GEOCHEMISTRY OF ULTRAMAFIC ROCKS FROM THE ULTRAHIGH-PRESSURE METAMORPHIC KIMI COMPLEX IN EAST RHODOPE (NE. GREECE)


I. Baziotis
E. Mposkos
S. Palikari
M. Perraki
Résumé

In the ultrahigh-pressure metamorphic Kimi Complex garnet-spinel metaperidotites with layers of clinopyroxenites occur. A detailed geochemical investigation using major-trace element relations and major-element modelling indicates that the peridotites represent mantle residues originated after variable melt extraction, along an adiabatic path starting from high- to ultrahigh-pressures. The clinopyroxenites represent HP clinopyroxene-rich cumulates probably formed within the garnet and/or Cr-spinel peridotite stability field.

Article Details
  • Rubrique
  • Mineralogy-Petrology-Geochemistry-Economic Geology
Téléchargements
Les données relatives au téléchargement ne sont pas encore disponibles.
Références
Asimow, P.D., 1999. A model that reconciles major- and trace- element data from abyssal peridotites, Earth and Planetary Science Letters, 169, 303-319.
Asimow, P.D., Hirschmann, M.M., and Stolper, E.M., 2001. Calculation of peridotite partial melting from thermodynamic models of minerals and melts. IV. Adiabatic decompression and the composition and mean properties of mid-ocean ridge basalts, Journal of Petrology, 42, 963-998.
Asimow, P.D., Dixon, J.E., and Langmuir, C.H., 2004. A hydrous melting and fractionation model for mid-ocean ridge basalts: Application to the Mid-Atlantic Ridge near the Azores, Geochemistry Geophysics Geosystems, 5, art. no. Q01E16, DOI: 10.1029/2003GC000568.
Bulatov, V.K., Girnis, A.V., and Brey, G.P., 2002. Experimental melting of a modally heterogeneous mantle, Mineralogy and Petrology, 75, 131-152.
Frey, FA., Suen, C.J., and Stockman, H.W., 1985, The Ronda high temperature peridotite: Geochemistry and petrogenesis, Geochimica et Cosmochimica Acta, 49, 2469-2491.
Hermann, J., Rubatto, D., and Trommsdorff, V. 2006. Sub-solidus Oligocene zircon formation in garnet peridotite during fast decompression and fluid infiltration (Duria, Central Alps), Mineralogy and Petrology, 88, 181-206.
Hirose, K., and Kushiro, I., 1993. Partial melting of dry peridotites at high pressures: determination of compositions of melts segregated from peridotite using aggregates of diamond, Earth and Planetary Science Letters, 114, 477-489.
Kelemen, P.B., Hart, S.R., and Bernstein, S., 1998. Silica enrichment in the continental upper mantle via melt/rock reaction, Earth and Planetary Science Letters, 164, 387-406.
Krohe, Α., and Mposkos, E., 2002. Multiple generations of extensional detachments in the Rhodope Mountains (N.Greece): evidence of episodic exhumation of high-P rocks. In D.J.
Blundell, G. Neubauer and A. Von Quant (eds), The timing and location of major ore deposits in an evolving orogen. Geol. Soc. Sp. Pubi., London, 204, 151-178.
Liati, Α., Gebauer, D., and Wysoczanski, R., 2002. U-Pb SHRIMP-dating of zircon domains from UHP mafic rocks in the Rhodope zone (NvGreece); evidence for Early Cretaceous crystallization and Late Cretaceous metamorphism, Chemical Geology, 184, 281-300.
Liu, Y., Gao, S., Aeolus Lee, C.-T., Hu, S., Liu, X., and Yuan H., 2005. Melt-peridotite interactions: Links between garnet pyroxenite and high-Mg# signature of continental crust, Earth and Planetary Sciences Letters, 234, 39-57.
Mposkos, E., and Wawrzenitz, N., 1995. Metapegmatites and pegmatites bracketing the time of HP-metamorphism in polymetamorphic rocks of the E-Rhodope: Petrological and geochronological constraints, XV Con of the Carpatho-Balkan Geol. Assoc. Geol. Soc. Sp. Pubi, Greece, 2, 602-608.
Mposkos, E., and Krone, Α., 2006. Pressure-Temperature-deformation paths of closely associated ultra-high-pressure (diamond-bearing) crustal and mantle rocks of the Kimi Complex: implications for the tectonic history of the Rhodope Mountains, northern Greece, Canadian Journal of Earth Sciences, 43, 1755-1776.
Navon, O., and Stolper, E., 1987. Geochemical consequence of melt percolation: the upper mantle as a chromatographic column, Journal of Geology, 95, 285-307.
Niu, Y., 1997. Mantle melting and melt extraction processes beneath ocean ridges: Evidence from abyssal peridotites, Journal of Petrology, 38, 1047-1074.
Pearson, D.G., Davies, G.R., and Nixon, P.H., 1993. Geochemical constraints on the petrogenesis of diamond Facies Pyroxenites from the Beni Bousera Peridotite Massif, North Morocco, Journal of Petrology, 34, 125-172.
Perraki, M., Proyer, Α., Mposkos, E., Kaindl, R., and Hoinkes, G., 2006. Raman microspectroscopy on diamond, graphite and other carbon polymorphs from the ultrahighpressure metamorphic Kimi Complex of the Rhodope Metamorphic Province, NE Greece, Earth and Planetary Science Letters, 241, 672-685.
Rampone, E., and Morten, L., 2001. Records of crustal metasomatism in the garnet peridotites of the Ulten Zone (Upper Austroalpine, Eastern Alps), Journal of Petrology, 42, 207-219.
Ricou, L.E., Burg, J.P., Godfriaux, I., and Ivanov, Z., 1998. Rhodope and Vardar: the metamorphic and olistostromic paired belts related to Cretaceous subduction under Europe, Geodynamica Acta, 11,285-309.
Scambelluri, M., Hermann, J., Morten, L., and Rampone, E., 2006. Melt-versus fluid-induced metasomatism in spinel to garnet wedge peridotites (Ulten Zone, Eastern Italian Alps): clues from trace element and Li abundances, Contributions to Mineralogy and Petrology, DOI: 10.1007/s00410-006-0064-9.
Sun, S.S., and McDonough, W.F., 1989. Chemical and isotopie systematics of oceanic basalts: implications for mantle composition and process. In A.D. Saunders and J.M. Norry (eds), Magmatism in Ocean Basins. Geol. Soc. Sp. Pubi., London, 42, 313-345.
Wawrzenitz, N., and Mposkos, E., 1997. First evidence for lower Cretaceous HP / HTmetamorphism in the Eastern Rhodope, North Aegean Region, North-East Greece, European Journal of Mineralogy, 9, 659-664.
Xu, Y.G., 2002. Evidence for crustal components in the mantle and constraints on crustal recycling mechanisms: pyroxenite xenoliths from Hannuoba, North China, Chemical Geology, 182, 301-322.
Xu, Y.G., Sun, M., Yan, W., Liu, Y., Huang, X.L., and Chen X.M., 2002. Xenolith evidence for polybaric melting and stratification of the upper mantle beneath South China, Journal of Asian Earth Sciences, 20, 937-954.
Yu, J.-H., CTReilly, S.Y., Zhang, M., Griffin, W.L., and Xu, X., 2006. Roles of melting and metasomatism in the formation of the lithospheric mantle beneath the Leizhou peninsula, South China, Journal of Petrology, 47, 355-383.
Articles les plus lus par le même auteur ou la même autrice