Abstract
Trace element systematics throughout the cal-calkaline high alumina basalt — basaltic andesite — andesite — dacite — rhyodacite lavas and dyke rocks of the Main Volcanic Series of Santorini volcano, Greece are consistent with the crystal fractionation of observed phenocryst phases from a parental basaltic magma as the dominant mechanism involved in generating the range of magmatic compositions. Marked inflection points in several variation trends correspond to changes in phenocryst mineralogy and divide the Main Series into two distinct crystallisation intervals — an early basalt to andesite stage characterised by calcic plagioclase+augite+olivine separation and a later andesite to rhyodacite stage generated by plagioclase augite+hypersthene+magnetite+apatite crystallisation. Percent solidification values derived from ratios of highly incompatible trace elements agree with previous values derived from major element data using addition-subtraction diagrams and indicate that basaltic andesites represent 47–69%; andesites 70–76%; dacites ca. 80% and rhyodacite ca. 84% crystallisation of the initial basalt magma. Least squares major element mixing calculations also confirm that crystal fractionation of the least fractionated basalts could generate derivative Main Series lavas, though the details of the least squares solutions differ significantly from those derived from highly incompatible element and addition-subtraction techniques. Main Series basalts may result from partial melting of the mantle asthenosphere wedge followed by limited olivine+pyroxene+Cr-spinel crystallisation on ascent through the sub-Aegean mantle and may fractionate to more evolved compositions at pressures close to the base of the Aegean crust. Residual andesitic to rhyodacite magmas may stagnate within the upper regions of the sialic Aegean crust and form relatively high level magma chambers beneath the southern volcanic centres of Santorini. The eruption of large volumes of basic lavas and silicic pyroclastics from Santorini may have a volcanological rather than petrological explanation.
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Allègre CJ, Treuil M, Minster JF, Minster B, Albarade F (1977) Systematic use of trace elements in igneous process, Part I. Fractional crystallisation processes in volcanic suites. Contrib Mineral Petrol 60:57–75
Arth JG (1981) Rare earth element geochemistry of the island arc volcanic rocks of Rabaul and Talasea, New Britain. Geol Soc Am Bull 92:858–863
Banks R (1979) The use of linear programming in the analysis of petrological mixing problems. Contrib Mineral Petrol 70:237–244
Comninakis PE, Papazachos BC (1980) Space and time distribution of the intermediate focal depth earthquakes in the Hellenic Arc. Tectonophys 70:T35-T47
Drake MJ, Weill DF (1975) Partition of Sr, Ba, Ca, Y, Eu2+, Eu3+ and other REE between plagioclase feldspar and magmatic liquid: an experimental study. Geochim Cosmochim Acta 39:689–712
Durr St, Altherr R, Keller J, Okrusch M, Seidel E (1978) The Median Aegean Crystalline Belt: Stratigraphy, structure, metamorphism, magmatism. In: Alps, Apennines, Hellenides (Closs H, Roeder D, Schmidt K eds), pp 455–477. Stuttgart: Schweizerbart
Eggler DH, Osborn EF (1982) Experimental studies of the system MgO-FeO-Fe2O3-NaAlSi3O8-CaAl2Si2O8-SiO2- a model for sub-alkaline magmas. Am J Sci 282:1012–1041
Evensen NM, Hamilton PJ, O'Nions RK (1978) Rare earth abundances in chondritic meteorites. Geochim Cosmochim Acta 42:1199–1212
