3 documents found, page 1 of 1
The pyroclastic dyke and welded crystal tuff of the Morro dos Gatos alkaline in...
Motoki,Akihisa; Geraldes,Mauro Cesar; Iwanuch,Woldemar; Vargas,Thais; Motoki,Kenji Freire; Balmant,Alex; Ramos,Marina NascimentoThe present article reports the geologic, lithologic, and petrographic characteristics of the pyroclastic dyke and phenocryst-rich welded crystal tuff of the Morro dos Gatos alkaline intrusive body, State of Rio de Janeiro, Brazil. The intrusive complex has an extension of 1.2 x 0.8 km occupying an area of 0.5 km². It is constituted mainly by monzonite and trachyte. At the south flank of the massif, there exits...
Tectonic breccia of the Cabo Frio area, State of Rio de Janeiro, Brazil, intrud...
Motoki,Akihisa; Vargas,Thais; Iwanuch,Woldemar; Sichel,Susanna Eleonora; Balmant,Alex; Aires,José RibeiroThis paper presents the field descriptions and microscopic observations of a tectonic breccia in the basement gneiss of the Cabo Frio and Arraial do Cabo areas, State of Rio de Janeiro, Brazil, and its intrusive contact with the Early Cretaceous mafic dyke. At the sea cliff close to the Ilha do Japonês, there is an excellent contact outcrop between them. The tectonic breccia zone is 10 to 20m wide and has N30ºE...
Quantitative colour analyses using digital specification technique for Mármore ...
Motoki,Akihisa; Neves,José Luíz Peixoto; Vargas,ThaisThe authors have performed based on digital quantitative colour specification in whole rock and spots using a scanner, a computer, and original colour analysing software Wilbur for Mármore Bege Bahia, an ornamental limestone of breccia-like texture exploited in the centre-north region of Bahia, Brazil. The rock is characterised by light (B=83.4), vivid (S=10.8), and relatively homogeneous (sigma(H)=3.9; sigma(B...