Casquet, Cesar; Pankhurst, Robert J; Galindo, Carmen; Rapela, Carlos W; Fanning, Christopher; Baldo, Edgardo; Dahlquist, Juan A.; Gonzalez-Casado, Jose M; Colombo, Fernando
A deformed ca. 570 Ma syenite-carbonatite body is reported from a Grenville-age (1.0-1.2 Ga) terrane in the Sierra de Maz, one of the Western Sierras Pampeanas of Argentina. This is the first recognition of such a rock assemblage in the basement of the Central Andes. The two main lithologies are coarse-grained syenite (often nepheline-bearing) and enclave-rich fine-grained foliated biotite-calcite carbonatite. Samples of carbonatite and syenite yield an imprecise whole rock Rb-Sr isochron age...[Show more]
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