Magmatismos shoshonítico e cálcio-alcalino de alto potássio pós-orogênico (615 Ma) na porção leste do domínio Macururé, sistema orogênico sergipano : stocks Propriá, Amparo do São Francisco e Fazenda Alvorada

Abstract

The Propriá, Amparo do São Francisco and Fazenda Alvorada stocks are intrusive in the eastern part of the Macururé Domain and cut the regional orientation. These stocks present similar geological and petrographic features and are essentially constituted by quartz monzonites and porphyritic granites. In these plutons biotite is the predominant mafic mineral and hornblende occurs in some enclaves. Plagioclase crystals exhibit path zoning indicating important instabilities during crystallization. The accessory minerals in these rocks are apatite, zircon, titanite, opaque minerals. In the Propriá and Amparo do São Francisco the stocks the microgranular mafic enclaves are abundant. The crystallization age of the Propriá stock is 615 ± 6 Ma (U-PbSHRIMP). The geochemical data indicate that these stocks correspond to magmatism potassium, orogenic and arc signature and positioned in a post-collision set.