Eclogites

  • Helmut G. F. Winkler
Part of the Springer Study Edition book series (SSE)

Abstract

Eclogites are rocks of gabbroic-basaltic composition and consist primarily of two minerals: a grass-green clinopyroxene called omphacite and a red or red-brown garnet. In spite of the basaltic composition, plagioclase does not occur in eclogites. Petrogenetically, this is very significant. Eskola attributed the origin of eclogites to very high pressures, and this suggestion has been substantiated by modern experimental work. Eskola also established an “eclogite facies.” However, eclogite zones cannot be mapped in metamorphic terrains. Eclogites are usually encountered as bands or lenses in metamorphic complexes of different grades: in the granolite zone, [almandine]-high-grade and [almandine]-medium-grade, low-grade, and [glaucophane-lawsonite]-very-low-grade. Eclogites also occur as inclusions in kimberlites and basalts and as bands and layers in dunites and peridotites. In some localities, they appear to have been technically squeezed into an alien environment. Eclogites therefore occur in a wide range of environments, as has been pointed out, among others, by Smulikowski (1964).

Keywords

Metamorphic Rock Mole Percent Kimberlite Pipe Compositional Field Basaltic Composition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Angel, F. 1957. Neues Jahrb. Mineral. Abhand. 91: 151–192Google Scholar
  2. Banno, S. and Matsuie, Y. 1965. Proc. Jap. Acad. 41: 716–721.Google Scholar
  3. Bearth, P. 1966. Schweiz. Mineral. Petrog. Mitt. 46: 12–23.Google Scholar
  4. Binns, R. A. 1967. J. Petrol. 8: 349–371.CrossRefGoogle Scholar
  5. Chappell, B. W. and White, A. J. R. 1970. Mineral Mag. 37: 555–560.CrossRefGoogle Scholar
  6. Clark, J. R. and Papike, J. J. 1968. Am. Min. 53: 840–868.Google Scholar
  7. Coleman, R. G., Beatty, L. B., and Brannock, W. W. 1965. Geol. Soc. Am. Bull. 76: 483–508.CrossRefGoogle Scholar
  8. Eskola, P. 1939. In Barth, Correns, and Eskola, Die Entstehung der Gesteine. Springer-Verlag, Berlin.Google Scholar

Copyright information

© Springer Science+Business Media New York 1979

Authors and Affiliations

  • Helmut G. F. Winkler
    • 1
  1. 1.Institute of Mineralogy and PetrologyUniversity of GöttingenFederal Republic of Germany

Personalised recommendations