The age and tectonic setting of the Puncoviscana Formation in northwestern Argentina: An accretionary complex related to Early Cambrian closure of the Puncoviscana Ocean and accretion of the Arequipa-Antofalla block

TIMS and SHRIMP U-Pb zircon geochronology of selected parts of the Puncoviscana Formation suggest its deposition took place mainly during the Early Cambrian, coeval with 540-535. Ma calc-alkaline Pampean arc volcanism mainly preserved as tuff beds in the oldest identified parts of this unit. Syn- to...

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Autores principales: Escayola, M.P., van Staal, C.R., Davis, W.J.
Formato: JOUR
Materias:
Arequipa Antofalla
Puncoviscana Ocean
Tilcarian-Pampean orogeny
accretionary prism
Cambrian
deposition
Ediacaran
foreland basin
geochronology
Gondwana
Laurentia
lead isotope
low grade metamorphism
pluton
tectonic setting
unconformity
Argentina
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08959811_v32_n4_p438_Escayola
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_08959811_v32_n4_p438_Escayola2023-10-03T15:43:00Z The age and tectonic setting of the Puncoviscana Formation in northwestern Argentina: An accretionary complex related to Early Cambrian closure of the Puncoviscana Ocean and accretion of the Arequipa-Antofalla block Escayola, M.P. van Staal, C.R. Davis, W.J. Arequipa Antofalla Puncoviscana Ocean Tilcarian-Pampean orogeny accretionary prism Cambrian deposition Ediacaran foreland basin geochronology Gondwana Laurentia lead isotope low grade metamorphism pluton tectonic setting unconformity Argentina TIMS and SHRIMP U-Pb zircon geochronology of selected parts of the Puncoviscana Formation suggest its deposition took place mainly during the Early Cambrian, coeval with 540-535. Ma calc-alkaline Pampean arc volcanism mainly preserved as tuff beds in the oldest identified parts of this unit. Syn- to post-tectonic plutons constrains the Tilcarian-Pampean orogeny to have occurred between ca. 530. Ma and deposition of the unconformably overlying Middle-Upper Cambrian Meson Group. Deposition of the Puncoviscana Formation continued after the onset of the Tilcarian-Pampean orogeny. We propose that the Puncoviscana Formation rocks older than 530. Ma were deposited in the arc-trench gap of the west-facing Pampean arc and/or the associated trench, whereas the rocks younger than 530. Ma were deposited in a syn-collision foreland basin. The Puncoviscana Formation rocks were progressively assembled into a west-younging accretionary complex, consistent with the style of deformation and low-grade metamorphism. The age of the syn-collision plutons (≤530. Ma) suggest the foredeep deposits record the transition from trench to foreland basin, due to arrival of the Arequipa-Antofalla block at the west-facing trench at ca. 530. Ma. Our geochronological and Pb-isotope investigations suggest that the Arequipa-Antofalla terrane was a coherent, ribbon-shaped crustal block that also included the western part of the Pampia terrane. A compilation of existing U-Pb zircon studies suggests that the Pampean arc extended along the length of the proto-Andean margin of West Gondwana, represented by the previously amalgamated Amazonia and Rio de La Plata cratons, and probably was initiated during the late Ediacaran after 600. Ma.Following earlier workers, we reaffirm that the Arequipa-Antofalla block was originally separating Laurentia and Amazonia in Rodinia. It probably rifted from Laurentia during the Ediacaran between 600 and 570. Ma, following an earlier departure of Amazonia (∼650. Ma?). The separation of Arequipa-Antofalla from Amazonia and Laurentia opened the Puncoviscana and Iapetus oceans respectively. © 2011 Elsevier Ltd. Fil:Escayola, M.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08959811_v32_n4_p438_Escayola
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Arequipa Antofalla
Puncoviscana Ocean
Tilcarian-Pampean orogeny
accretionary prism
Cambrian
deposition
Ediacaran
foreland basin
geochronology
Gondwana
Laurentia
lead isotope
low grade metamorphism
pluton
tectonic setting
unconformity
Argentina
spellingShingle Arequipa Antofalla
Puncoviscana Ocean
Tilcarian-Pampean orogeny
accretionary prism
Cambrian
deposition
Ediacaran
foreland basin
geochronology
Gondwana
Laurentia
lead isotope
low grade metamorphism
pluton
tectonic setting
unconformity
Argentina
Escayola, M.P.
van Staal, C.R.
