individual oriented grains of the major rock-forming minerals of the Tatoosh granodiorite has been determined to establish the magnetic carriers of stable and unstable components of NRM. In addition, magnetic parameters such as weak field susceptibility, Königsberger ratio, saturation isothermal remanent magnetization and remanent coercivity have been used to characterize the various carriers. The NRM associated with the different rock-forming minerals may be conveniently classified into two types. Type A NRM is carried by fine particles of magnetite, which occur as inclusions in feldspar, especially in plagioclase. It is magnetically hard and has a narrow range of blocking temperatures. Type B NRM is carried by large grains of magnetite associated mostly with biotite and partly with hornblende. It is magnetically soft and contains thermally unstable or viscous components. It appears that in this intrusion the paleomagnetic signal is carried by the fine particles of magnetite, while the coarse particles record poorly and their remanence contributes noise.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call