Abstract
Ultramafic-mafic rocks from Makrirrakhi, Central Greece exhibit features of an original ophiolite sequence which contains depleted mantle material, ultramafic containing partial melt textures and possibly the mafic “pluton” which resulted from the coalescing of these partial melt segregations. Considerable mineralogical variation exists: unzoned olivine crystals range in composition from Fo78–84 (mafics) to Fo88–92 (ultramafics), plagioclases An64–79 (mafics) to An80–90 (ultramafics) and spinel varies from a chromian spinel (ultramafics) to a more aluminous-titaniferous spinel (mafics). Pyroxenes from the ultramafics display a limited range: En89–92 Fs9–8 Wo0–2 (orthopyroxene) and En48–54 Fs1–10 Wo38–50 (clinopyroxene). Mafic rocks display a greater range being richer in ferrosilite En36–65 Fs3–20 Wo33–51. Pyroxenes from within the partial melt segregations have chemical affinities with those from the gabbrotroctolite series. A model of partial melt within the upper mantle, and, a set of criteria to distinguish partial melt textures from cumulate textures, are developed from analytical data and textural evidence.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Auboin, J.: Geosynclines-developments in geotectonics 1, 335 p. Amsterdam: Elsevier 1965
Boudier, F., Nicolas, A.: Fusion partielle gabbroique dans la lherzolite de Lanzo. Schweiz. Mineral. Petrog. Mitt. 52, 39–56 (1972)
Carter, N. L., Ave Lallement H. G.: High temperature flow of dunite and peridotite. Bull. Geol. Soc. Am. 81, 2181–2202 (1970)
Dickey, J. S. (Jr.): Partial fusion products in Alpine type peridotites. Mineral. Soc. Am. Spec. Paper 3, 33–49 (1970)
England, R. N., Davies, H. L.: Mineralogy of ultramafic cumulates and tectonites from Eastern Papua. Earth Planet. Lett. 17, 416–425 (1973)
Green, D. H., Ringwood, A. E.: The genesis of basaltic magmas. Contr. Mineral. and Petrol. 15, 103–190 (1967)
Hakli, T. A.: An attempt to apply the Makaopuhi nickel fractionation data to the temperature determination of a basic intrusive. Geochim. Cosmochim. Acta 32, 449–460 (1968)
Hakli, T. A., Wright, T. L.: The fractionation of nickel betwen olivine and augite as a geothermometer. Geochim. Cosmochim. Acta 31, 877–884 (1967)
Hunahashi, M., Kim, C. W., Ohta, Y., Tsuchiya, T.: Co-existence of plagioclases of different compositions in some plutonic and metamorphic rocks. Lithos 1, 356–373 (1968–1969)
Hynes, A. J.: The geology of part of the Western Othris Mountains, Greece. Unpublished Ph. D. Thesis, University of Cambridge
Jackson, E.: The origin of ultramafic rocks by cumulus processes. Fortschr. Mineral. 48, 128–174 (1971)
Jackson, E., Thayer, T.: Some criteria for distinguishing between stratiform, concentric and alpine peridotite-gabbro complexes. U.S. Geol. Survey. Submitted to the 24th International Geol. Congress Montreal, p 289–296 (1972)
Moores, E., Vine, F.: The Troodos Massif, Cyprus and other ophiolites as oceanic crust: evaluation and implications. Phil. Trans. Eoy. Soc. (London) Ser. A 268, 443–466 (1971)
Poldervaart, A., Hess, H.: Pyroxenes in the crystallization of basaltic magma. J. Geol. 59, 472–489 (1951)
Ringwood, A. E.: Chemical evolution of the terrestial planets. Geochim. Cosmochim. Acta 30, 41–104 (1966)
Smith, A. G.: Alpine deformation and the Oceanic areas of Tethys, Mediterranean and Atlantic. Geol. Soc. Am. Bull. 82, 2039–2070 (1971)
Steuber, A. M.: A geochemical study of ultramafic rocks. University California, San Diego Ph. D. Geology. University Microfilms Inc. Michigan. (1965)
Thayer, T. P.: Peridotite-gabbro complexes as keys to the Petrology of Mid-Oceanic Ridges. Geol. Soc. Am. Bull. 80, 1515–1522 (1969)
Vinogradov, A. P., Yaroshevsky, A. A., Ilyin, N. P.: A physico-chemical model of element separation in the differentiation of mantle material. Phil. Trans. Roy. Soc. (London), Ser. A 268, 409–442 (1971)
Wyllie, P. J.: The dynamic earth: Textbook in Geosciences, 416 p. New York: J. Wiley & Sons. 1971
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Menzies, M. Mineralogy and partial melt textures within an ultramafic-mafic body, Greece. Contr. Mineral. and Petrol. 42, 273–285 (1973). https://doi.org/10.1007/BF00372606
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00372606