Ordovician metamorphic event in the carbonate platform of the Argentine Precordillera: Implications for the geotectonic evolution of the proto-Andean margin of Gondwana

An Ordovician metamorphic event is recorded by means of conodont paleothermometry in the slope sedimentary sequences of the Western Precordillera. Allochthonous conodonts from reworked deposits of the eastern carbonate platform with CAI 4.5-5 and autochthonous conodonts from the olistostrome matrix...

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Autores principales: Voldman, G.G., Albanesi, G.L., Ramos, V.A.
Formato: JOUR
Materias:
Basement rocks
Carbonate platforms
Data support
Deformation front
Devonians
Geotectonic evolution
Leading edge
matrix
Metamorphic age
Metamorphic events
Ordovician
Ordovician period
Sedimentary sequence
Time constraints
Carbonation
Stratigraphy
Structural geology
allochthon
autochthon
carbonate platform
conodont
deformation
foreland basin
Gondwana
metamorphism
tectonic evolution
Precordillera
South America
Lenodus variabilis
Paltodus deltifer
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00917613_v37_n4_p311_Voldman
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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_00917613_v37_n4_p311_Voldman2023-10-03T14:55:06Z Ordovician metamorphic event in the carbonate platform of the Argentine Precordillera: Implications for the geotectonic evolution of the proto-Andean margin of Gondwana Voldman, G.G. Albanesi, G.L. Ramos, V.A. Basement rocks Carbonate platforms Data support Deformation front Devonians Geotectonic evolution Leading edge matrix Metamorphic age Metamorphic events Ordovician Ordovician period Sedimentary sequence Time constraints Carbonation Stratigraphy Structural geology allochthon autochthon carbonate platform conodont deformation foreland basin Gondwana metamorphism Ordovician tectonic evolution Precordillera South America Lenodus variabilis Paltodus deltifer An Ordovician metamorphic event is recorded by means of conodont paleothermometry in the slope sedimentary sequences of the Western Precordillera. Allochthonous conodonts from reworked deposits of the eastern carbonate platform with CAI 4.5-5 and autochthonous conodonts from the olistostrome matrix with CAI 3 allow for constraining the metamorphic age within the Paltodus deltifer and Lenodus variabilis zones (i.e., ca. 480-465 Ma). The conodont data support an Ordovician instead of an alternative Devonian collision for the Cuyania terrane with the proto-Andean margin of Gondwana, which is consistent with the earlier proposed, but still contentious, microcontinent model. In the latter scenario, the collision of the Cuyania terrane caused unroofing and cannibalism of the leading edge of the carbonate succession and basement rocks. The erosion of these rocks supplied detritus and metamorphosed conodonts to the deeper basinal settings of the Western Precordillera. As the deformation front migrated into the peripheral foreland of the Eastern and Central Precordillera, nonmetamorphosed conodonts were eventually incorporated into the west-prograding synorogenic clastic wedge. The occurrence of allochthonous and autochthonous conodonts in the slope facies of the Western Precordillera provides a time constraint for the early accretion of the Cuyania terrane and its transition to an evolving foreland mountain system in the Ordovician period. © 2009 The Geological Society of America. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00917613_v37_n4_p311_Voldman
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Basement rocks
Carbonate platforms
Data support
Deformation front
Devonians
Geotectonic evolution
Leading edge
matrix
Metamorphic age
Metamorphic events
Ordovician
Ordovician period
Sedimentary sequence
Time constraints
Carbonation
Stratigraphy
Structural geology
allochthon
autochthon
carbonate platform
conodont
deformation
foreland basin
Gondwana
metamorphism
Ordovician
tectonic evolution
Precordillera
South America
Lenodus variabilis
Paltodus deltifer
spellingShingle Basement rocks
Carbonate platforms
Data support
Deformation front
Devonians
Geotectonic evolution
Leading edge
matrix
Metamorphic age
Metamorphic events
Ordovician
Ordovician period
Sedimentary sequence
Time constraints
Carbonation
Stratigraphy
Structural geology
allochthon
autochthon
carbonate platform
conodont
deformation
foreland basin
Gondwana
metamorphism
Ordovician
tectonic evolution
Precordillera
South America
Lenodus variabilis
Paltodus deltifer
Voldman, G.G.