Davis, W.J.
The age and tectonic setting of the Puncoviscana Formation in northwestern Argentina: An accretionary complex related to Early Cambrian closure of the Puncoviscana Ocean and accretion of the Arequipa-Antofalla block
topic_facet Arequipa Antofalla
Puncoviscana Ocean
Tilcarian-Pampean orogeny
accretionary prism
Cambrian
deposition
Ediacaran
foreland basin
geochronology
Gondwana
Laurentia
lead isotope
low grade metamorphism
pluton
tectonic setting
unconformity
Argentina
description TIMS and SHRIMP U-Pb zircon geochronology of selected parts of the Puncoviscana Formation suggest its deposition took place mainly during the Early Cambrian, coeval with 540-535. Ma calc-alkaline Pampean arc volcanism mainly preserved as tuff beds in the oldest identified parts of this unit. Syn- to post-tectonic plutons constrains the Tilcarian-Pampean orogeny to have occurred between ca. 530. Ma and deposition of the unconformably overlying Middle-Upper Cambrian Meson Group. Deposition of the Puncoviscana Formation continued after the onset of the Tilcarian-Pampean orogeny. We propose that the Puncoviscana Formation rocks older than 530. Ma were deposited in the arc-trench gap of the west-facing Pampean arc and/or the associated trench, whereas the rocks younger than 530. Ma were deposited in a syn-collision foreland basin. The Puncoviscana Formation rocks were progressively assembled into a west-younging accretionary complex, consistent with the style of deformation and low-grade metamorphism. The age of the syn-collision plutons (≤530. Ma) suggest the foredeep deposits record the transition from trench to foreland basin, due to arrival of the Arequipa-Antofalla block at the west-facing trench at ca. 530. Ma. Our geochronological and Pb-isotope investigations suggest that the Arequipa-Antofalla terrane was a coherent, ribbon-shaped crustal block that also included the western part of the Pampia terrane. A compilation of existing U-Pb zircon studies suggests that the Pampean arc extended along the length of the proto-Andean margin of West Gondwana, represented by the previously amalgamated Amazonia and Rio de La Plata cratons, and probably was initiated during the late Ediacaran after 600. Ma.Following earlier workers, we reaffirm that the Arequipa-Antofalla block was originally separating Laurentia and Amazonia in Rodinia. It probably rifted from Laurentia during the Ediacaran between 600 and 570. Ma, following an earlier departure of Amazonia (∼650. Ma?). The separation of Arequipa-Antofalla from Amazonia and Laurentia opened the Puncoviscana and Iapetus oceans respectively. © 2011 Elsevier Ltd.
format JOUR
author Escayola, M.P.
van Staal, C.R.
Davis, W.J.
author_facet Escayola, M.P.
van Staal, C.R.
Davis, W.J.
author_sort Escayola, M.P.
title The age and tectonic setting of the Puncoviscana Formation in northwestern Argentina: An accretionary complex related to Early Cambrian closure of the Puncoviscana Ocean and accretion of the Arequipa-Antofalla block
title_short The age and tectonic setting of the Puncoviscana Formation in northwestern Argentina: An accretionary complex related to Early Cambrian closure of the Puncoviscana Ocean and accretion of the Arequipa-Antofalla block
title_full The age and tectonic setting of the Puncoviscana Formation in northwestern Argentina: An accretionary complex related to Early Cambrian closure of the Puncoviscana Ocean and accretion of the Arequipa-Antofalla block
title_fullStr The age and tectonic setting of the Puncoviscana Formation in northwestern Argentina: An accretionary complex related to Early Cambrian closure of the Puncoviscana Ocean and accretion of the Arequipa-Antofalla block
title_full_unstemmed The age and tectonic setting of the Puncoviscana Formation in northwestern Argentina: An accretionary complex related to Early Cambrian closure of the Puncoviscana Ocean and accretion of the Arequipa-Antofalla block
title_sort age and tectonic setting of the puncoviscana formation in northwestern argentina: an accretionary complex related to early cambrian closure of the puncoviscana ocean and accretion of the arequipa-antofalla block
url http://hdl.handle.net/20.500.12110/paper_08959811_v32_n4_p438_Escayola
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