Resumen

CISTERNA, C.E.. La Majada magmatic belt, Sierra de Ancasti, Catamarca: Petrological and structural characterization. Rev. Asoc. Geol. Argent. [online]. 2003, vol.58, n.1, pp. 20-30. ISSN 0004-4822.

La Majada area occur within a NNW-SSE trending along 40 kilometers in the SE Catamarca province. Is formed by schists and gneisses where the first schistosity (D₁) is tightly folded and transposed by a second deformation (D₂), which is coeval with the peak metamorphism (M₂) and magmatism. Synkinematic granitoids emplacements are two different suites of igneous rocks : a) a magmatic sequence, consisting of small gabbro - diorite bodies and tonalite, granodiorite and monzogranite plutons; and b) granites, leucogranites and pegmatites. The relations between folds and crenulation cleavage in the metamorphic rocks and deformational fabrics in the granitoids and migmatites provide good evidence for the penecontemporaneity of deformational processes, magmatism and migmatization.

Palabras llave : Sierra de Ancasti; Early Paleozoic; Deformation; Magmatism.