Grenvillian massif-type anorthosites in the Sierras Pampeanas

Casquet, Cesar; Pankhurst, Robert J; Rapela, Carlos W; Galindo, Carmen; Dahlquist, Juan A.; Baldo, Edgardo; Saavedra, J; Gonzalez-Casado, Jose M; Fanning, Christopher

Grenvillian massif-type anorthosites in the Sierras Pampeanas

Date

2004

Authors

Casquet, Cesar

Pankhurst, Robert J

Rapela, Carlos W

Galindo, Carmen

Dahlquist, Juan A.

Baldo, Edgardo

Saavedra, J

Gonzalez-Casado, Jose M

Fanning, Christopher

Publisher

Geological Society of London

Abstract

We report the discovery of massif-type anorthosites in the Andean basement of the Western Sierras Pampeanas of Argentina. U-Pb zircon dating (by sensitive high-resolution ion microprobe) of a cogenetic gabbronorite dyke yields ages of 1070 ± 41 Ma for ig