pure and applied geophysics

, Volume 70, Issue 1, pp 88–93 | Cite as

The use of a portable fluxgate magnetometer for the estimation in the field of the direction and stability of remanent magnetization of rock specimens

  • J. Sherwood
  • J. H. Watt


A portable magnetometer of the fluxgate type is described, which is capable of measuring in the field the direction and intensity of remanent magnetization of rock samples of 2 cm diameter with an accuracy of the order of 6° for intensities of 10−3 emu/cc or more. The measurement and calculation can be carried out in less than five minutes, and a precision of the order of 2° can be obtained if more readings are taken so that ten minutes are required for a complete measurement. The chief limitation to the precision of measurement was found to be inhomogeneity of magnetization of the specimens. The instrument has been used to estimate stability of natural remanent magnetization where A.C. cleaning apparatus is not available, and the method of doing so is briefly described.


Rock Sample Remanent Magnetization Rock Specimen Natural Remanent Magnetization Complete Measurement 
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  1. [1]
    R. R. Doell andA. Cox,Measurement of natural remanent magnetization at the outcrop, in:Methods in Palaeomagnetism (Elsevier, Amsterdam-London-New York 1967), 159–162.Google Scholar
  2. [2]
    J. H. Watt,The magnetic properties of some basic igneous intrusions, Ph. D. Thesis, University of Birmingham (1966).Google Scholar

Copyright information

© Birkhäuser Verlag 1968

Authors and Affiliations

  • J. Sherwood
    • 1
  • J. H. Watt
    • 2
  1. 1.Geophysics Section, Dept. of GeologyUniversity of BirminghamBirminghamUK
  2. 2.Geophysics Section, Dept. of GeologyUniversity of BirminghamBirminghamUK

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