Fytikas M, Guiliani O, Innocenti F, Marinelli G, Mazzuoli R (1976) Geochronological data on recent magmatism of Aegean Sea. Tectonophys 31:T29-T34
Gill JB (1978) Role of trace element partition coefficients in models of andesite genesis. Geochim Cosmochim Acta 42:709–724
Gill JB (1981) Orogenic andesites and plate tectonics. (Mineral and Rocks Vol 16), pp 390. Berlin-Heidelberg, Springer Verlag
Green TH, Watson EB (1982) Crystallization of apatite in natural magmas under high pressure, hydrous conditions, with particular reference to ‘orogenic’ rock series. Contrib Mineral Petrol 79:96–105
Hammer CU, Clausen HB, Dansgaard W (1980) Greenland ice sheet evidence of post-glacial volcanism and its climatic impact. Nature 288:230–235
Heming RF (1974) Geology and petrology of Rabaul caldera, Papua New Guinea. Geol Soc Am Bull 85:1253–1264
Hoefs J (1978) Oxygen isotope composition of volcanic rocks from Santorini and Christiani. In: Thera and the Aegean World. Vol I (Doumas C ed), pp 163–170. Athens: Tsiveriotis
Innocenti F, Manetti P, Peccerillo A, Poli G (1981) South Aegean volcanic arc: geochemical variations and geotectonic implications. Bull Volcanol 44:377–391
Irvine TN, Baragar WR (1971) A guide to the chemical classification of the common igneous rocks. Can J Earth Sci 8:523–548
Irving AJ (1978) A review of experimental studies of crystal/liquid trace element partitioning. Geochim Cosmochim Acta 42:743–770
Keller J (1982) Mediterranean island arcs. In: Andesites (Thorpe RS ed), pp 307–325. Chichester: Wiley
Luhr JF, Carmichael ISE (1980) The Colima volcanic complex, Mexico. Contrib Mineral Petrol 71:343–372
McKenzie D (1978) Active tectonics of the Alpine — Himalayan belt: the Aegean Sea and surrounding regions (tectonics of the Aegean region). Geophys JR Astr Soc 55:217–254
Miyashiro A (1974) Volcanic rock series in island arcs and active continental margins. Am J Sci 274:321–355
Nicholls IA (1968) Petrology and geochemistry of Santorini lavas. Unpubl PhD thesis, Univ of Cambridge, pp 275
Nicholls IA (1971) Petrology of Santorini volcano, Cyclades, Greece. J Petrol 12:67–119
Nicholls IA (1978) Primary basaltic magmas for the pre-caldera volcanic rocks of Santorini. In: Thera and the Aegean World. Vol I. (Doumas C ed), pp 109–120. Athens: Tsiveriotis
Nicholls IA, Harris KL (1980) Experimental rare earth element partition coefficients for garnet, clinopyroxene and amphibole co-existing with andesitic and basaltic liquids. Geochim Cosmochim Acta 44:287–308
O'Hara MJ, Mathews RE (1981) Geochemical evolution in an advancing, periodically replenished, periodically tapped, continuously fractionated magma chamber. J Geol Lond 138:237–277
Osborn EF (1976) Origin of calc-alkali magma series of Santorini volcano type in the light of recent experimental phase equilibria studies. In: Proc Int Cong Therm Waters, Geotherm Energy, Volcanism Med Area, Vol 3, pp 154–167, Athens
Osborn EF (1979) The reaction principle. In: The evolution of the igneous rocks — fiftieth anniversary perspectives (Yoder HS Jnr ed), pp 133–170, Princeton: Univ Press
Osborn EF (1983 in press) On the significance of the spinel phase in subalkaline volcanic magmas. Mem Geol Soc China 5 (Taipei)
Osborn EF, Boctor NZ (1981) Some additional observations on magnetite in calc-alkaline volcanic rocks. Carnegie Inst Wash Yearb 80:324–327
Osborn EF, Rawson SA (1980) Experimental studies of magnetite in calc-alkaline rocks. Carnegie Inst Wash Yearb 79:281–285
Papazachos BC, Comninakis PE (1978) Geotectonic significance of the deep seismic zones in the Aegean area. In: Thera and the Aegean World. Vol I. (Doumas C ed), pp 121–129. Athens: Tsiveriotis
