Isotopic constraints on crustal architecture and Permo-Triassic tectonics in New Guinea: possible links with eastern Australia
New U-Pb zircon ages and Sr-Nd isotopic data for Triassic igneous and metomorphic rocks from northern New Guinea help constrain models of the evolution of Australia's northern and eastern margin. These data provide further evidence for an Early to Late Triassic volcanic arc in northern New Guin...
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Online Access: | http://hdl.handle.net/1885/87630 https://doi.org/10.1046/j.1400-0952.2003.01046.x |
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/87630 2024-01-14T10:01:01+01:00 Isotopic constraints on crustal architecture and Permo-Triassic tectonics in New Guinea: possible links with eastern Australia Crowhurst, R. Maas, Roland Hill, Kym Foster, David Fanning, Christopher http://hdl.handle.net/1885/87630 https://doi.org/10.1046/j.1400-0952.2003.01046.x unknown Blackwell Publishing Ltd 0812-0099 http://hdl.handle.net/1885/87630 doi:10.1046/j.1400-0952.2003.01046.x Australian Journal of Earth Sciences Keywords: crustal evolution geochronology isotopic composition Permian tectonics Triassic zircon Asia Eurasia Malay Archipelago New Guinea Southeast Asia Gondwana Neodymium isotopes New England Fold Belt Strontium isotopes Uranium-lead dating Journal article ftanucanberra https://doi.org/10.1046/j.1400-0952.2003.01046.x 2023-12-15T09:36:39Z New U-Pb zircon ages and Sr-Nd isotopic data for Triassic igneous and metomorphic rocks from northern New Guinea help constrain models of the evolution of Australia's northern and eastern margin. These data provide further evidence for an Early to Late Triassic volcanic arc in northern New Guinea, interpreted to have been part of a continuous magmatic belt along the Gondwana margin, through South America, Antarctica, New Zealand, the New England Fold Belt, New Guinea and into southeast Asia. The Early to Late Triassic volcanic arc in northern New Guinea intrudes high-grade metamorphic rocks probably resulting from Late Permian to Early Triassic (ca 260-240 Ma) orogenesis, as recorded in the New England Fold Belt. Late Triassic magmatism in New Guinea (ca 220 Ma) is related to coeval extension and riffing as a precursor to Jurassic breakup of the Gondwana margin. In general, mantle-like Sr-Nd isotopic compositions of mafic Palaeozoic to Tertiary granitoids appear to rule out the presence of a North Australian-type Proterozoic basement under the New Guinea Mobile Belt. Parts of northern New Guinea may have a continental or transitional basement whereas adjacent areas are underlain by oceanic crust. It is proposed that the post-breakup margin comprised promontories of extended Proterozoic-Palaeozoic continental crust separated by embayments of oceanic crust, analogous to Australia's North West Shelf. Inferred movement to the south of an accretionary prism through the Triassic is consistent with subduction to the south-southwest beneath northeast Australia generating arc-related magmatism in New Guinea and the New England Fold Belt. Article in Journal/Newspaper Antarc* Antarctica Antarctica New Zealand Australian National University: ANU Digital Collections New Zealand Australian Journal of Earth Sciences 51 1 107 124 |
institution |
Open Polar |
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Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
topic |
Keywords: crustal evolution geochronology isotopic composition Permian tectonics Triassic zircon Asia Eurasia Malay Archipelago New Guinea Southeast Asia Gondwana Neodymium isotopes New England Fold Belt Strontium isotopes Uranium-lead dating |
spellingShingle |
Keywords: crustal evolution geochronology isotopic composition Permian tectonics Triassic zircon Asia Eurasia Malay Archipelago New Guinea Southeast Asia Gondwana Neodymium isotopes New England Fold Belt Strontium isotopes Uranium-lead dating Crowhurst, R. Maas, Roland Hill, Kym Foster, David Fanning, Christopher Isotopic constraints on crustal architecture and Permo-Triassic tectonics in New Guinea: possible links with eastern Australia |
topic_facet |
Keywords: crustal evolution geochronology isotopic composition Permian tectonics Triassic zircon Asia Eurasia Malay Archipelago New Guinea Southeast Asia Gondwana Neodymium isotopes New England Fold Belt Strontium isotopes Uranium-lead dating |
description |
New U-Pb zircon ages and Sr-Nd isotopic data for Triassic igneous and metomorphic rocks from northern New Guinea help constrain models of the evolution of Australia's northern and eastern margin. These data provide further evidence for an Early to Late Triassic volcanic arc in northern New Guinea, interpreted to have been part of a continuous magmatic belt along the Gondwana margin, through South America, Antarctica, New Zealand, the New England Fold Belt, New Guinea and into southeast Asia. The Early to Late Triassic volcanic arc in northern New Guinea intrudes high-grade metamorphic rocks probably resulting from Late Permian to Early Triassic (ca 260-240 Ma) orogenesis, as recorded in the New England Fold Belt. Late Triassic magmatism in New Guinea (ca 220 Ma) is related to coeval extension and riffing as a precursor to Jurassic breakup of the Gondwana margin. In general, mantle-like Sr-Nd isotopic compositions of mafic Palaeozoic to Tertiary granitoids appear to rule out the presence of a North Australian-type Proterozoic basement under the New Guinea Mobile Belt. Parts of northern New Guinea may have a continental or transitional basement whereas adjacent areas are underlain by oceanic crust. It is proposed that the post-breakup margin comprised promontories of extended Proterozoic-Palaeozoic continental crust separated by embayments of oceanic crust, analogous to Australia's North West Shelf. Inferred movement to the south of an accretionary prism through the Triassic is consistent with subduction to the south-southwest beneath northeast Australia generating arc-related magmatism in New Guinea and the New England Fold Belt. |
format |
Article in Journal/Newspaper |
author |
Crowhurst, R. Maas, Roland Hill, Kym Foster, David Fanning, Christopher |
author_facet |
Crowhurst, R. Maas, Roland Hill, Kym Foster, David Fanning, Christopher |
author_sort |
Crowhurst, R. |
title |
Isotopic constraints on crustal architecture and Permo-Triassic tectonics in New Guinea: possible links with eastern Australia |
title_short |
Isotopic constraints on crustal architecture and Permo-Triassic tectonics in New Guinea: possible links with eastern Australia |
title_full |
Isotopic constraints on crustal architecture and Permo-Triassic tectonics in New Guinea: possible links with eastern Australia |
title_fullStr |
Isotopic constraints on crustal architecture and Permo-Triassic tectonics in New Guinea: possible links with eastern Australia |
title_full_unstemmed |
Isotopic constraints on crustal architecture and Permo-Triassic tectonics in New Guinea: possible links with eastern Australia |
title_sort |
isotopic constraints on crustal architecture and permo-triassic tectonics in new guinea: possible links with eastern australia |
publisher |
Blackwell Publishing Ltd |
url |
http://hdl.handle.net/1885/87630 https://doi.org/10.1046/j.1400-0952.2003.01046.x |
geographic |
New Zealand |
geographic_facet |
New Zealand |
genre |
Antarc* Antarctica Antarctica New Zealand |
genre_facet |
Antarc* Antarctica Antarctica New Zealand |
op_source |
Australian Journal of Earth Sciences |
op_relation |
0812-0099 http://hdl.handle.net/1885/87630 doi:10.1046/j.1400-0952.2003.01046.x |
op_doi |
https://doi.org/10.1046/j.1400-0952.2003.01046.x |
container_title |
Australian Journal of Earth Sciences |
container_volume |
51 |
container_issue |
1 |
container_start_page |
107 |
op_container_end_page |
124 |
_version_ |
1788066867501334528 |