Albanesi, G.L.
Ramos, V.A.
Ordovician metamorphic event in the carbonate platform of the Argentine Precordillera: Implications for the geotectonic evolution of the proto-Andean margin of Gondwana
topic_facet Basement rocks
Carbonate platforms
Data support
Deformation front
Devonians
Geotectonic evolution
Leading edge
matrix
Metamorphic age
Metamorphic events
Ordovician
Ordovician period
Sedimentary sequence
Time constraints
Carbonation
Stratigraphy
Structural geology
allochthon
autochthon
carbonate platform
conodont
deformation
foreland basin
Gondwana
metamorphism
Ordovician
tectonic evolution
Precordillera
South America
Lenodus variabilis
Paltodus deltifer
description An Ordovician metamorphic event is recorded by means of conodont paleothermometry in the slope sedimentary sequences of the Western Precordillera. Allochthonous conodonts from reworked deposits of the eastern carbonate platform with CAI 4.5-5 and autochthonous conodonts from the olistostrome matrix with CAI 3 allow for constraining the metamorphic age within the Paltodus deltifer and Lenodus variabilis zones (i.e., ca. 480-465 Ma). The conodont data support an Ordovician instead of an alternative Devonian collision for the Cuyania terrane with the proto-Andean margin of Gondwana, which is consistent with the earlier proposed, but still contentious, microcontinent model. In the latter scenario, the collision of the Cuyania terrane caused unroofing and cannibalism of the leading edge of the carbonate succession and basement rocks. The erosion of these rocks supplied detritus and metamorphosed conodonts to the deeper basinal settings of the Western Precordillera. As the deformation front migrated into the peripheral foreland of the Eastern and Central Precordillera, nonmetamorphosed conodonts were eventually incorporated into the west-prograding synorogenic clastic wedge. The occurrence of allochthonous and autochthonous conodonts in the slope facies of the Western Precordillera provides a time constraint for the early accretion of the Cuyania terrane and its transition to an evolving foreland mountain system in the Ordovician period. © 2009 The Geological Society of America.
format JOUR
author Voldman, G.G.
Albanesi, G.L.
Ramos, V.A.
author_facet Voldman, G.G.
Albanesi, G.L.
Ramos, V.A.
author_sort Voldman, G.G.
title Ordovician metamorphic event in the carbonate platform of the Argentine Precordillera: Implications for the geotectonic evolution of the proto-Andean margin of Gondwana
title_short Ordovician metamorphic event in the carbonate platform of the Argentine Precordillera: Implications for the geotectonic evolution of the proto-Andean margin of Gondwana
title_full Ordovician metamorphic event in the carbonate platform of the Argentine Precordillera: Implications for the geotectonic evolution of the proto-Andean margin of Gondwana
title_fullStr Ordovician metamorphic event in the carbonate platform of the Argentine Precordillera: Implications for the geotectonic evolution of the proto-Andean margin of Gondwana
title_full_unstemmed Ordovician metamorphic event in the carbonate platform of the Argentine Precordillera: Implications for the geotectonic evolution of the proto-Andean margin of Gondwana
title_sort ordovician metamorphic event in the carbonate platform of the argentine precordillera: implications for the geotectonic evolution of the proto-andean margin of gondwana
url http://hdl.handle.net/20.500.12110/paper_00917613_v37_n4_p311_Voldman
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AT albanesigl ordovicianmetamorphiceventinthecarbonateplatformoftheargentineprecordilleraimplicationsforthegeotectonicevolutionoftheprotoandeanmarginofgondwana
AT ramosva ordovicianmetamorphiceventinthecarbonateplatformoftheargentineprecordilleraimplicationsforthegeotectonicevolutionoftheprotoandeanmarginofgondwana
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