Study of ancient magnetic fields recorded in rocks. Correlation to geomagnetic polarity chronology can constrain the age of archaeological and fossil-bearing strata.
magnetization retained as magnetic minerals cool through blocking temperatures in an ambient field. Subsequent alteration, reheating and remagnetization can change the record.
A measured magnetic field component or magnitude after subtraction of a reference field. Source geometry, magnetization direction and observation height affect its sign and amplitude; an anomaly is not a direct map of rock polarity.
A lineated pattern associated with differently magnetized crust formed at a spreading ridge during changes of field polarity. The age-distance relation is set by spreading, while the measured anomaly is a spatially filtered field of the magnetized material.

Ancestors (4)

  1. Geophysics
  2. Branches of physics
  3. Physics
  4. Home

Incoming links (1)

View article source

Discussion (0)

New discussion

There are no discussions about this article yet.

Articles by others on the same topic (0)

There are currently no matching articles.
See all articles in the same topic Create my own version