Shrimp zircon geochronology constrains on Permian pyroclastic levels, Claromecó Basin, South West margin of Gondwana, Argentina

Pyroclastic levels are descripted in Sierras Australes outcrops and Claromeco Basin sub-surface records, interbedded with mudrocks and coal beds in the base of the Tunas Formation sequence that correspond to the Permian South West margin of Gondwana. The pyroclastic levels classify as fine tuff. SHR...

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Autores principales: Arzadún, G., Tomezzoli, R.N., Trindade, R., Gallo, L.C., Cesaretti, N.N., Calvagno, J.M.
Formato: JOUR
Materias:
age determination
coal seam
deformation
geochronology
glaciation
Gondwana
mudstone
Permian
pyroclastic deposit
SHRIMP dating
Argentina
Buenos Aires [Argentina]
Claromeco Basin
Sierras Australes
Decapoda (Crustacea)
Scombridae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08959811_v85_n_p191_Arzadun
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_08959811_v85_n_p191_Arzadun2023-10-03T15:43:35Z Shrimp zircon geochronology constrains on Permian pyroclastic levels, Claromecó Basin, South West margin of Gondwana, Argentina Arzadún, G. Tomezzoli, R.N. Trindade, R. Gallo, L.C. Cesaretti, N.N. Calvagno, J.M. age determination coal seam deformation geochronology glaciation Gondwana mudstone Permian pyroclastic deposit SHRIMP dating Argentina Buenos Aires [Argentina] Claromeco Basin Sierras Australes Decapoda (Crustacea) Scombridae Pyroclastic levels are descripted in Sierras Australes outcrops and Claromeco Basin sub-surface records, interbedded with mudrocks and coal beds in the base of the Tunas Formation sequence that correspond to the Permian South West margin of Gondwana. The pyroclastic levels classify as fine tuff. SHRIMP zircon ages obtained are 291.7 ± 2.9 Ma in the outcrop and 295.5 ± 8.0 Ma in the subsurface. These ages are consistent with other zircon SHRIMP ages of other outcrops tuff of the Tunas Formation, with Permian flora, and with tuff ages of correlated Gondwana areas, in the Paraná, Karoo and Paganzo basins. These data, in addition with other geological evidences, support a tectonically active and changing environment during the Permian of Gondwana. The ages allowed calculating a northward latitudinal speed of 2.7 cm/year for Gondwana during the Permian. This latitudinal movement is explained as the consequence of the final coupling of several continental microplates, gradually amalgamated from the southern margins of Gondwana and from the northern of Laurentia to configure the final Pangea during the Triassic. Since the main accretions in the southwestern margin of Gondwana could have started during the Devonian - Carboniferous, this Permian orogeny (San Rafael Orogenic Phase in Argentina) would be representing the post - collisional deformation, with a peak of compression in the Early Permian that was attenuating towards the foreland during the Late Permian - Early Triassic. With these results, it is also possible to constraint the age of the upper Paleozoic glaciation up to 295, previous to the deposition of the Tunas Formation in the Sauce Grande Formation. © 2018 Elsevier Ltd JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08959811_v85_n_p191_Arzadun
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic age determination
coal seam
deformation
geochronology
glaciation
Gondwana
mudstone
Permian
pyroclastic deposit
SHRIMP dating
Argentina
Buenos Aires [Argentina]
Claromeco Basin
Sierras Australes
Decapoda (Crustacea)
Scombridae
spellingShingle age determination
coal seam
deformation
geochronology
glaciation
Gondwana
mudstone
Permian
pyroclastic deposit
SHRIMP dating
Argentina
Buenos Aires [Argentina]
Claromeco Basin
Sierras Australes
Decapoda (Crustacea)
Scombridae
Arzadún, G.
Tomezzoli, R.N.
Trindade, R.
Gallo, L.C.
Cesaretti, N.N.
Calvagno, J.M.
