MAGMA GENERATION AND MIXING IN THE EARLIEST VOLCANIC CENTRE OF SANTORINI (AKROTIRI PENINSULA). MINERAL CHEMISTRY EVIDENCE FROM THE AKROTIRI PYROCLASTICS

PDF
Published: Jan 1, 2010
DOI: https://doi.org/10.12681/bgsg.11669
Keywords:
pyroclastics plagioclase Fe-Ti oxides mineral chemistry magma mixing Santorini Greece
K. Kitsopoulos
Abstract

Santorini is a dominant expression of magma generation and subsequent volcanism in the Meditereanean area, where a calk-alkaline, high-alumina, basalt-andesite-dacite type of volcanism was expressed from eight centres. The volcanics of the Akrotiri peninsula are considered to be the products of the earliest (Pliocene Pleistocene) volcanic centre. The present study has investigated the mineral chemistry of some major pyrogenic phenocrysts, such as plagioclase and Fe-Ti oxides, of the Akrotiri pyroclatics unit, which have undergone a notable zeolitization procedure. The results are compatible with magma mixing mechanism of a primitive mantle derived, saturated, of mafic composition component with silicic magma in shallow crustal depths.

Article Details
  • Section
  • Petrology and Mineralogy
Creative Commons License

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
Anderson, A.T., 1983. Oscillatory zoning of plagioclase: Nomarski interference microscopy of etched
polished sections. American Mineralogist 68, 125-129.
Bailey, J.C., Jensen, E.S., Hansen, A., Kann, A.D.J., & Kann, K., 2009. Formation of heterogeneous magmatic
series beneath North Santorini, South Aegean island arc. Lithos 110, 20-36.
Bathrellos,G.D., Vasilatos, C., Skilodimou, H.D., & Stamatakis, M.G., 2009. On the occurrence of a
pumice-rich layer in Holocene deposits of western Peloponnesus, Ionian Sea, Greece. A geomorphological
and geochemical approach. Central European Journal of Geosciences 1, 19-32
Clark, A.H., Pearce, T.H., Roeder, P.L., & Wolfson, I., 1986. Oscillatory zoning and other microstructures
in magmatic olivin and augite: Nomarski interference contrast observations on etched polished surfaces.
American Mineralogist 71, 734-741.
Davis, E., Gartzos, E., & Dietrich, V.J., 1998. Magmatic Evolution of the Pleistocene Akrotiri Volcanoes.
In Casale, R. et al (eds), Proceedings of the 2nd workshop, “The European Laboratory Volcanoes”,
Santorini, 2-4 May 2-4 1996, 49-68.
Dietrich, V.J., Davis, E., & Gartzos, E., 1998. Amphibole in rhyodacites and dacites from the Akrotiri volcanoes
and the complexities of discontinuous fractional crystallization. In Casale, R. et al (eds), Proceedings
of the 2nd workshop, “The European Laboratory Volcanoes”, Santorini, 2-4 May 2-4 1996,
-80.
Druitt, T.H., Edwards, L., Mellors, R.M., Pyle, D.M., Sparks, R.S.J., Lanphere, M., Davies, M., & Barriero,
B., 1999. Santorini Volcano, Geological Society, London, Memoirs, 19, 165pp.
Fouque, F., 1879. Santorin et ses Eruptions, Paris, G. Masson, 440pp.
Huijsmans, J.P.P., Barton, M., & Salters, V.J.M., 1988. Geochemistry and evolution of calc-alkaline volcanic
complex of Santorini, Aegean Sea, Greece. Journal of Volcanology and Geothermal Research
, 283–306.
Karberg, S., & Burton, M., 2006. Oxygen fugacities of mafic magmas erupted in the Santorini volcanic
field, Aegean Sea, Greece. GSA Abstracts with Programs 38 (7), Paper No. 183-13, p. 447.
Kitsopoulos, K.P., 1995. The mineralogy, geochemistry, physical properties and possible industrial applications
of volcanic zeolitic tuffs from Santorini and Polyegos islands, Greece, University of Leicester,
PhD Thesis, 442pp.
Kitsopoulos, K.P., 1996. Zeolitization of the Akrotiri pre-caldera pyroclastics from Santorini island,
Greece. Implications for existing zeolitization models as applied with volcaniclastic materials, GSA
Abstracts with Programs 28 (7), A-104.
Kitsopoulos, K. P., Scott, P.W., Jeffrey, C.A., and Marsh, N.G,, 2001. The mineralogy and geochemistry
of zeolite-bearing volcanics from AkrotiriI (Santorini island) and Polyegos (Milos group of islands)
Greece. Implications for geochemical classification diagrams. Bulletin of the Geological Society of
Greece XXXIV/3, Proceedings of the 9th International Congress, Athens, 859-865.
Mitropoulos, P., & Tarney, J., 1992. Significance of mineral composition variations in the Aegean Island
Arc, Journal of Volcanology and Geothermal Research 51, 283-303.
Nicholls, I.A., 1971. Petrology of Santorini volcanic rocks. J Petrol. 12, 67–119.
Pe-Piper, G, & Piper, D.J.W, 2005. The South Aegean active volcanic arc: relationships between mag-
XLIII, No 5 – 2633
matism and tectonics. Developments in Volcanology 7, 113-133.
Pe-Piper, G, & Mourton, B. 2008. Magma evolution in the Pliocene–Pleistocene succession of Kos, South
Aegean arc, Greece. Lithos 106, p. 110-124
Pichler, H., & Kussmaul, S., 1972. The calc-alcaline volcanics rocks of the Santorini Group (Aegean Sea,
Greece), Neues Jahrbuch Mineralogie Abhandlungen, 116: 268-307N.
Pyle, D.M., Ivanovich, M., & Sparks, R.S.J., 1988. Magma–cumulate mixing identified by U–Th disequilibrium
dating. Nature 331, 157-159.
Seymour, K.St., Vlassopoulos, D., Pearse, T.H., & Rice, C.,1990. The record of magma chamber process
in plagioclase phenocryst at Thera volcano, Aegean volcanic arc, Greece. Contributions to Mineralogy
and Petrology. 104, 73-84.
Seymour, K.S., Vlassopoulos, D., 1992. Magma mixing at Nisyros volcano, as inferred from incompatible
trace-element systematics. Journal of Volcanology and Geothermal Research 50, 273–299.
Sparks, R.S.J., Sigurdsson, & H., Wilson, L., 1977. Magma mixing: a mechanism for triggering acid explosive
eruptions. Nature 267, 315–318.
Tsolis-Katagas, P., & Katagas, C., 1989. Zeolites in Pre-Caldera pyroclastic rocks of the Santorini Volcano,
Aegean Sea, Greece. Clays and Clay Minerals 37, 497-510.
Winchester, J. A., and Floyd, P. A., 1977. Geochemical discrimination of different magma series and their
differentiation products using immobile elements. Chemical Geology. 20, 325-343.
Zellmer, G.F., Sparks, R.S.J., Hawkesworth, C.J., & Wiedenbeck, M., 2003. Magma emplacement and remobilization
timescales beneath Montserrat: insights from Sr and Ba zonation in plagioclase phenocrysts.
Journal of Petrology 44, 1413–1431.
Most read articles by the same author(s)