Delimitacion de los terrenos tectonoestratigraficos de la region centro-austral Argentina: evidencias aeromagneticas.
Delimitation of tectonostratigraphic terranes of the southern-central region of Argentina: aeromagnetic evidences.
| dc.contributor | en-US | |
| dc.contributor | es-ES | |
| dc.creator | Chernicoff, Carlos J. | |
| dc.creator | Zappettini, Eduardo O. | |
| dc.date | 2010-06-29 | |
| dc.identifier | http://www.andeangeology.cl/index.php/revista1/article/view/V30n2-a09 | |
| dc.identifier | 10.5027/andgeoV30n2-a09 | |
| dc.description | La interpretacion de datos aeromagneticos de alta resolucion en la Provincia de La Pampa sumados a informacion magnetica de baja densidad en los ambitos de las Cuencas Neuquina y del Colorado, permiten precisar los limites de los terrenos Chilenia, Cuyania, Pampia y Patagonia, y del Craton del Rio de la Plata en la region analizada. En particular, los datos aeromagneticos de alta resolucion son contrastados con la informacion geologica disponible y se discriminan asi once unidades litomagneticas pre-cenozoicas y dos cenozoicas, representadas en un mapa de geologia solida de esta region ampliamente cubierta por sedimentos cuaternarios. Asimismo se identifican estructuras de diverso orden y su cronologia relativa: fallas de caracter regional de primer orden; fallas, fracturas y zonas de cizalla de caracter subregional, asi como la fabrica magnetica mas conspicua del basamento que refleja sus principales estructuras planares. Se diferencian tres unidades de caracteristicas magneticas contrastantes en el basamento interpretados como integrantes de los terrenos tectonoestratigraficos Cuyania y Pampia y del Craton del Rio de la Plata, separados por discontinuidades de primer orden. Una discontinuidad del mismo tipo separa a los terrenos Chilenia y Cuyania, en el sector occidental de la zona de estudio. En el extremo sur del area investigada se hacen dominantes las estructuras de rumbo WNW, en particular un corrimiento mayor, de vergencia NNE, que marca el truncamiento austral de la sutura Cuyania-Pampia. Un maximo regional magnetico y una anomalia residual de Bouguer positiva, dispuestos conformando un arco de orientacion este-oeste convexo hacia el norte y localizados inmediatamente al sur de los 39°S, senalan la interrupcion de la estructuracion submeridional de los terrenos Chilenia, Cuyania y Pampia al norte de los mismos; representarian la zona de sutura entre el terreno Patagonia y Gondwana, cuya activacion durante el Mesozoico dio lugar a la Dorsal de Huincul. | es-ES |
| dc.description | The geological interpretation of the high-resolution aeromagnetic data of the La Pampa province, in addition to the low-density magnetic information from the region of the Neuquina and Colorado basins, leads to define the precise boundaries of the Chilenia, Cuyania, Pampia and Patagonia terranes, and the Río de la Plata Craton within the study region. The data from the high-resolution. aeromagnetic survey, in particular, are compared and studied in conjunction with all the available geological information. This results in a map of the solid geology of this region largely covered by Quaternary sediments, in which eleven pre-Cenozoic and two-Cenozoic lithomagnetic units are represented. A number of structures of different magnitudes, as well as their relative chronology, are also recognized, i.e., regional faulting, sub-regional faulting/fracturing/shearing and the most conspicuous magnetic fabric of the basement which reflects its main planar structures. Three different basements are distinguished on the basis of their contrasting magnetic character, and are interpreted to integrate the Cuyania and Pampia terranes and the Río de la Plata craton, separated from each other by large-scale discontinuities. In the western part of the study region an additional master discontinuity separates the Chilenia and Cuyania terranes. In the southernmost area, WNW-trending structures are predominant, particularly a master NNE-vergent thrust that indicates the truncation of the cuyana-Pampia suture and is regarded to be related to the collision of the patagonia terrane. An east-west - trending, convex to the north, arch-shaped regional magnetic high and an equally shaped positive residual Bouguer anomaly located immediately to the south of 39°S, whose activation, during the Mesozoic gave rise to the Huincul Dorsal, indicate the interruption of the distinct submeridional structures of the Chilenia, Cuyania and Pampia terranes to the north and would represent the suture zone of the Patagonia terrane with Gondwana. | en-US |
| dc.format | application/pdf | |
| dc.format | text/html | |
| dc.language | eng | |
| dc.publisher | Servicio Nacional de Geología y Minería | en-US |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/view/V30n2-a09/577 | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/view/V30n2-a09/html | |
| dc.source | Andean Geology; Vol 30, No 2 (2003); 299-316 | es-ES |
| dc.source | Andean Geology; Vol 30, No 2 (2003); 299-316 | en-US |
| dc.source | 0718-7106 | |
| dc.source | 0718-7092 | |
| dc.title | Delimitacion de los terrenos tectonoestratigraficos de la region centro-austral Argentina: evidencias aeromagneticas. | es-ES |
| dc.title | Delimitation of tectonostratigraphic terranes of the southern-central region of Argentina: aeromagnetic evidences. | en-US |
| dc.type | info:eu-repo/semantics/article | |
| dc.type | info:eu-repo/semantics/publishedVersion | |
| dc.type | es-ES | |
| dc.type | en-US |
This item appears in the following Collection(s)
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Andean Geology
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