Encyclopedia of Geomagnetism and Paleomagnetism

2007 Edition
| Editors: David Gubbins, Emilio Herrero-Bervera

Magnetization, Natural Remanent (NRM)

  • Mimi J. Hill
Reference work entry
DOI: https://doi.org/10.1007/978-1-4020-4423-6_193
Natural remanent magnetization (NRM) is remanent magnetization that has been acquired naturally (i.e., not artificially acquired in a laboratory). It is the remanent magnetization of a sample (such as rock or baked archaeological material) that is present before any laboratory experiments are carried out. Magnetization is usually measured normalized to either the sample volume (units of A m −1) or sample mass (units of A m 2 kg −1). NRM can consist of one or more types of magnetization depending on the history of the sample. Rock samples that have been exposed to the Earth's magnetic field for many millions of years may have experienced several different processes of magnetization during that time, producing multiple components of magnetization. Components acquired at the time of rock formation are termed primary and later components are termed secondary. The NRM is then the vector sum of all the naturally acquired components of magnetization:
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Bibliography

  1. Butler, R.F., 1992. Paleomagnetism: Magnetic Domains to Geologic Terranes. Boston, MA: Blackwell Science.Google Scholar
  2. Tarling, D.H., 1983. Palaeomagnetism Principles and Applications in Geology, Geophysics and Archaeology. London: Chapman & Hall.Google Scholar

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© Springer-Verlag 2007

Authors and Affiliations

  • Mimi J. Hill

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