U-Pb and Lu-Hf zircon geochronology of the Cañadón Asfalto Basin, Chubut, Argentina: Implications for the magmatic evolution in central Patagonia

The Cañadón Asfalto basin, central Chubut, Argentina, comprises a volcano-sedimentary sequence related to the opening of the Atlantic Ocean during Mesozoic times. The Lonco Trapial, Cañadón Asfalto and Cañadón Calcáreo formations are the main units related to the evolution of this basin. The Las Cha...

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Detalles Bibliográficos
Publicado: 2017
Materias:
Cañadón Asfalto basin
Central Chubut
Magmatic evolution
Middle Jurassic
U-Pb and Hf isotopes
Zircon geochronology
geochronology
hafnium
Jurassic
lutetium
magma chamber
uranium-lead dating
zircon
Argentina
Chubut
Patagonia
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v78_n_p190_Hauser
http://hdl.handle.net/20.500.12110/paper_08959811_v78_n_p190_Hauser
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_08959811_v78_n_p190_Hauser2023-06-08T15:49:00Z U-Pb and Lu-Hf zircon geochronology of the Cañadón Asfalto Basin, Chubut, Argentina: Implications for the magmatic evolution in central Patagonia Cañadón Asfalto basin Central Chubut Magmatic evolution Middle Jurassic U-Pb and Hf isotopes Zircon geochronology geochronology hafnium Jurassic lutetium magma chamber uranium-lead dating zircon Argentina Chubut Patagonia The Cañadón Asfalto basin, central Chubut, Argentina, comprises a volcano-sedimentary sequence related to the opening of the Atlantic Ocean during Mesozoic times. The Lonco Trapial, Cañadón Asfalto and Cañadón Calcáreo formations are the main units related to the evolution of this basin. The Las Chacritas and Puesto Almada members are distinguished in the Cañadón Asfalto Formation. LA-HR-ICP-MS U-Pb and Lu-Hf data on zircon were obtained on these units. The Lonco Trapial Formation gave a weighted average age of 172.3 ± 1.8 Ma. A pyroclastic level from the Las Chacritas Member gave a weighted average age of 168.2 ± 2.2 Ma. Two U-Pb concordant ages of 160.3 ± 1.7 Ma on a laminated tuffite and 158.3 ± 1.3 Ma on a pyroclastic level were obtained for the Puesto Almada Member. Two maximum depositional ages constrain the sedimentary provenance areas for the basin: 1) A sample from the Sierra de la Manea range, where a controversial unit related either to the Cañadón Asfalto or to the Cañadón Calcáreo formation occurs, gave an age of 176.6 ± 1.0 Ma. Two younger zircon crystals indicate that this unit may be related to the Cañadón Calcáreo Formation. 2) A sandstone with cross-stratification from the Puesto Almada Member gave a maximum depositional age of 173.6 ± 6.4 Ma. In terms of U-Pb and Lu-Hf isotopes, two magmatic events are identified in central Patagonia: the Mamil Choique magmatic event characterized by negative ε Hf values around −5.0 and representing recycling during Permian times of Mesoproterozoic crust (T DM of ∼1.5 Ga), and the Cañadón Asfalto magmatic event with negative (−8.2) to positive (+4) ε Hf values and Meso- to Neoproterozoic T DM between 1.5 and 0.8 Ga. The younger event is characterized by three main cycles: C1 related to the Lonco Trapial magmatism, C2 to the Las Chacritas volcanism, and C3 to the Puesto Almada volcanism. These cycles are related with Marifil, Chon Aike and El Quemado formations volcanics events of Patagonia and the Neuquén Basin during the Mesozoic. © 2017 Elsevier Ltd 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v78_n_p190_Hauser http://hdl.handle.net/20.500.12110/paper_08959811_v78_n_p190_Hauser
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cañadón Asfalto basin
Central Chubut
Magmatic evolution
Middle Jurassic
U-Pb and Hf isotopes
Zircon geochronology
geochronology
hafnium
Jurassic
lutetium
magma chamber
uranium-lead dating
zircon
Argentina
Chubut
Patagonia
