RT Journal Article
T1 Grenvillian massif-typeanorthosites in the SierrasPampeanas
A1 Casquet, César
A1 Pankhurst, R.J.
A1 Rapela, Carlos W.
A1 Galindo Francisco, Mª del Carmen
A1 Dahlquist, Juan A.
A1 Baldo, Edgardo G.
A1 Saavedra, Julio
A1 González Casado, José Manuel
A1 Fanning, C.M.
AB 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.
PB Geological Society of London.
SN 0016-7649
YR 2004
FD 2004-01
LK https://hdl.handle.net/20.500.14352/49546
UL https://hdl.handle.net/20.500.14352/49546
LA eng
DS Docta Complutense
RD 3 may 2024