Shrimp zircon geochronology constrains on Permian pyroclastic levels, Claromecó Basin, South West margin of Gondwana, Argentina
topic_facet age determination
coal seam
deformation
geochronology
glaciation
Gondwana
mudstone
Permian
pyroclastic deposit
SHRIMP dating
Argentina
Buenos Aires [Argentina]
Claromeco Basin
Sierras Australes
Decapoda (Crustacea)
Scombridae
description Pyroclastic levels are descripted in Sierras Australes outcrops and Claromeco Basin sub-surface records, interbedded with mudrocks and coal beds in the base of the Tunas Formation sequence that correspond to the Permian South West margin of Gondwana. The pyroclastic levels classify as fine tuff. SHRIMP zircon ages obtained are 291.7 ± 2.9 Ma in the outcrop and 295.5 ± 8.0 Ma in the subsurface. These ages are consistent with other zircon SHRIMP ages of other outcrops tuff of the Tunas Formation, with Permian flora, and with tuff ages of correlated Gondwana areas, in the Paraná, Karoo and Paganzo basins. These data, in addition with other geological evidences, support a tectonically active and changing environment during the Permian of Gondwana. The ages allowed calculating a northward latitudinal speed of 2.7 cm/year for Gondwana during the Permian. This latitudinal movement is explained as the consequence of the final coupling of several continental microplates, gradually amalgamated from the southern margins of Gondwana and from the northern of Laurentia to configure the final Pangea during the Triassic. Since the main accretions in the southwestern margin of Gondwana could have started during the Devonian - Carboniferous, this Permian orogeny (San Rafael Orogenic Phase in Argentina) would be representing the post - collisional deformation, with a peak of compression in the Early Permian that was attenuating towards the foreland during the Late Permian - Early Triassic. With these results, it is also possible to constraint the age of the upper Paleozoic glaciation up to 295, previous to the deposition of the Tunas Formation in the Sauce Grande Formation. © 2018 Elsevier Ltd
format JOUR
author Arzadún, G.
Tomezzoli, R.N.
Trindade, R.
Gallo, L.C.
Cesaretti, N.N.
Calvagno, J.M.
author_facet Arzadún, G.
Tomezzoli, R.N.
Trindade, R.
Gallo, L.C.
Cesaretti, N.N.
Calvagno, J.M.
author_sort Arzadún, G.
title Shrimp zircon geochronology constrains on Permian pyroclastic levels, Claromecó Basin, South West margin of Gondwana, Argentina
title_short Shrimp zircon geochronology constrains on Permian pyroclastic levels, Claromecó Basin, South West margin of Gondwana, Argentina
title_full Shrimp zircon geochronology constrains on Permian pyroclastic levels, Claromecó Basin, South West margin of Gondwana, Argentina
title_fullStr Shrimp zircon geochronology constrains on Permian pyroclastic levels, Claromecó Basin, South West margin of Gondwana, Argentina
title_full_unstemmed Shrimp zircon geochronology constrains on Permian pyroclastic levels, Claromecó Basin, South West margin of Gondwana, Argentina
title_sort shrimp zircon geochronology constrains on permian pyroclastic levels, claromecó basin, south west margin of gondwana, argentina
url http://hdl.handle.net/20.500.12110/paper_08959811_v85_n_p191_Arzadun
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AT tomezzolirn shrimpzircongeochronologyconstrainsonpermianpyroclasticlevelsclaromecobasinsouthwestmarginofgondwanaargentina
AT trindader shrimpzircongeochronologyconstrainsonpermianpyroclasticlevelsclaromecobasinsouthwestmarginofgondwanaargentina
AT gallolc shrimpzircongeochronologyconstrainsonpermianpyroclasticlevelsclaromecobasinsouthwestmarginofgondwanaargentina
AT cesarettinn shrimpzircongeochronologyconstrainsonpermianpyroclasticlevelsclaromecobasinsouthwestmarginofgondwanaargentina
AT calvagnojm shrimpzircongeochronologyconstrainsonpermianpyroclasticlevelsclaromecobasinsouthwestmarginofgondwanaargentina
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