Record of high-grade metamorphism in the Paleoproterozoic basement of the Campinas Municipality (SP)
Introduction. Despite significant urbanization, the municipality of Campinas preserves an interesting lithostructural diversity that includes sedimentary, volcanic, plutonic, and medium- to high-grade metamorphic rocks. Two well-defined shear zones cross the municipality in a NE direction. In the re...
| Autores: | , |
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2025 |
| País: | Brasil |
| Recursos: | Universidade Estadual de Campinas (UNICAMP) |
| Repositório: | Revista Terrae didatica (Online) |
| Idioma: | português |
| OAI Identifier: | oai:ojs.periodicos.sbu.unicamp.br:article/8678585 |
| Acesso em linha: | https://periodicos.sbu.unicamp.br/ojs/index.php/td/article/view/8678585 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Geological mapping Metamorphism Basement Southern Brasilia Orogen Mapeamento geológico Metamorfismo Embasamento Orógeno Brasília Sul Cartografía geológica Basamento Orógeno Brasilia Sur |
| Resumo: | Introduction. Despite significant urbanization, the municipality of Campinas preserves an interesting lithostructural diversity that includes sedimentary, volcanic, plutonic, and medium- to high-grade metamorphic rocks. Two well-defined shear zones cross the municipality in a NE direction. In the regional geotectonic context, rocks from the Paraná Basin outcrop in the western part of the municipality, basement rocks of the Southern Brasília Orogen in the central portion, and plutonic suites corresponding to the Socorro Nappe in the far western part of Campinas. Objective. Methodology. This study aims to characterize the rocks of the central portion of the city through detailed-scale geological mapping (1:10000) and petrographic descriptions of the lithotypes identified in the municipal ecological park. Results. Four distinct units were described in the study area: i) Augen gneisses; ii) Garnet-biotite granulites/gneisses; iii) Garnet-bearing amphibolites and associated metamafic rocks; iv) Granitoids and lenticular pegmatites. Conclusion. The petrological data presented revealed the presence of microtextural features such as plagioclase rims around garnet and symplectites of clinopyroxene, plagioclase, and ilmenite, suggesting that these rocks formed under high-pressure conditions. |
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