Pe GG, Gledhill A (1975) Strontium isotope ratios in volcanic rocks from the southeastern part of the Hellenic Arc. Lithos 8:209–214
Peacock MA (1931) Classification of igneous rock series. J Geol 39:54–67
Pearce JA, Norry MJ (1979) Petrogenetic implications of Ti, Zr, Y and Nb variations in volcanic rocks. Contrib Mineral Petrol 69:33–47
Pichler H, Friedrich WL (1980) Mechanism of the Minoan eruption of Santorini. In: Thera and the Aegean World. Vol 2 (Doumas C ed), pp 15–30
Pichler H, Kussmaul S (1972) The calc-alkaline volcanic rocks of the Santorini group (Aegean Sea, Greece). N Jb Mineral Abh 116:268–307
Pichler H, Kussmaul S (1980) Comments on the geological map of the Santorini Islands. In: Thera and the Aegean World. Vol 2. (Doumas C ed), pp 413–427. Athens: Tsiveriotis
Puchelt H (1978a) Geochemical implications for the Santorini Island group (Aegean Sea, Greece). In: Alps, Apennines, Hellenides (Closs H, Roeder D, Schmidt K eds), pp 489–493, Stuttgart, Schweizerbart
Puchelt H (1978b) Evolution of the volcanic rocks of Santorini. In: Thera and the Aegean world. Vol 1 (Doumas C ed), pp 131–146. Athens, Tsiveriotis
Puchelt H, Hoefs J (1971) Preliminary geochemical and strontium isotope investigations on Santorini rocks. In: Ist International Scientific Congress on the volcano of Thera. pp 318–327. Athens
Saunders AD, Tarney J, Weaver SD (1980) Transverse geochemical variation across the Antarctic peninsula: implications for the genesis of calc-alkaline magmas. Earth Planet Sci Lett 46:344–360
Sharp ADL, Davis PM, Gray F (1980) A low velocity zone beneath Mount Etna and magma storage. Nature 287:587–591
Sparks RSJ, Huang TC (1980) The volcanological significance of deep-sea ash layers associated with ignimbrites. Geol Mag 117:425–436
Sparks RSJ, Sigurdsson H, Wilson L (1977) Magma mixing: a mechanism for triggering acid explosive eruptions. Nature 267:315–318
Sweatman TR, Long JVP (1969) Quantitative electron probe microanalysis of rock forming minerals. J Petrol 10:332–379
Thompson RN, Dickin AP, Gibson IL, Morrison MA (1982) Elemental fingerprints of isotopic contamination of Hebridean Palaeocene mantle-derived magmas by archean sial. Contrib Mineral Petrol 79:159–168
Thorpe RS (1982) Andesites. (Orogenic andesites and related rocks). 724 pp, Chichester, Wiley
Treuil M, Varet J (1973) Criteres volcanologiques, petrologiques et géochimiques de la genese et de la differenciation des magmas basaltiques: exemple de l'Afar. Bull Soc Geol France, 7eme Serie, 15:401–644
Villemant B, Jaffrezic H, Joron J-L, Treuil M (1981) Distribution coefficients of major and trace elements; fractional crystallization in the alkali basalt series of Chaîne des Puys (Massif Central, France). Geochim Cosmochim Acta 45:1997–2016
Whitley JE, Moyes AB, Bowden P (1979) Determination of rare earth elements in geological samples by neutron activation analyses. J Radioanal Chem 48:147–158
Wright TL, Doherty PC (1970) A linear programming and least squares computer method for solving petrological mixing problems. Geol Soc Am Bull 81:1995–2008
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Department of Earth Sciences Contribution No. 395
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Mann, A.C. Trace element geochemistry of high alumina basalt - Andesite - Dacite - Rhyodacite lavas of the Main Volcanic Series of Santorini Volcano, Greece. Contr. Mineral. and Petrol. 84, 43–57 (1983). https://doi.org/10.1007/BF01132329
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DOI: https://doi.org/10.1007/BF01132329