The Gondwana connections of northern Patagonia
A multidisciplinary study (U-Pb sensitive high-resolution ion microprobe geochronology, Hf and O isotopes in zircon, Sr and Nd isotopes in whole-rocks, as well as major and trace element geochemistry) has been carried out on granitoid samples from the area west of Valcheta, North Patagonian Massif,...
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todo:paper_00167649_v171_n3_p313_Pankhurst2023-10-03T14:14:47Z The Gondwana connections of northern Patagonia Pankhurst, R.J. Rapela, C.W. López de Luchi, M.G. Rapalini, A.E. Fanning, C.M. Galindo, C. Geochronology Granite Isotopes Lead Neodymium Silicate minerals Uranium Hf and O isotopes Major and trace elements Northern patagonia Orogenic belts Sensitive high-resolution ion microprobe Sierras pampeanas Sr and Nd isotopes Structural information Strontium fold belt geochronology Gondwana granitoid granodiorite hafnium ion microprobe neodymium isotope oxygen isotope petrology strontium isotope trace element uranium-lead dating zircon Antarctica Argentina Buenos Aires [Argentina] Patagonia Sierra de la Ventana Sierras Pampeanas Transantarctic Mountains A multidisciplinary study (U-Pb sensitive high-resolution ion microprobe geochronology, Hf and O isotopes in zircon, Sr and Nd isotopes in whole-rocks, as well as major and trace element geochemistry) has been carried out on granitoid samples from the area west of Valcheta, North Patagonian Massif, Argentina. These confirm the Cambrian age of the Tardugno Granodiorite (528 ± 4 Ma) and the Late Permian age of granites in the central part of the Yaminué complex (250 Ma). Together with petrological and structural information for the area, we consider a previously suggested idea that the Cambrian and Ordovician granites of northeastern Patagonia represent continuation of the Pampean and Famatinian orogenic belts of the Sierras Pampeanas, respectively. Our interpretation does not support the hypothesis that Patagonia was accreted in Late Palaeozoic times as a far-travelled terrane, originating in the Central Transantarctic Mountains, and the arguments for and against this idea are reviewed. A parautochthonous origin is preferred with no major ocean closure between the North Patagonian Massif and the Sierra de la Ventana fold belt. © 2014 The Geological Society of London. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00167649_v171_n3_p313_Pankhurst |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Geochronology Granite Isotopes Lead Neodymium Silicate minerals Uranium Hf and O isotopes Major and trace elements Northern patagonia Orogenic belts Sensitive high-resolution ion microprobe Sierras pampeanas Sr and Nd isotopes Structural information Strontium fold belt geochronology Gondwana granitoid granodiorite hafnium ion microprobe neodymium isotope oxygen isotope petrology strontium isotope trace element uranium-lead dating zircon Antarctica Argentina Buenos Aires [Argentina] Patagonia Sierra de la Ventana Sierras Pampeanas Transantarctic Mountains |
| spellingShingle |
Geochronology Granite Isotopes Lead Neodymium Silicate minerals Uranium Hf and O isotopes Major and trace elements Northern patagonia Orogenic belts Sensitive high-resolution ion microprobe Sierras pampeanas Sr and Nd isotopes Structural information Strontium fold belt geochronology Gondwana granitoid granodiorite hafnium ion microprobe neodymium isotope oxygen isotope petrology strontium isotope trace element uranium-lead dating zircon Antarctica Argentina Buenos Aires [Argentina] Patagonia Sierra de la Ventana Sierras Pampeanas Transantarctic Mountains Pankhurst, R.J. Rapela, C.W. López de Luchi, M.G. Rapalini, A.E. Fanning, C.M. Galindo, C. The Gondwana connections of northern Patagonia |
| topic_facet |
Geochronology Granite Isotopes Lead Neodymium Silicate minerals Uranium Hf and O isotopes Major and trace elements Northern patagonia Orogenic belts Sensitive high-resolution ion microprobe Sierras pampeanas Sr and Nd isotopes Structural information Strontium fold belt geochronology Gondwana granitoid granodiorite hafnium ion microprobe neodymium isotope oxygen isotope petrology strontium isotope trace element uranium-lead dating zircon Antarctica Argentina Buenos Aires [Argentina] Patagonia Sierra de la Ventana Sierras Pampeanas Transantarctic Mountains |
| description |
A multidisciplinary study (U-Pb sensitive high-resolution ion microprobe geochronology, Hf and O isotopes in zircon, Sr and Nd isotopes in whole-rocks, as well as major and trace element geochemistry) has been carried out on granitoid samples from the area west of Valcheta, North Patagonian Massif, Argentina. These confirm the Cambrian age of the Tardugno Granodiorite (528 ± 4 Ma) and the Late Permian age of granites in the central part of the Yaminué complex (250 Ma). Together with petrological and structural information for the area, we consider a previously suggested idea that the Cambrian and Ordovician granites of northeastern Patagonia represent continuation of the Pampean and Famatinian orogenic belts of the Sierras Pampeanas, respectively. Our interpretation does not support the hypothesis that Patagonia was accreted in Late Palaeozoic times as a far-travelled terrane, originating in the Central Transantarctic Mountains, and the arguments for and against this idea are reviewed. A parautochthonous origin is preferred with no major ocean closure between the North Patagonian Massif and the Sierra de la Ventana fold belt. © 2014 The Geological Society of London. |
| format |
JOUR |
| author |
Pankhurst, R.J. Rapela, C.W. López de Luchi, M.G. Rapalini, A.E. Fanning, C.M. Galindo, C. |
| author_facet |
Pankhurst, R.J. Rapela, C.W. López de Luchi, M.G. Rapalini, A.E. Fanning, C.M. Galindo, C. |
| author_sort |
Pankhurst, R.J. |
| title |
The Gondwana connections of northern Patagonia |
| title_short |
The Gondwana connections of northern Patagonia |
| title_full |
The Gondwana connections of northern Patagonia |
| title_fullStr |
The Gondwana connections of northern Patagonia |
| title_full_unstemmed |
The Gondwana connections of northern Patagonia |
| title_sort |
gondwana connections of northern patagonia |
| url |
http://hdl.handle.net/20.500.12110/paper_00167649_v171_n3_p313_Pankhurst |
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