New SHRIMP U-Pb data from the Famatina Complex : constraining Early-Mid Ordovician Famatinian magmatism in the Sierras Pampeanas, Argentina
Dahlquist, Juan Andrés (Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET))
Pankhurst, Robert John (British Geological Survey)
Washington Rapela, Carlos (CIG-CONICET-UNLP)
Galindo, Carmen (Universidad Complutense de Madrid. Departamento de Petrología y Geoquímica)
Alasino, Pablo (CRILAR-CONICET)
Fanning, Mark (Research School of Earth Sciences)
Saavedra, Julio (Instituto de Recursos Naturales y Agrobiología de Salamanca)
Baldo, Edgardo G. A. (Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET))

Fecha:	2008
Resumen:	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.
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Famatina Complex ; SHRIMP U-Pb data ; Magmatism ; Ensialic Basins
Publicado en:	Geologica acta, Vol. 6, Núm. 4 (Desembre 2008) , p. 319-333, ISSN 1696-5728

Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/129845
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000260
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/1926
DOI: 10.1344/105.000000260

15 p, 1.2 MB

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