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Geology of Gerlache Strait, west Antarctica. II. Wiencke Island to Brabant Island

Birkenmajer K.

Bulletin of the Polish Academy of Sciences. Earth Sciences

1998

Vol. 46, nr 3-4

167-190

Four major fault-boundedc tectonic blocks are recognized in the Gerlache Strait area, West Antarctica: (A) the Danco Coast Block; (B) the Brabant Island Block; (C) the Neumayer Channel Block; and (D) the Anvers-Melchior Islands Block. The blocks differ from each other in the succession and age of rocks: (A) metasediments of the Trinity Penisula Group (TPZG:? Upper Permian-Triassic). Uncorfarmably covered by a thich basaltic-andesitic effusive complex (Antarctid Penisula Volamic Group, APVG: Lower Cretaceous), intruded by granitic trough gabbroic plutons (Andean Intrusive Suite, AIS-I: Berriasian-Cenomanian) and by hypabyssal dykes and sillsof several generations (AIS-2: ?Upper Creataceous and /or Tertiary);(B) basaltic-andesitic effusive complex (APVG: ?Lower Cretaceous), intruded by a granodiorite aill (AIS-1) and by hypabyssal dykes of several generations (AIS-2), unconformably covered by /Late Tertiary volcanics; (C) Early Tertiary granite-granodiorite pluton, intruded by hypabyssal dykes of several generations, eroded and weathered, covered by strainform ? Late Tertiary volcanics; (D) effusive complex (?APVG), followed by granitoid and hybrid intrusions apparently representing there successive phases, of Late Paleocene, Eocene/Oligocene boundary, and Early Miocenes ages, intruded by several systems of hypabyssal dykes.