Shoshonitic and calc-alcaline high potassic post-orogenic (615 Ma) magmatism in the eastern part of Macururé Domain, Sergipan Orogenic System: Propriá, Amparo do São Francisco and Fazenda Alvorada Stocks
DOI:
https://doi.org/10.11606/issn.2316-9095.v19-141362Keywords:
Granites, U-Pb Age, Petrography, GeochemistryAbstract
The Propriá, Amparo do São Francisco and Fazenda Alvorada Stocks are intrusive in the eastern part of the Macururé Domain and cross-cut the regional trend. These stocks present similar geological and petrographic features and are 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 patchy 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 stocks, the microgranular mafic enclaves are abundant. The crystallization age of the Propriá Stock is 615 ± 6 Ma (U-PbShrimp). Geochemical data indicate that these stocks represent potassic magmas, generated in an orogenic environment and later intrusive in the post-collision period.
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