Kaolinite, illite and quartz dissolution in the karstification of Paleozoic sandstones of the Furnas Formation, Paraná Basin, Southern Brazil - Melo, Mario Sergio de; Guimarães, Gilson Burigo; Chinelatto, Adilson; Giannini, Paulo César Fonseca; Pontes, Henrique S.; Chinelatto, Adriana; Atencio, Daniel (Journal of South American Earth Sciences, 2015)