Petrografia, geoquímica e suscetibilidade magnética do granito Gradaús, Província Carajás, SE do Pará

Abstract

The Gradaús Granite (1882±9 M.y.), located in Pará State, to the West of Bannach city and to the North of Cumaru do Norte, southeastern portion of Amazonian Craton, it is an anorogenic batholith with an area approximately 800 km², it is part of an intense granitic magmatism event that occurred during the Paleoproterzoic in the Carajás Province. It outcrops metasedimentary rocks of Rio Fresco Group, which lays on archean units of Rio Maria Domain. It compreends two distinct petrographic group: monzogranitics, composed by biotite-monzogranite and porfiritic-biotite-monzogranite, and syenogranitics, composed by biotite-anfibolesyenogranite, biotite-syenogranite and porfiritic-biotite-syenogranite. The magnetic suscetibility (MS) data allowed to identify three populations with differents magnetic characteristics, moderate to low MS values (< 3.53 x10-3 SIv) classify it as a moderately reduced granite. The Gradaús Granite shows contents of SiO2 >75%, MgO <0,2%, CaO <1%, FeOt between 1-2% and Al2O3 between 11,3 e 12,9%, metaluminous to peraluminous nature, 0.94 to 0.97 FeOt/(FeOt+MgO) ratios, K2O/Na2O ratios between 1 and 2 and higher LREE contents than HREE ((La/Yb)n=9.40). The LREE shows a moderate fractionation pattern ((La/Sm)n=4.61), while the HREE shows a subhorizontalized pattern ((Gd/Yb)n=1.40). The Eu anomalies are moderate to accentuated in the monzogranitic and syenogranitic rocks (Eu/Eu* 0.43-0.02), and slightly accentuated in the porfiritic ones (Eu/Eu* 0.25-0.03). It shows geochemical affinity to intraplate A-type granites, A2 subtype and ferroan granites. It shows petrografic, geochemical, geochronological and MS similarities to São João and Seringa granites, not yet placed in none of the three granitic suites of Carajás Province. The comparative study between these three granites to those which compreends the Jamon, Velho Guilherme and Serra dos Carajás granitic suites shows that these granites presente greater similarities to the granites that integrate the Serra dos Carajás Suite.