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Artículo

Weathering profiles in granites, Sierra Norte (Córdoba, Argentina)

Kirschbaum, Alicia MatildeIcon ; Martínez, Estela; Pettinari, Gisela Roxana; Herrero, Silvana Andrea
Fecha de publicación: 09/2005
Editorial: Pergamon-Elsevier Science Ltd
Revista: Journal of South American Earth Sciences
ISSN: 0895-9811
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Meteorología y Ciencias Atmosféricas

Resumen

Abstract: Two weathering profiles evolved on peneplain-related granites in Sierra Norte, Córdoba province, were examined. Several weathering levels, of no more than 2 m thickness, were studied in these profiles. They had developed from similar parent rock, which had been exposed to hydrothermal processes of varying intensity. Fracturing is the most notable feature produced by weathering; iron oxides and silica subsequently filled these fractures, conferring a breccia-like character to the rock. The clay minerals are predominantly illitic, reflecting the mineral composition of the protolith. Smaller amounts of interstratified I/S RO type are also present, as well as scarce caolinite+chlorite that originated from the weathering of feldspar and biotite, respectively. The geochemical parameters define the weathering as incipient, in contrast to the geomorphological characteristics of Sierra Norte, which point to a long weathering history. This apparent incompatibility could be due to the probable erosion of the more weathered levels of the ancient peneplains, of which only a few relicts remain. Similar processes have been described at different sites in the Sierras Pampeanas. Reconstruction and dating of the paleosurfaces will make it possible to set time boundaries on the weathering processes studied and adjust the paleographic and paleoclimatic interpretations of this great South American region.
Palabras clave: Granites , Sierras Pampeanas , Weathering Profiles
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/54250
DOI: https://dx.doi.org/10.1016/j.jsames.2005.06.001
URL: https://www.sciencedirect.com/science/article/pii/S0895981105000842
Colecciones
Articulos(IBIGEO)
Articulos de INST.DE BIO Y GEOCIENCIAS DEL NOA
Citación
Kirschbaum, Alicia Matilde; Martínez, Estela; Pettinari, Gisela Roxana; Herrero, Silvana Andrea; Weathering profiles in granites, Sierra Norte (Córdoba, Argentina); Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 19; 4; 9-2005; 479-493
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