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7466763 
Journal Article 
Geochemistry of the Serifos pluton (Cycladic islands) and associated iron oxide and sulfide ores: Skarn or metamorphosed exhalite deposits? 
St Seymour, K; Zouzias, D; Tombros, S; Kolaiti, E 
2009 
1 
Neues Jahrbuch fuer Mineralogie. Abhandlungen
ISSN: 0077-7757 
E SCHWEIZERBARTSCHE VERLAGSBUCHHANDLUNG 
STUTTGART 
186 
3 
249-270 
English 
WOS:000272214100002 
In Serifos island a mid-Miocene pluton was emplaced syntectonically at ca. 11 Ma in a northeasterly trending fault zone within schist and marble of the Cycladic Blueschist Unit. The central mass of the pluton consists mainly of hornblende-biotite granodiorite and less tonalite, its border facies is granodiorite to granite. Associated dykes are mainly granodioritic. Amphibole geothermobarometry indicates pluton emplacement at initial maximum P approximate to 3.1 +/- 0.6 kbar and T between 748 degrees to 718 degrees C under hypersolvus conditions. Magnetite-hematite ores, which have been mined since antiquity, occur in the proximity of the Serifos pluton. Most of iron oxide ores are located in marble within the contact metamorphic aureole and have been considered as skarn deposits. However, a few iron oxide and base metal sulfide deposits occur outside the contact aureole. The trace element (V, Ti, Ni) characteristics of the iron ores suggest a sedimentary provenance. The sulfide ores are folded and because the geochemistry of some of the schists of the encasing Blueschist Unit shows them to be of possible metavolcanic origin, on alternative exhalite genesis is suggested for these Serifos ores. 
Magnetite-hematite ores; sulfide ore; volcano-sedimentary protoliths; granodiorite