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Abstract:

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.

Registro:

Documento: Artículo
Título:Ordovician metamorphic event in the carbonate platform of the Argentine Precordillera: Implications for the geotectonic evolution of the proto-Andean margin of Gondwana
Autor:Voldman, G.G.; Albanesi, G.L.; Ramos, V.A.
Filiación:CONICET, Museo de Paleontología, Universidad Nacional de Córdoba, Córdoba X5000FCO, Argentina
CONICET, Laboratorio de Tectónica Andina, Universidad de Buenos Aires, Buenos Aires C1428EHA, Argentina
Palabras clave: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
Año:2009
Volumen:37
Número:4
Página de inicio:311
Página de fin:314
DOI: http://dx.doi.org/10.1130/G25540A.1
Título revista:Geology
Título revista abreviado:Geology
ISSN:00917613
CODEN:GLGYB
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00917613_v37_n4_p311_Voldman

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Citas:

---------- APA ----------
Voldman, G.G., Albanesi, G.L. & Ramos, V.A. (2009) . Ordovician metamorphic event in the carbonate platform of the Argentine Precordillera: Implications for the geotectonic evolution of the proto-Andean margin of Gondwana. Geology, 37(4), 311-314.
http://dx.doi.org/10.1130/G25540A.1
---------- CHICAGO ----------
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" . Geology 37, no. 4 (2009) : 311-314.
http://dx.doi.org/10.1130/G25540A.1
---------- MLA ----------
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" . Geology, vol. 37, no. 4, 2009, pp. 311-314.
http://dx.doi.org/10.1130/G25540A.1
---------- VANCOUVER ----------
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. Geology. 2009;37(4):311-314.
http://dx.doi.org/10.1130/G25540A.1