Produção Nacional
EVOLUÇÃO TECTÔNICA DO CINTURÃO DOM FELICIANO NO ESCUDO SUL-RIO-GRANDENSE: PARTE II - UMA CONTRIBUIÇÃO A PARTIR DAS ASSINATURAS GEOFÍSICAS
1995; Sociedade Brasileira de Geologia; Volume: 25; Issue: 4 Linguagem: Inglês
10.5327/rbg.v25i4.540
ISSN2317-4889
AutoresLuis Alberto D‘Ávila Fernandes, Rualdo Menegat, Antônio Flávio Uberti Costa, Edinei Koester, Carla Cristine Porcher, Andreia Tommasi, Gustavo Kraemer, Gilberto Emílio Ramgrab, Eduardo Camozzato,
Tópico(s)Geography and Environmental Studies
ResumoThe recognition of three geophysical domains has permitted a re-evaluation of the geotectonic models proposed for the precambrian rocks of the Sul-rio-grandense shield. The eastern, central and western geophysical domains are separated by important gravimetric and aeromagnetic discontinuities and consist of assemblages of rocks with petrogenetic characteristics of specific tectonic environments. The eastern domain includes two neoproterozoic calc-alkaline plutonic sequences, typical of active margin environments, and developed upon reworked eoproterozoic basement. It is separated from the central domain by the Porto Alegre Suture, which is marked by a gravimetric and aeromagnetic anomaly. The central compartment is sub-di vided into two segments by the Cacapava Suture, marked by an aeromagnetic anomaly. Its central-eastern segment consists of tectonically reworked eoproterozoic basement rocks and the central-western segment is composed of juvenile neoproterozoic crust. It is separated from the western geophysical compartment by the Sao Gabriel Suture, that is the boundary between the Rio de La Plata Craton to the west and the Dom Feliciano Belt, to the east. The geophysical data ha ve allowed a more precise definition of the nature and boundaries of some of the petrotectonic assemblages recognised, in addition to making it possible to test and discuss the tectonic models proposed for the Sul-rio-grandense shield from a methodological and epistemological point of view
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