INGEIS 05370
INSTITUTO DE GEOCRONOLOGIA Y GEOLOGIA ISOTOPICA
Unidad Ejecutora - UE
artículos
Título:
Post-pampean cooling and the exhumation of the Sierras Pampeanas in the west of Córdoba (central Argentina)
Autor/es:
WEMMER,K.; STEENKEN, A.; MARTINO, R.D.; LOPEZ DE LUCHI, M.G.; GUERESCHI, A.; SIEGESMUND, S.
Revista:
NEUES JAHRBUCH FUR MINERALOGIE-ABHANDLUNGEN
Editorial:
E SCHWEIZERBARTSCHE VERLAGS
Referencias:
Lugar: Stuttgart; Año: 2010
ISSN:
0077-7757
Resumen:
An extensive survey on the cooling history by K/Ar biotite and muscovite dating of
the basement rocks of the Sierras de Córdoba (Argentina) and San Luis (Argentina) was carried out
and interpreted in terms of a differential uplift history of the different blocks. Large pegmatitic
muscovites from the Sierras de Córdoba record Late Cambrian to Early Ordovician ages. Beginning
of cooling in the Sierra de San Luis is documented by muscovite booklets from pegmatites yielding
ages between 448 Ma and 438 Ma. The limit between those age domains is marked by the Los
Túneles and Guacha Corral shear zones accommodating the vertical displacement. Constraints by
K/Ar mica ages and structural observations suggest two principal phases of compression around
480 Ma and 430 Ma. The latter coincides with the final collision of the Cuyania Terrane to the
western outboard of Gondwana. The Pachango Shear Zone, which cuts the Los Túneles Shear Zone
records the latest phase of ductile deformation in the Late Silurian.
