Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina)
The application of the SHRIMP U/Pb dating technique to zircon and monazite of different rock types of the Sierras de Córdoba provides an important insight into the metamorphic history of the basement domains. Additional constraints on the Pampean metamorphic episode were gained by Pb/Pb stepwise lea...
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2010
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14373254_v99_n6_p1199_Siegesmund http://hdl.handle.net/20.500.12110/paper_14373254_v99_n6_p1199_Siegesmund |
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paper:paper_14373254_v99_n6_p1199_Siegesmund2023-06-08T16:15:47Z Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina) Eastern Sierras Pampeanas Geodynamic evolution Pampean and Famatinian cycles SHRIMP dating Sierras de Córdoba Titanite and Garnet Pb-Pb step-wise leaching accretion basement rock Cambrian garnet geodynamics leaching metamorphic rock metamorphism monazite P-T-t path Proterozoic SHRIMP dating tectonic evolution tectonic setting titanite uranium-lead dating zircon Argentina Sierras Pampeanas The application of the SHRIMP U/Pb dating technique to zircon and monazite of different rock types of the Sierras de Córdoba provides an important insight into the metamorphic history of the basement domains. Additional constraints on the Pampean metamorphic episode were gained by Pb/Pb stepwise leaching (PbSL) experiments on two titanite and garnet separates. Results indicate that the metamorphic history recorded by Crd-free gneisses (M2) started in the latest Neoproterozoic/earliest Cambrian (553 and 543 Ma) followed by the M4 metamorphism at ~530 Ma that is documented in the diatexites. Zircon ages of 492 Ma in the San Carlos Massif correlate partly with rather low Th/U ratios (<0.1) suggesting their growth by metamorphic fluids. This age is even younger than the PbSL titanite ages of 506 Ma. It is suggested that the fluid alteration relates to the beginning of the Famatinien metamorphic cycle in the neighbouring Sierra de San Luis and has not affected the titanite ages. The PTt evolution can be correlated with the plate tectonic processes responsible for the formation of the Pampean orogene, i.e., the accretion of the Pampean basement to the Río de La Plata craton (M2) and the later collision of the Western Pampean basement with the Pampean basement. © 2009 The Author(s). 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14373254_v99_n6_p1199_Siegesmund http://hdl.handle.net/20.500.12110/paper_14373254_v99_n6_p1199_Siegesmund |
| 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 Pampean and Famatinian cycles SHRIMP dating Sierras de Córdoba Titanite and Garnet Pb-Pb step-wise leaching accretion basement rock Cambrian garnet geodynamics leaching metamorphic rock metamorphism monazite P-T-t path Proterozoic SHRIMP dating tectonic evolution tectonic setting titanite uranium-lead dating zircon Argentina Sierras Pampeanas |
| spellingShingle |
Eastern Sierras Pampeanas Geodynamic evolution Pampean and Famatinian cycles SHRIMP dating Sierras de Córdoba Titanite and Garnet Pb-Pb step-wise leaching accretion basement rock Cambrian garnet geodynamics leaching metamorphic rock metamorphism monazite P-T-t path Proterozoic SHRIMP dating tectonic evolution tectonic setting titanite uranium-lead dating zircon Argentina Sierras Pampeanas Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina) |
| topic_facet |
Eastern Sierras Pampeanas Geodynamic evolution Pampean and Famatinian cycles SHRIMP dating Sierras de Córdoba Titanite and Garnet Pb-Pb step-wise leaching accretion basement rock Cambrian garnet geodynamics leaching metamorphic rock metamorphism monazite P-T-t path Proterozoic SHRIMP dating tectonic evolution tectonic setting titanite uranium-lead dating zircon Argentina Sierras Pampeanas |
| description |
The application of the SHRIMP U/Pb dating technique to zircon and monazite of different rock types of the Sierras de Córdoba provides an important insight into the metamorphic history of the basement domains. Additional constraints on the Pampean metamorphic episode were gained by Pb/Pb stepwise leaching (PbSL) experiments on two titanite and garnet separates. Results indicate that the metamorphic history recorded by Crd-free gneisses (M2) started in the latest Neoproterozoic/earliest Cambrian (553 and 543 Ma) followed by the M4 metamorphism at ~530 Ma that is documented in the diatexites. Zircon ages of 492 Ma in the San Carlos Massif correlate partly with rather low Th/U ratios (<0.1) suggesting their growth by metamorphic fluids. This age is even younger than the PbSL titanite ages of 506 Ma. It is suggested that the fluid alteration relates to the beginning of the Famatinien metamorphic cycle in the neighbouring Sierra de San Luis and has not affected the titanite ages. The PTt evolution can be correlated with the plate tectonic processes responsible for the formation of the Pampean orogene, i.e., the accretion of the Pampean basement to the Río de La Plata craton (M2) and the later collision of the Western Pampean basement with the Pampean basement. © 2009 The Author(s). |
| title |
Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina) |
| title_short |
Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina) |
| title_full |
Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina) |
| title_fullStr |
Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina) |
| title_full_unstemmed |
Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina) |
| title_sort |
time constraints on the tectonic evolution of the eastern sierras pampeanas (central argentina) |
| publishDate |
2010 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14373254_v99_n6_p1199_Siegesmund http://hdl.handle.net/20.500.12110/paper_14373254_v99_n6_p1199_Siegesmund |
| _version_ |
1768544149672296448 |