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
Metasedimentary rocks in the Antarctic Peninsula and south-western Patagonia record detrital zircon evidence for significant Permian magmatic events along the Palaeo-Pacific margin of south West Gondwana. However, it is unclear where and how this magmatism formed due to the lack of outcropping Permi...
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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/103261 2023-05-15T13:57:31+02:00 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 Castillo Gonzalez, Paula Fanning, Christopher Herve, Francisco Lacassie, Juan Pablo 2016-06-14T23:20:13Z http://hdl.handle.net/1885/103261 unknown Elsevier 1342-937X http://hdl.handle.net/1885/103261 Gondwana Research Journal article 2016 ftanucanberra 2016-06-20T22:19:55Z Metasedimentary rocks in the Antarctic Peninsula and south-western Patagonia record detrital zircon evidence for significant Permian magmatic events along the Palaeo-Pacific margin of south West Gondwana. However, it is unclear where and how this magmatism formed due to the lack of outcropping Permian igneous sources at similar latitudes. Combined U-Pb, O, and Lu-Hf isotope analyses of detrital zircon grains in Permo-Triassic metasedimentary rocks indicate that the Permian magmatism resulted from the interaction of crust- and mantle-derived sources in an active continental margin. Permian detrital zircons from the Trinity Peninsula Group in the Antarctic Peninsula range from crustal signatures in the northern part (δ18O of ~8‰, initial ε Hf of ~-6) to mantle-like values in the south (δ18O of ~5‰, initial ε Hf of ~+3). Zircons from the northern domain have isotopic features similar to those from the Patagonian Duque de York Complex. They also share a secondary Ordovician component of ca. 470Ma. The Middle Jurassic Cape Wallace Beds in Low Island record a ca. 250Ma igneous source, with stronger crustal signatures (δ18O and initial ε Hf values of 7.5 to 10.8‰ and -3.2 to -14.2, respectively). In contrast, zircons from the upper Jurassic Miers Bluff Formation on Livingston Island and Cretaceous sediments on James Ross Island have similar Permian U-Pb ages, O and Hf trends to their Trinity Peninsula Group counterparts, suggesting reworking after the late Jurassic. Our results provide evidence for a Permian subduction-related magmatic arc, partly located in Patagonia and extending to West Antarctica. The southerly decrease in δ18O coupled with increasing initial ε Hf indicate fewer sedimentary components in the magma source and is consistent with a glaciated cold and dry climate. These conditions are comparable with West Antarctica climate settings, located close to the South Pole during the Carboniferous and Permian. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica James Ross Island Livingston Island Low Island Ross Island South pole South pole West Antarctica Australian National University: ANU Digital Collections Antarctic The Antarctic Antarctic Peninsula Patagonia West Antarctica Ross Island Pacific South Pole Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) Miers ENVELOPE(163.850,163.850,-78.100,-78.100) Trinity Peninsula ENVELOPE(-58.000,-58.000,-63.500,-63.500) Miers Bluff ENVELOPE(-60.438,-60.438,-62.720,-62.720) Cape Wallace ENVELOPE(-62.250,-62.250,-63.217,-63.217) |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
description |
Metasedimentary rocks in the Antarctic Peninsula and south-western Patagonia record detrital zircon evidence for significant Permian magmatic events along the Palaeo-Pacific margin of south West Gondwana. However, it is unclear where and how this magmatism formed due to the lack of outcropping Permian igneous sources at similar latitudes. Combined U-Pb, O, and Lu-Hf isotope analyses of detrital zircon grains in Permo-Triassic metasedimentary rocks indicate that the Permian magmatism resulted from the interaction of crust- and mantle-derived sources in an active continental margin. Permian detrital zircons from the Trinity Peninsula Group in the Antarctic Peninsula range from crustal signatures in the northern part (δ18O of ~8‰, initial ε Hf of ~-6) to mantle-like values in the south (δ18O of ~5‰, initial ε Hf of ~+3). Zircons from the northern domain have isotopic features similar to those from the Patagonian Duque de York Complex. They also share a secondary Ordovician component of ca. 470Ma. The Middle Jurassic Cape Wallace Beds in Low Island record a ca. 250Ma igneous source, with stronger crustal signatures (δ18O and initial ε Hf values of 7.5 to 10.8‰ and -3.2 to -14.2, respectively). In contrast, zircons from the upper Jurassic Miers Bluff Formation on Livingston Island and Cretaceous sediments on James Ross Island have similar Permian U-Pb ages, O and Hf trends to their Trinity Peninsula Group counterparts, suggesting reworking after the late Jurassic. Our results provide evidence for a Permian subduction-related magmatic arc, partly located in Patagonia and extending to West Antarctica. The southerly decrease in δ18O coupled with increasing initial ε Hf indicate fewer sedimentary components in the magma source and is consistent with a glaciated cold and dry climate. These conditions are comparable with West Antarctica climate settings, located close to the South Pole during the Carboniferous and Permian. |
format |
Article in Journal/Newspaper |
author |
Castillo Gonzalez, Paula Fanning, Christopher Herve, Francisco Lacassie, Juan Pablo |
spellingShingle |
Castillo Gonzalez, Paula Fanning, Christopher Herve, Francisco Lacassie, Juan Pablo 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 |
author_facet |
Castillo Gonzalez, Paula Fanning, Christopher Herve, Francisco Lacassie, Juan Pablo |
author_sort |
Castillo Gonzalez, Paula |
title |
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 |
title_short |
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 |
title_full |
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 |
title_fullStr |
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 |
title_full_unstemmed |
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 |
title_sort |
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 |
publisher |
Elsevier |
publishDate |
2016 |
url |
http://hdl.handle.net/1885/103261 |
long_lat |
ENVELOPE(-60.500,-60.500,-62.600,-62.600) ENVELOPE(163.850,163.850,-78.100,-78.100) ENVELOPE(-58.000,-58.000,-63.500,-63.500) ENVELOPE(-60.438,-60.438,-62.720,-62.720) ENVELOPE(-62.250,-62.250,-63.217,-63.217) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Patagonia West Antarctica Ross Island Pacific South Pole Livingston Island Miers Trinity Peninsula Miers Bluff Cape Wallace |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Patagonia West Antarctica Ross Island Pacific South Pole Livingston Island Miers Trinity Peninsula Miers Bluff Cape Wallace |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica James Ross Island Livingston Island Low Island Ross Island South pole South pole West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica James Ross Island Livingston Island Low Island Ross Island South pole South pole West Antarctica |
op_source |
Gondwana Research |
op_relation |
1342-937X http://hdl.handle.net/1885/103261 |
_version_ |
1766265199388524544 |