Early Cambrian U-Pb zircon age and Hf-Isotope data from the Guasayán pluton, Sierras Pampeanas, Argentina: implications for the northwestern boundary of the Pampean arc
An Early Cambrian pluton, known as the Guasayán pluton, has been identified in the central area of Sierra de Guasayán, northwestern Argentina. A U-Pb zircon Concordia age of 533±4 Ma was obtained by LA-MC-ICP-MS and represents the first report of robustly dated Early Cambrian magmatism for the north...
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| Autores principales: | , , , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
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2016
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/86520 |
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I19-R120-10915-86520 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Naturales Hf isotopes Pampean granites Sierra de Guasayán U-Pb Geochronology |
| spellingShingle |
Ciencias Naturales Hf isotopes Pampean granites Sierra de Guasayán U-Pb Geochronology Dahlquist, Juan A. Verdecchia, Sebastián O. Baldo, Edgardo G. Basei, Miguel A. S. Alasino, Pablo H. Urán, Gimena A. Rapela, Carlos Washington Costa Campos Neto, Mario da Zandomeni, Priscila S. Early Cambrian U-Pb zircon age and Hf-Isotope data from the Guasayán pluton, Sierras Pampeanas, Argentina: implications for the northwestern boundary of the Pampean arc |
| topic_facet |
Ciencias Naturales Hf isotopes Pampean granites Sierra de Guasayán U-Pb Geochronology |
| description |
An Early Cambrian pluton, known as the Guasayán pluton, has been identified in the central area of Sierra de Guasayán, northwestern Argentina. A U-Pb zircon Concordia age of 533±4 Ma was obtained by LA-MC-ICP-MS and represents the first report of robustly dated Early Cambrian magmatism for the northwestern Sierras Pampeanas. The pluton was emplaced in low-grade metasedimentary rocks and its magmatic assemblage consists of K-feldspar (phenocrysts)+plagioclase+quartz+biotite, with zircon, apatite, ilmenite, magnetite and monazite as accessory minerals. Geochemically, the granitic rock is a metaluminous subalkaline felsic granodiorite with SiO<SUB>2</SUB>=69.24%, Na<SUB>2</SUB>O+K<SUB>2</SUB>O=7.08%, CaO=2.45%, Na<SUB>2</SUB>O/ K<SUB>2</SUB>O=0.71 and FeO/MgO=3.58%. Rare earth element patterns show moderate slope (La<SUB>N</SUB>/Yb<SUB>N</SUB>=8.05) with a slightly negative Eu anomalies (Eu/Eu*=0.76). We report the first <i>in situ</i> Hf isotopes data (ε<SUB>Hft</SUB>=-0.12 to-4.76) from crystallized zircons in the Early Cambrian granites of the Sierras Pampeanas, helping to constrain the magma source and enabling comparison with other Pampean granites. The Guasayán pluton might provide a link between Early Cambrian magmatism of the central Sierras Pampeanas and that of the Eastern Cordillera, contributing to define the western boundary of the Pampean paleo-arc. |
| format |
Articulo Articulo |
| author |
Dahlquist, Juan A. Verdecchia, Sebastián O. Baldo, Edgardo G. Basei, Miguel A. S. Alasino, Pablo H. Urán, Gimena A. Rapela, Carlos Washington Costa Campos Neto, Mario da Zandomeni, Priscila S. |
| author_facet |
Dahlquist, Juan A. Verdecchia, Sebastián O. Baldo, Edgardo G. Basei, Miguel A. S. Alasino, Pablo H. Urán, Gimena A. Rapela, Carlos Washington Costa Campos Neto, Mario da Zandomeni, Priscila S. |
| author_sort |
Dahlquist, Juan A. |
| title |
Early Cambrian U-Pb zircon age and Hf-Isotope data from the Guasayán pluton, Sierras Pampeanas, Argentina: implications for the northwestern boundary of the Pampean arc |
| title_short |
Early Cambrian U-Pb zircon age and Hf-Isotope data from the Guasayán pluton, Sierras Pampeanas, Argentina: implications for the northwestern boundary of the Pampean arc |
| title_full |
Early Cambrian U-Pb zircon age and Hf-Isotope data from the Guasayán pluton, Sierras Pampeanas, Argentina: implications for the northwestern boundary of the Pampean arc |
| title_fullStr |
Early Cambrian U-Pb zircon age and Hf-Isotope data from the Guasayán pluton, Sierras Pampeanas, Argentina: implications for the northwestern boundary of the Pampean arc |
| title_full_unstemmed |
Early Cambrian U-Pb zircon age and Hf-Isotope data from the Guasayán pluton, Sierras Pampeanas, Argentina: implications for the northwestern boundary of the Pampean arc |
| title_sort |
early cambrian u-pb zircon age and hf-isotope data from the guasayán pluton, sierras pampeanas, argentina: implications for the northwestern boundary of the pampean arc |
| publishDate |
2016 |
| url |
http://sedici.unlp.edu.ar/handle/10915/86520 |
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Repositorios |
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1764820489769844738 |