| Revista: | Revista brasileira de geofisica |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000279656 |
| ISSN: | 0102-261X |
| Autors: | Guimaraes, Gilson1 Ferreira, Francisco2 Ulbrich, Horstpeter3 Forlin, Maximilian |
| Institucions: | 1Universidade Estadual de Ponta Grossa, Departamento de Geociencias, Ponta Grossa, Parana. Brasil 2Universidade Federal do Parana, Departamento de Geologia, Curitiba, Parana. Brasil 3Universidade de Sao Paulo, Instituto de Geociencias, Sao Paulo. Brasil |
| Any: | 2001 |
| Període: | Ene-Abr |
| Volum: | 19 |
| Número: | 1 |
| Paginació: | 3-18 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, analítico |
| Resumen en inglés | This paper analyses sprectrometric data of the Aerogeophysical Project Serra do Mar Sul (APSMS) in the Meso to Neoproterozoic basement of eastern Paraná state, southern Brazil. Three main lithostratigraphic units are found, elongated N30-40E. The easternmost is the Três Córregos Granitic Complex (TCGC), constituted by calc-alkaline granites and their mega-enclaves. The central unit is the low-grade metamorphic Itaiacoca Group. The western strip is occupied by the mostly calc-alkaline Cunhaporanga Granitic Complex (CGC), also with large enclaves. Further west, the molassic volcano-sedimentary Eopaleozoic Castro Group, deposited in a graben, overlies unconformably the CGC. The Devonian sandstone Furnas Formation, to the west, is the main unit of the Paraná Basin in this region. The Cretaceous Banhadão alkaline massif (8 km²) intrudes the TCGC. The heavily weathered central-northern area of the CGC is in part covered by the alluvial deposits of the Iapó drainage basin. Data were corrected with a cosine directional filter (degree 6), and presented as cps (counts per second). U and K give answers that may be spurious, not always correlated with the geology. Most CGC intrusions present rather high Th-U, lower total (TC) and very low K counts, as opposed to the values found in the TCGC. High TC are found in some of the more evolved plutons within the CGC (e.g., the A-type Serra do Carambeí Granite). The TCGC granites can be divided into two radiometric domains, one adjacent to the Itaiacoca belt and another to the E-SE (visible in TC and |
| Disciplines | Geociencias |
| Paraules clau: | Geofísica, Geología, Aerogamaespectrometría, Mapeo geológico, Brasil |
| Keyword: | Earth sciences, Geology, Geophysics, Airborne gamma ray, Geological mapping, Brazil |
| Text complet: | Texto completo (Ver HTML) |
