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Svisero, D.P.; Scheibe, L.F.
Sociedade Brasileira de Geologia, Sao Paulo1985
Sociedade Brasileira de Geologia, Sao Paulo1985
AbstractAbstract
[en] Magnetic, radiometric and gamma spectrometric surveys have been carried out on the Janjao diatreme which outcrops near Lajes in central-east Santa Catarina State, Brazil. The body is deeply weathered on the surface and its concentrates contain serpentinized olivine, phlogopote, pyroxenes, ilmenites, garnet and zircon. The interpretation of the magnetic anomaly revealed an irregular diatreme whose main dimensions are 50 X 190 meters. A vertical to subvertical dyke cuts the main diatreme. The radiometric anomaly as well as the potassium content helped to delineate the contacts between the diatreme and its country rocks (sandstones). Faults striking NNE controlled the emplacement of the Janjao diatreme as well as the intrusion of an alkaline dyke located near the diatreme. (Author)
[pt]
Levantamentos magneticos, radiometricos e gamaespectrometricos foram reliazados no diatrema Janjao que aflora nas proximidades de Lages na regiao centro-leste do estado de Santa Catarina. O corpo apresenta um nivel de intemperismo, acelerado na superficie e seus concentrados contem olivina serpentinizada, flogopita, piroxenios, ilmenitas, granada e zircao. A interpretacao da anomalia magnetica revelou um diatrema irregular com dimensoes de 50 X 190 metros. Um dique vertical a subvertical atravessa o diatrema principal. A anomalia radiometrica assim como o conteudo potassico auxiliaram na demarcacao dos contatos entre o diatrema e a rocha encaixante (arenitos). Falhas com direcao estrutural NNE controlaram a colocao do diatrema Janjao assim como a intrusao de um dique alcalino localizado nas proximidades do diatrema. (D.J.M.)Original Title
Magnetometria, radiometria e gamaespectrometria na diatrema Janjao, Lages, SC
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1985; 12 p; 2. Geology South Brazilian Symposium; Florianopolis, SC (Brazil); Oct 1985
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Miscellaneous
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Conference
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