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A Geochronological Study of the Crystalline Rocks of Charnwood Forest, England

  • M. Y. Meneisy (a1) and J. A. Miller (a1)

Potassium-argon age measurements made on samples of rock from Charnwood Forest and surrounding districts indicate that the porphyroids and syenites probably date from late pre-Cambrian times. The area was affected by both the Caledonian and Hercynianorogenies. A number of the intrusive rocks of the Forest have been shown to date from Caledonian times. A dolerite from the Leicestershire coalfield gave a Permian age.

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S. Allport , 1874. On the Microscopic Structure and Composition of British Carboniferous Dolerites. Quart. J. geol. Soc. Lond., 30, 550.

G. P. Erikson , and J. L. Kulp , 1961. Potassium-argon Measurements on the Palisades Sill, New Jersey. Geol. Soc. Amer. Bull., 72, 649.

R. E. Folinsbee , J. Lipson , and J. H. Reynolds , 1956. Potassium-argon Dating. Geochim. et cosmochim. Acta., 10, 60.

T. D. Ford , 1958. Pre-Cambrian fossils from Charnwood Forest. Proc. Yorks. geol. Soc., 31, 211.

W. Gentner , and W. Kley , 1957. Argonbestirnmungen an Kaliummineralien-IV Die Frage der Argonverluste in Kalifeldspäten und Glimmermineralin. Geochim. et cosmochim. Acta., 12, 323.

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E. Hill , and T. G. Bonney , 1877. The Pre-Carboniferous Rocks of Charnwood Forest. Quart. J. geol. Soc. Lond., 33, 754.

P. M. Jeffery , 1956. The radioactive age of four Western Australian pegmatites by the potassium-argon and rubidium-strontium methods. Geochim. et cosmochim. Acta., 10, 191.

C. Lapworth , 1898. A sketch of the geology of the Birmingham District. Proc. Geol. Ass. Lond., 15, 313428. Charnwood Forest, by W. W. Watts , 323–35, 417–18.

J. A. Miller , and J. D. Mudie , 1961. Potassium-Argon Age Determinations on Granite from the Island of Mahé in the Seychelles Archipelago. Nature, 192, 1174.

H. A. Shillibeer , and K. Watson , 1955'. Some potassium-argon ages for Ontario. Science, 121, 33.

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