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1 Bulletin of the Polish Academy of Sciences. Earth Sciences

1 1999

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Sulphide and oxide ore mineralization at Reptile Ridge, Adelaide Island, West Antarctica

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Birkenmajer K. , Doktor M. , Piestrzyński A.

tom Vol. 47, nr 2-3

135-153

Metalliferous sulphide and oxide mineralization was studied at Reptile Ridge, Adelaide Island, West Antarctica. It occurs in metavolcanics and metaquanzites of the Antarctic Peninsula Volcanic Group (APVG: Upper Jurassic - Lower Cretaceous) and, to a lesser degree, in adamellite-granodiorite pluton of the Andean Intnisive Suite (AIS: probably Cretaceous). The mineralization zone had developed along a NNE-SSW-striking fault which displaces the volcanics (APVG) and the pluton (AIS). Among sulphides, pyrite, pyrrhotite, sphene and chalcopyrite are the most common. The oxides are represented mainly by magnetite, haematite, haemoilmenite and rutile. Two phases of pneumatolytic-hydrothermal mineralization were recognized in the metaquartzites (APVG): (1) the first phase produced Fe-Ti mineral association in form of veins and fills of intergranular spaces; (2) the second phase produced Fe-Cu sulphide mineralization mainly as fills of intergranular spaces.