Abstract
The Campina Grande Granitic Complex comprises felsic facies with composition ranging from monzodiorite, granodiorite to quartz monzonite and mafic facies of dioritic composition. The presence of microgranular enclaves within the felsic rocks is interpreted as the products of mingling between coeval granitic and dioritic magmas. A U/Pb zircon age of 581 + 1.6 Ma was obtained from the felsic rocks. The Campina Grande Complex rocks show high-K calc-alkaline chemistry. The low contents of SiO 2 (45.66% – 54.48%) associated to high MgO (2.78% 4.40%) ad CaO (4.92% - 7.69%), high HFSE/LILE, ETRL/ETRP and 87 Sr/ 86 Sr ( 0.7069 – 0.7071) ratios and low values of ENd 600 (- 9.3 to -12.3) recorded in the diorites and gabbro suggest that their source was an enriched mantle. The mantle enrichment could be due to an incompatible-element rich component, remobilized from an oceanic crust during subduction. The chemistry and isotopic similarities between felsic and mafic facies suggest that they share similar source. The age of the complex suggest that it is associated to the evolution of the Serido Belt.
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