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
 et al. 
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Abstract

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.

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Authors

  • Karen St. Seymour

  • Dimitrios Zouzias

  • Stylianos Tombros

  • Eftyhia Kolaiti

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