New SHRIMP U-Pb data from the Famatina Complex : Constraining Early-Mid Ordovician Famatinian magmatism in the Sierras Pampeanas, Argentina

New SHRIMP U-Pb zircon ages are reported for igneous and sedimentary rocks of the Famatina Complex, constraining the age of the magmatism and the ensialic basins. Together with whole-rock and isotope geochemistry for the igneous rocks from the complex, these ages indicate that the voluminous parenta...

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Autores principales: Dahlquist, Juan Andrés, Pankhurst, Robert J., Rapela, Carlos Washington, Galindo, Carmen, Alasino, Pablo Horacio, Fanning, Christopher M., Saavedra, John, Baldo, Edgardo Gaspar Agustín
Formato: Articulo
Lenguaje:Inglés
Publicado: 2008
Materias:
Geología
Ciencias Naturales
U-pb shrimp circon
Famatinian orogeny
Ensialic basins
Magmatism
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/97251
https://ri.conicet.gov.ar/11336/81550
http://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000260
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-97251
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Ciencias Naturales
U-pb shrimp circon
Famatinian orogeny
Ensialic basins
Magmatism
spellingShingle Geología
Ciencias Naturales
U-pb shrimp circon
Famatinian orogeny
Ensialic basins
Magmatism
Dahlquist, Juan Andrés
Pankhurst, Robert J.
Rapela, Carlos Washington
Galindo, Carmen
Alasino, Pablo Horacio
Fanning, Christopher M.
Saavedra, John
Baldo, Edgardo Gaspar Agustín
New SHRIMP U-Pb data from the Famatina Complex : Constraining Early-Mid Ordovician Famatinian magmatism in the Sierras Pampeanas, Argentina
topic_facet Geología
Ciencias Naturales
U-pb shrimp circon
Famatinian orogeny
Ensialic basins
Magmatism
description New SHRIMP U-Pb zircon ages are reported for igneous and sedimentary rocks of the Famatina Complex, constraining the age of the magmatism and the ensialic basins. Together with whole-rock and isotope geochemistry for the igneous rocks from the complex, these ages indicate that the voluminous parental magmas of metaluminous composition were derived by partial melting of an older lithosphere without significant asthenospheric contribution. This magmatism was initiated in the Early Ordovician (481 Ma). During the Mid-Late Ordovician, the magmatism ceased (463 Ma), resulting in a short-lived (no more than ~20 Ma) and relatively narrow (~100–150 km) magmatic belt, in contrast to the long-lived cordilleran magmatism of the Andes. The exhumation rate of the Famatina Complex was considerably high and the erosional stripping and deposition of Ordovician sediments occurred soon after of the emplacement of the igneous source rocks during the Early to mid-Ordovician. During the upper Mid Ordovician the clastic contribution was mainly derived from plutonic rocks. Magmatism was completely extinguished in the Mid Ordovician and the sedimentary basins closed in the early Late Ordovician.
format Articulo
Articulo
author Dahlquist, Juan Andrés
Pankhurst, Robert J.
Rapela, Carlos Washington
Galindo, Carmen
Alasino, Pablo Horacio
Fanning, Christopher M.
Saavedra, John
Baldo, Edgardo Gaspar Agustín
author_facet Dahlquist, Juan Andrés
Pankhurst, Robert J.
Rapela, Carlos Washington
Galindo, Carmen
Alasino, Pablo Horacio
Fanning, Christopher M.
Saavedra, John
Baldo, Edgardo Gaspar Agustín
author_sort Dahlquist, Juan Andrés
title New SHRIMP U-Pb data from the Famatina Complex : Constraining Early-Mid Ordovician Famatinian magmatism in the Sierras Pampeanas, Argentina
title_short New SHRIMP U-Pb data from the Famatina Complex : Constraining Early-Mid Ordovician Famatinian magmatism in the Sierras Pampeanas, Argentina
title_full New SHRIMP U-Pb data from the Famatina Complex : Constraining Early-Mid Ordovician Famatinian magmatism in the Sierras Pampeanas, Argentina
title_fullStr New SHRIMP U-Pb data from the Famatina Complex : Constraining Early-Mid Ordovician Famatinian magmatism in the Sierras Pampeanas, Argentina
title_full_unstemmed New SHRIMP U-Pb data from the Famatina Complex : Constraining Early-Mid Ordovician Famatinian magmatism in the Sierras Pampeanas, Argentina
title_sort new shrimp u-pb data from the famatina complex : constraining early-mid ordovician famatinian magmatism in the sierras pampeanas, argentina
publishDate 2008
url http://sedici.unlp.edu.ar/handle/10915/97251
https://ri.conicet.gov.ar/11336/81550
http://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000260
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