Abstract

Several sulfide-sulfate ore accumulations which show typical features of Kuroko-type deposits occur within Pleistocene pyroclastics on the Greek islands of Milos, Kimolos, Poliegos, and Antimilos, which belong to the currently active Aegean island arc. A large number of ore and country rock samples were analyzed to obtain their sulfur isotope ratios and geochemical compositions including trace elements and REE distribution. Based on this data, a metallogenic model of continuous interaction between andesitic tuffs and circulating seawater is proposed. Ore formation took place by oxidation and disproportionation at temperatures between 220° and 260°. The sulfide-sulfur is interpreted to be derived from seawater sulfate, whereas the heavy metals originate exclusively from the Plio-Pleistocene volcanics. It is concluded that these sulfide-sulfate deposits are the youngest Kuroko-type mineralization so far described, being even younger than the Miocene Japanese deposits.

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