Geodynamic evolution of the Eastern Sierras Pampeanas (Central Argentina) based on geochemical, Sm-Nd, Pb-Pb and SHRIMP data

Whole-rock geochemical analyses using major and trace elements in combination with the Sm-Nd and Pb-Pb isotope systems, together with SHRIMP age dating on metasedimentary rocks from the Sierras de Chepes, the Sierras de Córdoba, the Sierra Norte and the San Luis Formation in the Sierra de San Luis,...

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Autores principales: Drobe, M., de Luchi, M.L., Steenken, A., Wemmer, K., Naumann, R., Frei, R., Siegesmund, S.
Formato: JOUR
Materias:
Eastern Sierras Pampeanas
Geodynamic evolution
Gondwana margin
Provenance
Tectonic setting
age determination
geochemistry
geodynamics
Gondwana
lead-lead dating
metamorphism
samarium-neodymium dating
SHRIMP dating
tectonic setting
Argentina
Sierras Pampeanas
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_14373254_v100_n2_p631_Drobe
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_14373254_v100_n2_p631_Drobe2023-10-03T16:15:58Z Geodynamic evolution of the Eastern Sierras Pampeanas (Central Argentina) based on geochemical, Sm-Nd, Pb-Pb and SHRIMP data Drobe, M. de Luchi, M.L. Steenken, A. Wemmer, K. Naumann, R. Frei, R. Siegesmund, S. Eastern Sierras Pampeanas Geodynamic evolution Gondwana margin Provenance Tectonic setting age determination geochemistry geodynamics Gondwana lead-lead dating metamorphism samarium-neodymium dating SHRIMP dating tectonic setting Argentina Sierras Pampeanas Whole-rock geochemical analyses using major and trace elements in combination with the Sm-Nd and Pb-Pb isotope systems, together with SHRIMP age dating on metasedimentary rocks from the Sierras de Chepes, the Sierras de Córdoba, the Sierra Norte and the San Luis Formation in the Sierra de San Luis, have been carried out to unravel the provenance and the geodynamic history of the Eastern Sierras Pampeanas, Central Argentina. The geochemical and the Sm-Nd data point to a slightly stronger mafic and less-fractionated material in the provenance area of the Sierras de Córdoba when compared to the other units. The TDM model ages from the Sierras de Chepes (~1.82 Ga) and the Sierra Norte (~1.79 Ga) are significantly older than the data from the Sierras de Córdoba (1.67 Ga). The Pb data are homogeneous for the different units. Only the 208Pb/204Pb ratios of some samples from the Sierras de Córdoba are higher. A late Pampean detrital zircon peak around 520 Ma from the Sierras de Chepes is in accordance with the new data from the San Luis Formation. This is similar to the literature data from the Famatina Belt located to the northwest of the Sierras de Chepes and also fits the detrital zircon peaks in the Mesón group. These maximum depositional ages were also reported from some locations in the Puncoviscana Formation but are absent in the Sierras de Córdoba. An improved model for the development of the Eastern Sierras Pampeanas in the area between the Sierras de Córdoba and the Puncoviscana Formation is provided. This gives new insights into the late Pampean development of the Sierra de San Luis and the complex development of the Eastern Sierras Pampeanas. This new model explains the younger detrital ages in the Puncoviscana Formation compared with the older ages of the Sierras de Córdoba. Another model of the Sierra de San Luis explains the younger depositional ages of the Pringles Metamorphic Complex and the San Luis Formation when compared to the Nogolí Metamorphic Complex and the Conlara Metamorphic Complex. Additionally, the rather fast change of the high-grade metamorphic conditions in the Pringles Metamorphic Complex and the low-grade metamorphic conditions in the San Luis Formation is explained by extension, the ascent of (ultra) mafic material and later folding and erosion. © 2010 The Author(s). JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_14373254_v100_n2_p631_Drobe
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Eastern Sierras Pampeanas
Geodynamic evolution
Gondwana margin
Provenance
Tectonic setting
age determination
geochemistry
geodynamics
Gondwana
lead-lead dating
metamorphism
samarium-neodymium dating
SHRIMP dating
tectonic setting
Argentina
Sierras Pampeanas
spellingShingle Eastern Sierras Pampeanas
Geodynamic evolution
Gondwana margin
Provenance
Tectonic setting
age determination
geochemistry
geodynamics
Gondwana
lead-lead dating
metamorphism
samarium-neodymium dating
SHRIMP dating
tectonic setting
Argentina
Sierras Pampeanas
Drobe, M.
de Luchi, M.L.
