Artículo
Abstract:
In the south of Santiago del Estero Province and in the north of Cordoba Province, the regional outcrops of Late Precambrian igneous-metamorphic basement show a N to NE tectonic trend which varies from the mainly N-S trend of the hills of central and southern Cordoba ranges. This ancient basement is dominated by granites and acidic porphyritic rocks which are best exposed in the Ambargasta Hills. Minor outcrops of medium-high grade metamorphic rocks (gneisses, schists, amphibolites and marbles) are better exposed in the central and southern. Cordoba ranges. In the main, this paper deals with unconformable overlying Eopalaeozoic folded quartzose sandstones, conglomerates and pelitic hornfels that compose the El Escondido and La Clemira formations, almost exclusively confined to the Ambargasta hills. The folded rocks are partially affected by contact metamorphism associated with intrusive granites dated as being of Late Cambrian (K/Ar 517± 15 Ma, intruding La Clemira Formation) and Carboniferous age (K/Ar 325±10 Ma, intruding in El Escondido Formation). The lithologic characteristics and location of these units, at the western boundary of the Chacoparana Basin, allow correlation with the subsurface marine Early Paleozoic units of that basin. However, tectonic studies by means of statistical mapping of ductile deformation structures (So; fold axis measurements), show the preservation of D2 (328) and D3 (18) deformations of Late Cambrian to Ordovician-Silurian age in El Escondido Formation, and recognized in several locations in the regional Late Precambrian metamorphic rocks of the Cordoba Pampean ranges. The stratigraphical position of the La Clemira and El Escondido Formations is restricted to the Cambrian-Early Ordovician, and could probably correlate with Las Brenas Formation or the Cambrian-Ordovician deposits of the Las Brenas Basin. A modification of the boundary of the Early Paleozoic Chacoparana and the Las Brenas basins is therefore suggested, extending them towards the southwest over the southern Santiago del Estero Hills.
Registro:
| Documento: | Artículo |
| Título: | Ductile deformation phases in eopalaeozoic formations in the Sierra de Ambargasta, Santiago del Estero and their stratigraphical significance |
| Autor: | Massabie, A.; Mutti, D.; Sanguinetti, A.; Cegarra, M.; Mozetic, M. |
| Filiación: | Depto. de Ciencias Geológicas, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, 1428 Buenos Aires, Argentina |
| Palabras clave: | ductile deformation; lithostratigraphy; Paleozoic; Argentina |
| Año: | 1997 |
| Volumen: | 52 |
| Número: | 2 |
| Página de inicio: | 209 |
| Página de fin: | 218 |
| Título revista: | Revista de la Asociacion Geologica Argentina |
| Título revista abreviado: | Rev. Asoc. Geol. Argent. |
| ISSN: | 00044822 |
| PDF: | https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00044822_v52_n2_p209_Massabie.pdf |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v52_n2_p209_Massabie |
Referencias:
- Beder, R., Los yacimientos de minerales de manganeso en el norte de la Provincia de Córdoba y sur de Santiago del Estero (1931) Anales Museo Nacional de Historia Natural, 36, pp. 431-502
- Bodenbender, G., La sierra Norte de Córdoba. Constitución geológica y productos minerales de aplicación (1905) Anales Ministerio de Agricultura de la Nación, Sección Geología, 1 (2)
- Castellote, P., La Formación La Clemira y edad de su metamorfismo (1982) Acta Geológica Lilloana, 16 (1), pp. 71-76
- Castellote, P., Algunas observaciones geológicas en las sierras de Ambargasta y Sumampa (Provincia de Santiago el Estero) (1985) Acta Geológica Lilloana, 16 (2), pp. 259-269
- Cingolani, C., Varela, R., Geocronología Rubidio-Estroncio de rocas ígneas y metamórficas de la Sierra Chica y Grande de Córdoba (1975) Actas 2° Congreso Ibero-Americano de Geología Económica, 1, pp. 9-35
- Dalla Salda, L., La estructura íntima de Ias Sierras de Córdoba (1984) Revista de la Asociación Geológica Argentina, 39 (1-2), pp. 38-52
- Dalla Salda, L., Basament tectonics of southern Pampean Ranges, Argentine (1987) Tectonics, 6 (3), pp. 249-260
- Dalla Salda, L., Cingolani, C., Varela, R., Early Paleozoic orogenic belt of the Andes in southwestern South America: Result of Laurentia-Gondwana collision? (1992) Geology, 20, pp. 617-620
- Fernández Garrasino, C., Tendencias evolutivas de la Cuenca Chacoparanense y posibilidades exploratorias de la Mesopotamia y Tucumán oriental (Argentina) (1989) Actas 1° Congreso Nacional de Exploración de Hidrocarburos, 1, pp. 433-464
- Quartino, B., Massabie, A., Morelli, J., Formaciones eopaleozoicas en el norte de Córdoba y sur de Santiago del Estero, su magmatismo y significado geológico (1978) Revista de la Asociación Geológica Argentina, 33 (1), pp. 90-92
- Ramsay, J., (1967) Folding and Fracturing of Rocks, 590p. , McGraw-Hill, London
- Rapela, C., Coira, Toselli, B.A., Saavedra, J., El magmatismo del Paleozoico inferior en el Sudoeste de Gondwana (1992) Paleozoico Inferior de Ibero-América, pp. 21-68. , Gutierrez Marco, J. G., Saavedra, J. y Rabano, I. (Eds.): España
- Rickard, M., A classification diagram for fold orientations (1971) Geological Magazine, 108 (1), pp. 23-26
- Russo, A., Ferello, R., Chebli, G., Llanura Chaco Pampeana (1979) Actas 2° Simposio Geología Regional Argentina, 1, pp. 139-184. , Academia Nacional de Ciencias de Córdoba
Citas:
---------- APA ----------
Massabie, A., Mutti, D., Sanguinetti, A., Cegarra, M. & Mozetic, M. (1997) . Ductile deformation phases in eopalaeozoic formations in the Sierra de Ambargasta, Santiago del Estero and their stratigraphical significance . Revista de la Asociacion Geologica Argentina, 52(2), 209-218.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v52_n2_p209_Massabie [ ]
---------- CHICAGO ----------
Massabie, A., Mutti, D., Sanguinetti, A., Cegarra, M., Mozetic, M. "Ductile deformation phases in eopalaeozoic formations in the Sierra de Ambargasta, Santiago del Estero and their stratigraphical significance " . Revista de la Asociacion Geologica Argentina 52, no. 2 (1997) : 209-218.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v52_n2_p209_Massabie [ ]
---------- MLA ----------
Massabie, A., Mutti, D., Sanguinetti, A., Cegarra, M., Mozetic, M. "Ductile deformation phases in eopalaeozoic formations in the Sierra de Ambargasta, Santiago del Estero and their stratigraphical significance " . Revista de la Asociacion Geologica Argentina, vol. 52, no. 2, 1997, pp. 209-218.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v52_n2_p209_Massabie [ ]
---------- VANCOUVER ----------
Massabie, A., Mutti, D., Sanguinetti, A., Cegarra, M., Mozetic, M. Ductile deformation phases in eopalaeozoic formations in the Sierra de Ambargasta, Santiago del Estero and their stratigraphical significance . Rev. Asoc. Geol. Argent. 1997;52(2):209-218.Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v52_n2_p209_Massabie [ ]
