Gamaespectrometria terrestre aplicada as rochas vulcânicas da província magmática do Paraná

• Autor(a) principal: Kanashiro, Daniel Kenzi [UNESP]
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/155466; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-06-05/000884238.pdf
• topic: Rochas igneas; Espectrometria de raio gama; Petrologia; Parana

The Magmatic Province of Parana (PMP), scope of this work, was one of the biggest continental volcanic floods during the lower cretaceous, covering areas around 2Mkm². In Brazil, this province is composed by three types of volcanic rocks. The first one, majority in the province, is composed by tholeiitic basalt. The second type, with subordinate volumes in the province is composed by andesitic rocks with tholeiitic affinity. The last type and the least common is composed by acidic rocks (rhyodacite-rhyolite) and are classified into two groups: The afitic rocks of Palmas type (ATP) and the porphyritic rocks of Chapecó type (ATC). Although the extensive literature about the lithotypes of PMP, there's still many problems about the understanding of the stratigraphic stacking and the evolutive relations between the basic, intermediate and acidic types of the province. Therefore, the main objective of this work consists in the use of in-situ gamma spectrometry data to find out the potential of this method in the differentiation of the main volcanic rock types of PMP. For this, an association of this gamma spectrometric data with chemical analysis and petrography will be compared to identify patterns that could be used in the future to facilitate the identification and mapping of these volcanic rocks in field work