Abstract
We report U-Pb ages of detrital zircons from samples of five Neoproterozoic sandstone units deposited on the Rio de la Plata Craton (RPC) in Uruguay and Argentina. Quartz-arenites of the Piedras de Afilar Formation show typical Transamazonian ages, with peaks at 2.00-2.07, 1.87 and 1.78 Ga. However, the most important zircon population is Mesoproterozoic, showing maxima at 1.49, 1.35, 1.25 and 1.0 Ga. Zircons recovered from two sandstone levels in the Arroyo del Soldado Group (Yerbal and Cerros San Francisco formations) are mostly Archean in age, with maxima at 3.2 and 2.7 Ga. Palaeoproterozoic zircons are also prominent in this unit, with peaks at 2.45 and 2.18, with the latter a typical Transamazonian age. Two samples from the Sierras Bayas Group in Tandilia (Argentina) show different age spectra. Sandstones of the Villa Monica Formation show a unimodal zircon population of Transamazonian age (peak at 2.13 Ga). Sandstones of the Cerro Largo Formation are characterized by a dominant Transamazonian zircon population (peaks at 2.15, 2.0 and 1.79), but also important Archean-lowermost Palaeoproterozoic (3.33, 2.99, 2.7, 2.47 Ga) and Mesoproterozoic peaks (1.55, 1.23 and 1.06). The abundance of Mesoproterozoic detrital zircons is surprising. A proto-Andean, Mesoproterozoic belt is suggested as the source
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Gaucher, C. , E-mail: gaucher@chasque.net;
[1]
Poire, D G;
Pamoukaghlian, K;
Gomez Peral, L. , E-mail: poire@cig.museo.unlp.edu.ar, E-mail: esmectita90@gmail.com;
[2]
Finney, S. , E-mail: scfinney@csulb.edu;
[3]
Valencia, V;
[4]
Blanco, G
- Facultad de Ciencias, Montevideo(Uruguay)
- Centro de Investigaciones Geologicas, UNLP-CONICET, La Plata (Argentina)
- Department of Geological Sciences, California State University Long Beach, Long Beach, (United States)
- Geosciences, University of Arizona (United States)
Citation Formats
Gaucher, C. , E-mail: gaucher@chasque.net, Poire, D G, Pamoukaghlian, K, Gomez Peral, L. , E-mail: poire@cig.museo.unlp.edu.ar, E-mail: esmectita90@gmail.com, Finney, S. , E-mail: scfinney@csulb.edu, Valencia, V, and Blanco, G.
Detrital zircons from samples of five Neo proterozoic sandstone units deposited on Uruguay and Argentina: about evolution of paleographic Rio de la Plata craton; Zircones detriticos de secuencias neoproterozoicas de Uruguay y Argentina: inferencias sobre la evolucion paleogeografica del craton del Rio de la Plata.
Uruguay: N. p.,
2007.
Web.
Gaucher, C. , E-mail: gaucher@chasque.net, Poire, D G, Pamoukaghlian, K, Gomez Peral, L. , E-mail: poire@cig.museo.unlp.edu.ar, E-mail: esmectita90@gmail.com, Finney, S. , E-mail: scfinney@csulb.edu, Valencia, V, & Blanco, G.
Detrital zircons from samples of five Neo proterozoic sandstone units deposited on Uruguay and Argentina: about evolution of paleographic Rio de la Plata craton; Zircones detriticos de secuencias neoproterozoicas de Uruguay y Argentina: inferencias sobre la evolucion paleogeografica del craton del Rio de la Plata.
Uruguay.
Gaucher, C. , E-mail: gaucher@chasque.net, Poire, D G, Pamoukaghlian, K, Gomez Peral, L. , E-mail: poire@cig.museo.unlp.edu.ar, E-mail: esmectita90@gmail.com, Finney, S. , E-mail: scfinney@csulb.edu, Valencia, V, and Blanco, G.
2007.
"Detrital zircons from samples of five Neo proterozoic sandstone units deposited on Uruguay and Argentina: about evolution of paleographic Rio de la Plata craton; Zircones detriticos de secuencias neoproterozoicas de Uruguay y Argentina: inferencias sobre la evolucion paleogeografica del craton del Rio de la Plata."
Uruguay.
