%0 Journal Article
%A Casquet Martín, César
%A Pankhurst, R.J.
%A Rapela, Carlos W.
%A Galindo Francisco, María Del Carmen
%A Dahlquist, Juan A.
%A Baldo, Edgardo G.
%A Saavedra, Julio
%A González Casado, José Manuel
%A Fanning, C.M.
%T Grenvillian massif-typeanorthosites in the SierrasPampeanas
%D 2004
%@ 0016-7649
%U https://hdl.handle.net/20.500.14352/49546
%X We report the discovery of massif-type anorthositesin the Andean basement of the WesternSierras Pampeanas of Argentina. U–Pb zircondating (by sensitive high-resolution ionmicroprobe) of a cogenetic gabbronorite dyke yields ages of1070 ± 41 Ma for igneous emplacement and 431 ± 40 Ma formetamorphism. These anorthosites are petrologically andgeochemically comparable with those of the Grenville provinceof Laurentia. Palaeogeographical reconstructions ofRodinia at 1.0–1.1 Ga suggest that the Sierras Pampeanasanorthosites were part of a large anorthosite province in thelate Mesoproterozoic.
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