Manifestaciones de piritas framboidales en fumarolas de la Isla Decepción (Antártida): Implicancias genéticas

Pyrite framboids have beenrecognized in fumaroles on Deception Island, Antarctica. The sulphide was deposited around reworked pyroclastic tephra (lapilli).The formation process starts as a reaction between glass and hydrogen sulphide, giving rise to nucleation and growth of ironmonosulfide microcrystals. The microcrystals then convert to greigite, and form aggregates of uniformly sized microcrystals(development of framboids). Finally, greigite is replaced by pyrite. In this study pyrite was observed forming at 100ºC in less thanone hour.