@misc{etde_21233057,
title = {Detrital zircons from samples of five Neo proterozoic sandstone units deposited on Uruguay and Argentina: about evolution of paleographic Rio de la Plata craton; Zircones detriticos de secuencias neoproterozoicas de Uruguay y Argentina: inferencias sobre la evolucion paleogeografica del craton del Rio de la Plata}
author = {Gaucher, C. , E-mail: gaucher@chasque.net, Poire, D G, Pamoukaghlian, K, Gomez Peral, L. , E-mail: poire@cig.museo.unlp.edu.ar, E-mail: esmectita90@gmail.com, Finney, S. , E-mail: scfinney@csulb.edu, Valencia, V, and Blanco, G}
abstractNote = {We report U-Pb ages of detrital zircons from samples of five Neoproterozoic sandstone units deposited on the Rio de la Plata Craton (RPC) in Uruguay and Argentina. Quartz-arenites of the Piedras de Afilar Formation show typical Transamazonian ages, with peaks at 2.00-2.07, 1.87 and 1.78 Ga. However, the most important zircon population is Mesoproterozoic, showing maxima at 1.49, 1.35, 1.25 and 1.0 Ga. Zircons recovered from two sandstone levels in the Arroyo del Soldado Group (Yerbal and Cerros San Francisco formations) are mostly Archean in age, with maxima at 3.2 and 2.7 Ga. Palaeoproterozoic zircons are also prominent in this unit, with peaks at 2.45 and 2.18, with the latter a typical Transamazonian age. Two samples from the Sierras Bayas Group in Tandilia (Argentina) show different age spectra. Sandstones of the Villa Monica Formation show a unimodal zircon population of Transamazonian age (peak at 2.13 Ga). Sandstones of the Cerro Largo Formation are characterized by a dominant Transamazonian zircon population (peaks at 2.15, 2.0 and 1.79), but also important Archean-lowermost Palaeoproterozoic (3.33, 2.99, 2.7, 2.47 Ga) and Mesoproterozoic peaks (1.55, 1.23 and 1.06). The abundance of Mesoproterozoic detrital zircons is surprising. A proto-Andean, Mesoproterozoic belt is suggested as the source of the Mesoproterozoic detritus. Archean rocks of the RPC crop out only in the Nico Perez Terrane in Uruguay, suggesting that the Nico Perez Terrane was much closer to Tandilia than it is today. The sinistral reactivation of the Sarandi del Yi Shear Zone in the Cambrian, as a result of tangential collision of the Cuchilla Dionisio-Pelotas Terrane, may explain this observations. The absence of Neoproterozoic zircons shows that the studied units were deposited in a stable continental margin opening to the East and South. These Neoproterozoic basins had obviously no contribution whatsoever from Brasiliano-Pan African belts, supporting the idea of Cambrian terrane accretion as the mechanism responsible for the present configuration of the Rio de la Plata Craton and the final amalgamation of Gondwana.}
place = {Uruguay}
year = {2007}
month = {Jul}
}
title = {Detrital zircons from samples of five Neo proterozoic sandstone units deposited on Uruguay and Argentina: about evolution of paleographic Rio de la Plata craton; Zircones detriticos de secuencias neoproterozoicas de Uruguay y Argentina: inferencias sobre la evolucion paleogeografica del craton del Rio de la Plata}
author = {Gaucher, C. , E-mail: gaucher@chasque.net, Poire, D G, Pamoukaghlian, K, Gomez Peral, L. , E-mail: poire@cig.museo.unlp.edu.ar, E-mail: esmectita90@gmail.com, Finney, S. , E-mail: scfinney@csulb.edu, Valencia, V, and Blanco, G}
abstractNote = {We report U-Pb ages of detrital zircons from samples of five Neoproterozoic sandstone units deposited on the Rio de la Plata Craton (RPC) in Uruguay and Argentina. Quartz-arenites of the Piedras de Afilar Formation show typical Transamazonian ages, with peaks at 2.00-2.07, 1.87 and 1.78 Ga. However, the most important zircon population is Mesoproterozoic, showing maxima at 1.49, 1.35, 1.25 and 1.0 Ga. Zircons recovered from two sandstone levels in the Arroyo del Soldado Group (Yerbal and Cerros San Francisco formations) are mostly Archean in age, with maxima at 3.2 and 2.7 Ga. Palaeoproterozoic zircons are also prominent in this unit, with peaks at 2.45 and 2.18, with the latter a typical Transamazonian age. Two samples from the Sierras Bayas Group in Tandilia (Argentina) show different age spectra. Sandstones of the Villa Monica Formation show a unimodal zircon population of Transamazonian age (peak at 2.13 Ga). Sandstones of the Cerro Largo Formation are characterized by a dominant Transamazonian zircon population (peaks at 2.15, 2.0 and 1.79), but also important Archean-lowermost Palaeoproterozoic (3.33, 2.99, 2.7, 2.47 Ga) and Mesoproterozoic peaks (1.55, 1.23 and 1.06). The abundance of Mesoproterozoic detrital zircons is surprising. A proto-Andean, Mesoproterozoic belt is suggested as the source of the Mesoproterozoic detritus. Archean rocks of the RPC crop out only in the Nico Perez Terrane in Uruguay, suggesting that the Nico Perez Terrane was much closer to Tandilia than it is today. The sinistral reactivation of the Sarandi del Yi Shear Zone in the Cambrian, as a result of tangential collision of the Cuchilla Dionisio-Pelotas Terrane, may explain this observations. The absence of Neoproterozoic zircons shows that the studied units were deposited in a stable continental margin opening to the East and South. These Neoproterozoic basins had obviously no contribution whatsoever from Brasiliano-Pan African belts, supporting the idea of Cambrian terrane accretion as the mechanism responsible for the present configuration of the Rio de la Plata Craton and the final amalgamation of Gondwana.}
place = {Uruguay}
year = {2007}
month = {Jul}
}