ON THE METAMORPHIC MODIFICATION OF CR-SPINEL COMPOSITIONS FROM THE ULTRABASIC ROCKS OF THE PINDOS OPHIOLITE COMPLEX (NW GREECE)
Published:
Jan 1, 2007
Keywords:
hydrothermal alteration spinel magnetite ferrian chromite peridotite Greece
Abstract
Serpentinites and serpentinised ultramafic rocks from the Pindos ophiolite complex, northwestern Greece, contain Cr-spinel grains that are usually altered. The extent of alteration differs among Cr-spinels and two alteration trends can be distinguished. The most dominant is characterised by Cr-spinel overgrown by Cr-magnetite, while the second shows gradual replacement of Cr-spinel by ferrian chromite locally combined with Cr-magnetite development. Compared to cores, the altered rims are enriched in Fe and show elevated Cr# in both types of alteration, while they are impoverished in Mg and Al only at the second one. The common association of Crmagnetite with serpentine and ferrian chromite with chlorite provides insights to the metamorphic context of their formation through processes that include metasomatism by cation diffusion exchange
Article Details
- How to Cite
-
Kapsiotis, A., Tsikouras, B., Grammatikopoulos, T., Karipi, S., & Hatzipanagiotou, H. (2007). ON THE METAMORPHIC MODIFICATION OF CR-SPINEL COMPOSITIONS FROM THE ULTRABASIC ROCKS OF THE PINDOS OPHIOLITE COMPLEX (NW GREECE). Bulletin of the Geological Society of Greece, 40(2), 781–793. https://doi.org/10.12681/bgsg.16719
- Section
- Mineralogy-Petrology-Geochemistry-Economic Geology
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution Non-Commercial License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g. post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal. Authors are permitted and encouraged to post their work online (preferably in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work.
Downloads
Download data is not yet available.
References
Abzalov, M.Z., 1998. Chrome-spinels in gabbro-wehrlite intrusions of the Pechenga area, Kola Peninsula, Russia: emphasis on the alteration features, Lithos, 43, 109-134
Barnes, S.J., 2000. Chromite in Komatiites, II. Modification during Greenschist to Mid-Amphibolite Facies Metamorphism, Journal of Petrology, Ari, 387-409.
Burkhard, D.J.M., 1993. Accessory chromium spinels: Their coexistence and alteration in serpentinites, Geochimica et Cosmochimica Acta, 57, 1297-1306.
Bidyananda, M., and Mitra, S., 2004. Room temperature 57Fe Mossbauer characteristics of chromites from the Nuggihalli schist belt, Dharwar craton, soythern India, Current Science, 86, 1293-1297.
Cameron, W.E., Nisbet, E.G., and Dietrich, V.J., 1979. Boninites, komatiites and ophiolitic basalts, Nature, 280, 550-553.
Christodoulou, C., and Michaelides, Κ., 1990. Petrology of the plutonic suites from the Chalkidiki ophiolites, Northern Greece. Implications for parental magma characteristics and tectonic provenance, Ofioliti, 15, 17-44.
Christofides, G., Thimiatis, G., Koroneos, Α., Sklavounos, S., and Eleftheriadis, G., 1994 Mineralogy and Chemistry of Cr-chlorites Associated with Chromites from Vavdos and Vasilika Ophiolite Complexes (Chalkidiki, Macedonia, N. Greece), Chemie de Erde, 54, 151-166.
Deer, W.A., Howie, R.A., and Zussman, J., 1992. An introduction to The Rock-Forming Minerals, Longman, Essex, England, 696.
Dick, H.J., and Brayan, W.B., 1979. Variation of basalt phenocryst mineralogy and rock composition in DSDP hole 396B, Initial Reports DSDP, 46, 215-225.
Dick, H.J., and Bullen T., 1984. Chromian spinel as a petrogenetic indicator in abyssal and alpine type peridotite and spatially associated lavas, Contributions to Mineralogy and Petrology, 86, 54-76.
Dietrich, V.J., Oberhaensli, R., and Mercolli, I., 1987. A new occurrence of boninite from the ophiolitic melange in the Pindus - Sub-Pelagonian zone S. L. (Aegina Island, Saronic gulff, Greece), Ofioliti, 12, 83-90.
Economou-Eliopoulos, M., and Vacondios, I., 1995. Geochemistry of chromitites and host rocks from the Pindos ophiolite complex, northwestern Greece, Chemical Geology, 122, 99-108.
Economou-Eliopoulos, M., Tarkian, M., and Sambanis, G., 1999. On the geochemistry of chromitites from the Pindos Ophiolite Complex, Greece, Chemie der Erde, 59, 19-31.
Farahat, E.S., 2006. Crome-spinels in serpentinites and talc carbonates of the El Ideid-El Sodmein District, central Eastern Desert, Egypt: their metamorphism and petrogenetic implications, Chemie der Erde Geochemistry, Article in Press.
Fleet, M.E., 1993. Oriented chlorite lamellae in chromite from the Pedra Branca Mafic-Ultramafic Complex, Ceara, Brazil, American Mineralogist, 78, 68-74.
