• Paleomagnetism
  • Pertaining to the use of remnant magnetic signatures within the rocks of the Earth's crust to determine the state of the Earth's magnetic field at a given time into the past, or to locate a paleocontinent on the surface of the Earth.
Abstract from DBPedia
    Paleomagnetism (or palaeomagnetism in the United Kingdom) is the study of the record of the Earth's magnetic field in rocks, sediment, or archeological materials. Magnetic minerals in rocks can lock-in a record of the direction and intensity of the magnetic field when they form. This record provides information on the past behavior of Earth's magnetic field and the past location of tectonic plates. The record of geomagnetic reversals preserved in volcanic and sedimentary rock sequences (magnetostratigraphy) provides a time-scale that is used as a geochronologic tool. Geophysicists who specialize in paleomagnetism are called paleomagnetists. Paleomagnetists led the revival of the continental drift hypothesis and its transformation into plate tectonics. Apparent polar wander paths provided the first clear geophysical evidence for continental drift, while marine magnetic anomalies did the same for seafloor spreading. Paleomagnetic data continues to extend the history of plate tectonics back in time as it can be used to constrain the ancient position and movement of continents and continental fragments (terranes). Paleomagnetism relied heavily on new developments in rock magnetism, which in turn has provided the foundation for new applications of magnetism. These include biomagnetism, magnetic fabrics (used as strain indicators in rocks and soils), and environmental magnetism.

    古地磁気学(こちじきがく、英語: paleomagnetism)とは、岩石などに残留磁化として記録されている過去の地球磁場(地磁気)を分析する地質学の一分野。火山岩や堆積岩には、それができた時のできた場所の磁場が記録されており、それを分析することで、地磁気の逆転や大陸移動の様子などを調べることができる。


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