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Palaeomagnetism of Late Precambrian or Cambrian diorites from Leicestershire, U.K.

  • B. A. Duff (a1)
Abstract
Summary

Af demagnetization of the Late Precambrian or Cambrian diorites of Leicestershire reveals at least two components of magnetization in sites with stable, coherent NRM. A high remanentcoercivity component yields a palaeomagnetic pole at 141° E 63° N (A959 = 9°) in agreement with results from other Late Precambrian or Cambrian rocks in North Wales and Norway. A softer component may be of recent viscous origin, or have been acquired during Cambrian remagnetization.

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J. C. Briden 1972. A stability index of remanent magnetization. J. geophys. Res. 77, 1401–5.

S. J. Cribb 1975. Rubidium-strontium ages and strontium isotope ratios from the igneous rocks of Leicestershire. Jl geol. Soc. Lond. 131, 203–12.

E. Hill & T. G. Bonney 1878. On the pre-Carboniferous rocks of Charnwood Forest. Q. Jl geol. Soc. Lond. 34, 199239.

R. St J. Lambert & D. C. Rex 1966. Isotopic ages of minerals from the Precambrian complex of the Malverns. Nature, Lond.209, 605–6.

R. P. E. Poorter 1972. Preliminary palaeomagnetic results from the Fen Carbonatite complex, South Norway. Earth Planet. Sci. Lett. 17, 194–8.

G. S. Watson & E. Irving 1957. Statistical methods in rock magnetism. Mon. Not. Roy. Astron. Soc. Geophys. Supp. 7, 289300.

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Geological Magazine
  • ISSN: 0016-7568
  • EISSN: 1469-5081
  • URL: /core/journals/geological-magazine
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