Hellebrand, E., Snow, J.E., Dick, H.J.B., and Hofmann, A.W., 2001. Coupled major and trace elements as indicator of the extent of melting in mid-ocean-ridge peridotites, Nature, 410, 677-681.
Hey, M.H., 1954. A new review on the chlorites, Minerals Magazine, 224, 277-298.
Hoogerduijn-Strating, E.H., Rampone, E., Piccardo, G.B., Drury, M.R., and Vissers, R.L.M., 1993. Subsolidus emplacement of mantle peridotites during incipient oceanic rifting and opening of the Mesozoic Tethys (Voltri Massif, NW Italy), Journal of Petrology, 34, 901-927.
Irvine, T.N., 1965a. Chromian spinel as a petrogenetic indicator. Part I. Theory, Canadian Journal of Earth Sciences, 2, 648-672.
Irvine, T.N., 1965b. Chromian spinel as a petrogenetic indicator. Part II. Petrogenetic applications, Canadian Journal of Earth Sciences 4, 72-103.
Jones, G., and Robertson, A.H.F., 1991. Tectono-stratigraphy and evolution of the Mesozoic Pindos ophiolite and related units, northwestern Greece, Journal of the Geological Society of London, 148, 267-288.
Kimball, K.L., 1990. Effects of hydrothermal alteration on the compositions of chromian spinels, Contributions to Mineralogy and Petrology, 105, 337-346.
McEdulff, B., and Stumpft, E.F., 1991. Platinum-Group Minerals from the Troodos Ophiolite, Cyprus, Mineralogy and Petrology, 42, 211-232.
Mellini, M, Rumori, C, and Viti, C, 2005. Hydrothermally reset magmatic spinels in retrograde serpentinites: formation of "ferritchromit" rims and chlorite aureoles, Contributions to Mineralogy and Petrology, 149, 266-275.
Menzies, J-C.C, and Nicolas, Α., 1975. Spinel compositional variation in the crustal and mantle lithologies of the Othris Ophiolite, Contributions to Mineralogy and Petrology, 51, 303-309.
O'Hanley, D.S., 1996. Serpentinites Records of Tectonic and Petrological History, Oxford University Press, Oxford, New York, 277pp.
O'Hanley, D.S., 1993. The composition of lizardite IT and the formation of magnetite in serpentinites, American Mineralogist, 78, 391-404.
Pearce, J.A., Lippard, S.J., and Roberts, S., 1984b. Characteristics and tectonic significance of supra-subduction zone ophiolites. In B.P. Kokelaar and M.F. Howells (eds), Marginal Basin Geology, Geol. Soc. Lond. Spec. Pubi., 16, 77-94pp.
Pe-Piper, G., Tsikouras, B., and Hatzipanagiotou, K., 2004. Evolution of boninites and island-arc tholeites in the Pindos Ophiolite, Greece, Geological Magazine, 141, 455-469.
Piccardo, G.B., Muntener, O., Zanetti, Α., Romairone, Α., Bruzzone, S., Poggi, E., and Spagnolo, G., 2004. The Lanzo South peridotite: melt/peridotite interaction in the mantle lithosphere of the Jurassic Ligurian Tethys, Ofioliti, 29, 37-62.
Quick, J.E., 1981a. Petrology and petrogenesis of the Trinity peridotite, an upper mantle diaper in the eastern Klamath Mountains, northern California, Journal of Geophysical Research, 86, 11837-11863.
Rassios, Α., 1991. Internal structure and Pseudo-stratigraphy of the Dramala Peridotite, Pindos Ophiolite, Greece, IGME-EEC project "Tectonic controls on chrome ore localization in ophiolites, Greece", 78-107.
Rassios, Α., and Smith, A.G., 2000. Constraints on the formation and emplacement age of the western Greek ophiolites (Vourinos, Pindos and Othris) inferred from deformation structures in peridotites, Geological Society of America Special Papers, 349, 473-483.
Spray, J.G., and Roddick, J.Ç., 1980. Petrology and 40Ar/39Ar Geochronology of Some Hellenic Sub-Ophiolite Metamorphic Rocks, Contributions to Mineralogy and Petrology, 72, 43-55.
Thalhammer, O.A.R., Prochaska, W., and Muhlhans, H.W., 1990. Solid inclusions in chromespinels and platinum group element concentrations from the Hochgrossen and Kraubath ultramafic massifs (Austria): Their relationships to metamorphism and serpentinisation, Contributions to Mineralogy and Petrology, 105, 66-80.
Vannucci, R., Rampone, E., Piccardo, G.B., Ottolini, L., and Bottazzi, P., 1993. Ophiolitic magmatism in the Ligurian Tethys: An ion microprobe study of basaltic clinopyroxenes, Contributions to Mineralogy and Petrology, 115, 123-137.
Whitechurch, H., and Parrot, J.F., 1978. Ecailles métamorphiques infraperidotiques dans le Pinde septentrional (Grece): croûte océanique, métamorphisme et subduction, CR Acad. Sci. Paris, 286, 1491-1494.
