Per citar aquest document: http://ddd.uab.cat/record/85799
New SHRIMP U-Pb data from the Famatina Complex : constraining Early-Mid Ordovician Famatinian magmatism in the Sierras Pampeanas, Argentina
Dahlquist, J.A. (CICTERRA-CONICET-UNC)
Pankhurst, R.J. (British Geological Survey)
Washington Rapela, Carlos (CIG-CONICET-UNLP)
Galindo, C. (Universidad Complutense de Madrid. Departamento de Petrología y Geoquímica)
Alasino, Pablo (CRILAR-CONICET)
Fanning, Mark (Research School of Earth Sciences)
Saavedra, Julio (Centro Superior de Investigaciones Científicas. Instituto de Recursos Naturales y Agrobiología)
Baldo, Edgardo G. (CICTERRA-CONICET-UNC)

Data: 2008
Resum: 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.
Drets: 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, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l’obra original i es reconegui l’autoria de l’obra original. Creative Commons
Llengua: Anglès.
Document: article ; recerca ; publishedVersion
Matèria: Famatina Complex ; SHRIMP U-Pb data ; Magmatism ; Ensialic Basins
Publicat a: Geologica acta, Vol. 6, Núm. 4 (Desembre 2008) , p. 319-333, ISSN 1696-5728

Adreça alternativa: http://www.raco.cat/index.php/GeologicaActa/article/view/129845
DOI: 10.1344/105.000000260


15 p, 1.2 MB

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