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Quantification of porosity evolution from unaltered to propylitic-altered granites: the 14C-PMMA method applied on the hydrothermal system of Lavras do Sul, Brazil Anais da ABC (AABC)
Bongiolo,Everton M.; Bongiolo,Daniela E.; Sardini,Paul; Mexias,André S.; Siitari-Kauppi,Marja; Gomes,Márcia E.B.; Formoso,Milton L.L..
This work is an application of the 14C-Polymethylmethacrylate method to compare the porosity evolution between unaltered and propylitic-altered granites, using samples from Lavras do Sul region, Brazil. This method, when coupled with optical and electronic petrography has the advantage over other methods to provide the quantification and identification of total and local porosity of rocks. From petrographic observations, different kinds of porous zones were identified and quantified (microfractures, grain boundaries, alteration of minerals, etc). Results show that unaltered granites have 0.5 to 0.6% porosity and propylitic-altered ones have 1.7 to 1.8% porosity, even between samples with different textures. Porosity of altered rocks increases mainly due to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Porosity quantification; 14C-PMMA method; Granite porosity; Hydrothermal alteration; Propylitic alteration; Lavras do Sul.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300011
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