The Sierra Norte-Ambargasta batholith: Late Ediacaran-Early Cambrian magmatism associated with Pampean transpressional tectonics
Iannizzotto, Noelia F.; Rapela, Carlos W; Baldo, Edgardo; Galindo, Carmen; Fanning, Christopher; Pankhurst, Robert J
The Sierra Norte-Ambargasta batholith is one of the largest plutonic expressions of the Pampean orogeny in western Argentina. A thorough petrographic, geochemical, isotopic (Sr and Nd) and geochronological (U-Pb SHRIMP) study is reported. The batholith comprises granitoid rocks that may be subdivided into those affected by Pampean D2 dextral shearing and mylonization and those emplaced after deformation had ceased; representative samples gave U-Pb zircon ages of 537 ± 4 Ma and 530 ± 4 Ma...[Show more]
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