Figure 10
Compositional variation diagrams for the main mafic minerals in the Papanduva and Quiriri Plutons, Morro Redondo Complex.
(a) (Si + Na + K) vs. (Ca +
IVAl) cationic plots showing the compositional evolution of amphiboles from the Morro Redondo Complex (i). In (ii) and (iii), compositional trends registered for other plutons from the Graciosa Province are portrayed for comparison: 1, Serra da Graciosa Plutons, alkaline association (
Gualda and Vlach 2007bGualda GAR and Vlach SRF. 2007b. The Serra da Graciosa A-type Granites and Syenites, southern Brazil. Part 2: Petrographic and mineralogical evolution of the alkaline and aluminous associations. Lithos 93: 310-327.,
cGualda GAR and Vlach SRF. 2007c. The Serra da Graciosa A-type Granites and Syenites, southern Brazil Part 3: Magmatic evolution and post-magmatic breakdown of amphiboles of the alkaline association. Lithos 93: 328-339.); 2, Serra da Graciosa Plutons, aluminous association (
Gualda and Vlach 2007bGualda GAR and Vlach SRF. 2007b. The Serra da Graciosa A-type Granites and Syenites, southern Brazil. Part 2: Petrographic and mineralogical evolution of the alkaline and aluminous associations. Lithos 93: 310-327.,
2007cGualda GAR and Vlach SRF. 2007c. The Serra da Graciosa A-type Granites and Syenites, southern Brazil Part 3: Magmatic evolution and post-magmatic breakdown of amphiboles of the alkaline association. Lithos 93: 328-339.); 3, Mandira Massif, alkaline association (
Santos and Vlach 2010Santos CA and Vlach SRF. 2010. Variações composicionais em anfibólios e biotita de granitos do Maciço Mandira, Província Graciosa de Granitos e Sienitos de Tipo (A). In: CONGRESSO BRASILEIRO DE GEOLOGIA 45, Belém, PA, Brasil, Anais (CD).); 4, Mandira Massif, aluminous association (
Santos and Vlach 2010Santos CA and Vlach SRF. 2010. Variações composicionais em anfibólios e biotita de granitos do Maciço Mandira, Província Graciosa de Granitos e Sienitos de Tipo (A). In: CONGRESSO BRASILEIRO DE GEOLOGIA 45, Belém, PA, Brasil, Anais (CD).); 5, Corupá Pluton, alkaline association (Garin 2003). Nomenclature of ideal amphibole end-members are shown in (iv). End-members with the A position completely vacant fall along the lower line; end-members with the A position completely filled fall along the upper line.
(b)Na–Mg–(Fe
2+ + Mn) cationic plots showing the compositions of clinopyroxenes in the Papanduva Pluton (i). In (ii) compositional trends observed in other plutons from the alkaline association in the Graciosa Province are shown: 1, Corupá Pluton (Garin 2003); 2, Serra da Graciosa Plutons (
Gualda and Vlach 2007bGualda GAR and Vlach SRF. 2007b. The Serra da Graciosa A-type Granites and Syenites, southern Brazil. Part 2: Petrographic and mineralogical evolution of the alkaline and aluminous associations. Lithos 93: 310-327.).
(c)
IVAl vs. Fe/(Fe+Mg) cationic plots for biotite of Quiriri Pluton (i). In (ii), compositional trends for other aluminous occurrences from the Graciosa Province are drawn for comparision: 1, Serra da Graciosa Plutons (
Gualda and Vlach 2007bGualda GAR and Vlach SRF. 2007b. The Serra da Graciosa A-type Granites and Syenites, southern Brazil. Part 2: Petrographic and mineralogical evolution of the alkaline and aluminous associations. Lithos 93: 310-327.); 2, Mandira Massif (
Santos and Vlach 2010Santos CA and Vlach SRF. 2010. Variações composicionais em anfibólios e biotita de granitos do Maciço Mandira, Província Graciosa de Granitos e Sienitos de Tipo (A). In: CONGRESSO BRASILEIRO DE GEOLOGIA 45, Belém, PA, Brasil, Anais (CD).); 3, Desemborque (Guaraú) Pluton (R.P. Garcia and S.R.F. Vlach unpublished data). Symbols as in
Fig. 5.