Characterisation and tracing of Permian magmatism in the south-western segment of the Gondwanan margin; U–Pb age, Lu–Hf and O isotopic compositions of detrital zircons from metasedimentary complexes of northern Antarctic Peninsula and western Patagonia

摘要: Abstract Metasedimentary rocks in the Antarctic Peninsula and south-western Patagonia record detrital zircon evidence for significant Permian magmatic events along Palaeo-Pacific margin of south West Gondwana. However, it is unclear where how this magmatism formed due to lack outcropping igneous sources at similar latitudes. Combined U–Pb, O, Lu–Hf isotope analyses grains Permo–Triassic metasedimentary indicate that resulted from interaction crust- mantle-derived an active continental margin. zircons Trinity Group range crustal signatures northern part (δ 18 O ~ 8‰, initial e Hf ~− 6) mantle-like values ~ 5‰, ~+ 3). Zircons domain have isotopic features those Patagonian Duque de York Complex. They also share a secondary Ordovician component ca. 470 Ma. The Middle Jurassic Cape Wallace Beds Low Island 250 Ma source, with stronger 7.5 10.8‰ − 3.2 − 14.2, respectively). In contrast, upper Miers Bluff Formation on Livingston Cretaceous sediments James Ross U–Pb ages, trends their counterparts, suggesting reworking after late Jurassic. Our results provide subduction-related arc, partly located extending Antarctica. southerly decrease δ coupled increasing fewer sedimentary components magma source consistent glaciated cold dry climate. These conditions are comparable Antarctica climate settings, close South Pole during Carboniferous Permian.