Advertisement

Contributions to Mineralogy and Petrology

, Volume 46, Issue 3, pp 233–239 | Cite as

Notes on the petrology of some ophiolites, othris mountains, Greece

  • Andrew Hynes
Article

Abstract

Igneous rocks typical of ophiolite complexes are preserved in a stack of thrust sheets in the Othris Mountains of eastern Greece. Mineralogical studies of mafic rocks indicate that the majority have tholeiitic affinities, but there is evidence of a subordinate, mildly alkaline trend. Petrographic and chemical evidence suggest that the present mineral assemblage in the mafic rocks may be the result primarily of the activity of deuteric or secondary hydrothermal fluids. The “amphibolites” so common in dredge-hauls from the oceans may have originated in the same way. These metamorphic rocks, with perfectly preserved igneous textures, must be distinguished from schistose amphibolites, which also occur on the ocean floors and in ophiolite complexes.

Keywords

Mineral Resource Metamorphic Rock Igneous Rock Mineral Assemblage Hydrothermal Fluid 
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. Aubouin, J.: Geosynclines. Developments in Geotectonics 1 335 p. Amsterdam: Elsevier 1965Google Scholar
  2. Aumento, F., Loncarevic, B. D., Ross, D. I.: Hudson Geotraverse: geology of the Mid-Atlantic Ridge at 45† N. Phil. Trans. Roy. Soc. (London) Ser. A 268, 623–650 (1971)Google Scholar
  3. Bonatti, E., Honnorez, J., and Ferrara, F.: Peridotite-Gabbro-Basalt complex from the equatorial Mid-Atlantic Ridge. Phil. Trans. Roy. Soc. (London), Ser. A 268, 385–402 (1971)Google Scholar
  4. Brown, G. M.: Mineralogy of Basaltic Rocks. In: Hess, H. H., and Poldervaart, A., (eds.), Basalts, the Poldervaart Treatise on Rocks of Basaltic Composition, vol. 1, p. 103–162. John Wiley and Sons 1967Google Scholar
  5. Cann, J. R.: Spilites from the Carlsberg Ridge, Indian Ocean. J. Petrol. 10, 1–19 (1969)Google Scholar
  6. Cann, J. R.: New model for the structure of the ocean crust. Nature 226, 928–930 (1970)Google Scholar
  7. Cann, J. R.: Petrology of basement rocks from Palmer ridge NE Atlantic. Phil. Trans. Roy. Soc. (London). Ser. A 268, 605–617 (1971)Google Scholar
  8. Coleman, R. G.: Low temperature reaction zones and alpine ultramafic rocks of California, Oregon and Washington. Bull. U.S. Geol. Surv. 1247, 1–49 (1967)Google Scholar
  9. Cooms, D. S.: Trends and affinities of basaltic magmas and pyroxenes as illustrated on the diopside-olivine-silica diagram. Spec. Pap. 1, Mineral Soc. Am., 227–250 (1963)Google Scholar
  10. Dachille, F., Roy, R.: Effectiveness of shearing stresses in accelerating solid phase reactions at low temperatures and high pressures. J. Geol. 72, 243–247 (1964)Google Scholar
  11. Hynes, A. J.: Igneous activity at the birth of an ocean basin in eastern Greece. Can. J. Earth Sci. (in press).Google Scholar
  12. Hynes, A. J., Nisbet, E. G., Smith, A. Gilbert, Welland, M. J. P., Rex, D. C.: Spreading and emplacement ages of some ophiolites in the Othris region, eastern central Greece. Proc. 4th Aegean Symposium Hannover. Z. Deutsch. geol. Ges. 123 (1972) Z. Deutsch. geol. Ges.Google Scholar
  13. Melson, W. G., Thompson, G., van Andel, T. H.: Volcanism and metamorphism in the Mid-Atlantic Ridge, 22°N latitude. J. geophys. Res. 73, 5925–2941 (1968)Google Scholar
  14. Menzies, M.: Mineralogy and partial melt textures within an ultramafic-mafic body, Greece. Contr. Mineral. and Petrol. 42, 273–285 (1973)Google Scholar
  15. Miyashiro, A., Shido, F., Ewing, M.: Crystallisation and differentiation in abyssal tholeiites and gabbro from mid-oceanic ridges. Earth and Planetary Science Letters, 7, 361–365 (1970)Google Scholar
  16. Miyashiro, A., Shido, F., Ewing, M.: Metamorphism in the Mid-Atlantic Ridge near 24° and 30° N. Phil. Trans. Roy. Soc. (London), Ser A 268, 589–603 (1971)Google Scholar
  17. Moores, E. M.: Petrology and structure of the Vourinos ophiolitic complex of northern Greece. Spec. Pap. 118, Geol. Soc. Am., 74 p. (1969)Google Scholar
  18. Moores, E. M., Vine, F. J.: The Troodos Massif, Cyprus and other ophiolites as oceanic crust: evaluation and implications. Phil. Trans. Roy. Soc. (London), Ser. A 268, 443–466 (1971)Google Scholar
  19. Rast, N.: The relationship between tectonic deformation and regional metamorphism, Proc. Geol. Soc. (London) 1594, 25–27 (1972)Google Scholar
  20. Vallance, T. G.: Concerning spilites. Proc. Linn. Soc. N. S. W. 85 (1960)Google Scholar
  21. Williams, H. R., Smyth, W. R.: Metamorphic aureoles beneath ophiolite suites and Alpine peridotites: tectonic implications with West Newfoundland examples. Am. J. Sci. 273, 594–621 (1973)Google Scholar
  22. Yoder, H. S., Tilley, C. E.: Origin of basalt magmas. J. Petrol. 3, 346–529 (1962)Google Scholar

Copyright information

© Springer-Verlag 1974

Authors and Affiliations

  • Andrew Hynes
    • 1
  1. 1.Department of Earth and Planetary SciencesErindale College University of TorontoMississaugaCanada

Personalised recommendations