spellingShingle Cañadón Asfalto basin
Central Chubut
Magmatic evolution
Middle Jurassic
U-Pb and Hf isotopes
Zircon geochronology
geochronology
hafnium
Jurassic
lutetium
magma chamber
uranium-lead dating
zircon
Argentina
Chubut
Patagonia
U-Pb and Lu-Hf zircon geochronology of the Cañadón Asfalto Basin, Chubut, Argentina: Implications for the magmatic evolution in central Patagonia
topic_facet Cañadón Asfalto basin
Central Chubut
Magmatic evolution
Middle Jurassic
U-Pb and Hf isotopes
Zircon geochronology
geochronology
hafnium
Jurassic
lutetium
magma chamber
uranium-lead dating
zircon
Argentina
Chubut
Patagonia
description The Cañadón Asfalto basin, central Chubut, Argentina, comprises a volcano-sedimentary sequence related to the opening of the Atlantic Ocean during Mesozoic times. The Lonco Trapial, Cañadón Asfalto and Cañadón Calcáreo formations are the main units related to the evolution of this basin. The Las Chacritas and Puesto Almada members are distinguished in the Cañadón Asfalto Formation. LA-HR-ICP-MS U-Pb and Lu-Hf data on zircon were obtained on these units. The Lonco Trapial Formation gave a weighted average age of 172.3 ± 1.8 Ma. A pyroclastic level from the Las Chacritas Member gave a weighted average age of 168.2 ± 2.2 Ma. Two U-Pb concordant ages of 160.3 ± 1.7 Ma on a laminated tuffite and 158.3 ± 1.3 Ma on a pyroclastic level were obtained for the Puesto Almada Member. Two maximum depositional ages constrain the sedimentary provenance areas for the basin: 1) A sample from the Sierra de la Manea range, where a controversial unit related either to the Cañadón Asfalto or to the Cañadón Calcáreo formation occurs, gave an age of 176.6 ± 1.0 Ma. Two younger zircon crystals indicate that this unit may be related to the Cañadón Calcáreo Formation. 2) A sandstone with cross-stratification from the Puesto Almada Member gave a maximum depositional age of 173.6 ± 6.4 Ma. In terms of U-Pb and Lu-Hf isotopes, two magmatic events are identified in central Patagonia: the Mamil Choique magmatic event characterized by negative ε Hf values around −5.0 and representing recycling during Permian times of Mesoproterozoic crust (T DM of ∼1.5 Ga), and the Cañadón Asfalto magmatic event with negative (−8.2) to positive (+4) ε Hf values and Meso- to Neoproterozoic T DM between 1.5 and 0.8 Ga. The younger event is characterized by three main cycles: C1 related to the Lonco Trapial magmatism, C2 to the Las Chacritas volcanism, and C3 to the Puesto Almada volcanism. These cycles are related with Marifil, Chon Aike and El Quemado formations volcanics events of Patagonia and the Neuquén Basin during the Mesozoic. © 2017 Elsevier Ltd
title U-Pb and Lu-Hf zircon geochronology of the Cañadón Asfalto Basin, Chubut, Argentina: Implications for the magmatic evolution in central Patagonia
title_short U-Pb and Lu-Hf zircon geochronology of the Cañadón Asfalto Basin, Chubut, Argentina: Implications for the magmatic evolution in central Patagonia
title_full U-Pb and Lu-Hf zircon geochronology of the Cañadón Asfalto Basin, Chubut, Argentina: Implications for the magmatic evolution in central Patagonia
title_fullStr U-Pb and Lu-Hf zircon geochronology of the Cañadón Asfalto Basin, Chubut, Argentina: Implications for the magmatic evolution in central Patagonia
title_full_unstemmed U-Pb and Lu-Hf zircon geochronology of the Cañadón Asfalto Basin, Chubut, Argentina: Implications for the magmatic evolution in central Patagonia
title_sort u-pb and lu-hf zircon geochronology of the cañadón asfalto basin, chubut, argentina: implications for the magmatic evolution in central patagonia
publishDate 2017
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v78_n_p190_Hauser
http://hdl.handle.net/20.500.12110/paper_08959811_v78_n_p190_Hauser
_version_ 1768542370145501184

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