Steenken, A.
Wemmer, K.
Naumann, R.
Frei, R.
Siegesmund, S.
Geodynamic evolution of the Eastern Sierras Pampeanas (Central Argentina) based on geochemical, Sm-Nd, Pb-Pb and SHRIMP data
topic_facet Eastern Sierras Pampeanas
Geodynamic evolution
Gondwana margin
Provenance
Tectonic setting
age determination
geochemistry
geodynamics
Gondwana
lead-lead dating
metamorphism
samarium-neodymium dating
SHRIMP dating
tectonic setting
Argentina
Sierras Pampeanas
description Whole-rock geochemical analyses using major and trace elements in combination with the Sm-Nd and Pb-Pb isotope systems, together with SHRIMP age dating on metasedimentary rocks from the Sierras de Chepes, the Sierras de Córdoba, the Sierra Norte and the San Luis Formation in the Sierra de San Luis, have been carried out to unravel the provenance and the geodynamic history of the Eastern Sierras Pampeanas, Central Argentina. The geochemical and the Sm-Nd data point to a slightly stronger mafic and less-fractionated material in the provenance area of the Sierras de Córdoba when compared to the other units. The TDM model ages from the Sierras de Chepes (~1.82 Ga) and the Sierra Norte (~1.79 Ga) are significantly older than the data from the Sierras de Córdoba (1.67 Ga). The Pb data are homogeneous for the different units. Only the 208Pb/204Pb ratios of some samples from the Sierras de Córdoba are higher. A late Pampean detrital zircon peak around 520 Ma from the Sierras de Chepes is in accordance with the new data from the San Luis Formation. This is similar to the literature data from the Famatina Belt located to the northwest of the Sierras de Chepes and also fits the detrital zircon peaks in the Mesón group. These maximum depositional ages were also reported from some locations in the Puncoviscana Formation but are absent in the Sierras de Córdoba. An improved model for the development of the Eastern Sierras Pampeanas in the area between the Sierras de Córdoba and the Puncoviscana Formation is provided. This gives new insights into the late Pampean development of the Sierra de San Luis and the complex development of the Eastern Sierras Pampeanas. This new model explains the younger detrital ages in the Puncoviscana Formation compared with the older ages of the Sierras de Córdoba. Another model of the Sierra de San Luis explains the younger depositional ages of the Pringles Metamorphic Complex and the San Luis Formation when compared to the Nogolí Metamorphic Complex and the Conlara Metamorphic Complex. Additionally, the rather fast change of the high-grade metamorphic conditions in the Pringles Metamorphic Complex and the low-grade metamorphic conditions in the San Luis Formation is explained by extension, the ascent of (ultra) mafic material and later folding and erosion. © 2010 The Author(s).
format JOUR
author Drobe, M.
de Luchi, M.L.
Steenken, A.
Wemmer, K.
Naumann, R.
Frei, R.
Siegesmund, S.
author_facet Drobe, M.
de Luchi, M.L.
Steenken, A.
Wemmer, K.
Naumann, R.
Frei, R.
Siegesmund, S.
author_sort Drobe, M.
title Geodynamic evolution of the Eastern Sierras Pampeanas (Central Argentina) based on geochemical, Sm-Nd, Pb-Pb and SHRIMP data
title_short Geodynamic evolution of the Eastern Sierras Pampeanas (Central Argentina) based on geochemical, Sm-Nd, Pb-Pb and SHRIMP data
title_full Geodynamic evolution of the Eastern Sierras Pampeanas (Central Argentina) based on geochemical, Sm-Nd, Pb-Pb and SHRIMP data
title_fullStr Geodynamic evolution of the Eastern Sierras Pampeanas (Central Argentina) based on geochemical, Sm-Nd, Pb-Pb and SHRIMP data
title_full_unstemmed Geodynamic evolution of the Eastern Sierras Pampeanas (Central Argentina) based on geochemical, Sm-Nd, Pb-Pb and SHRIMP data
title_sort geodynamic evolution of the eastern sierras pampeanas (central argentina) based on geochemical, sm-nd, pb-pb and shrimp data
url http://hdl.handle.net/20.500.12110/paper_14373254_v100_n2_p631_Drobe
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