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Lamprophyres occur as microgranular enclaves in the Gloria Norte Monzonitic Stock (588 ± 5 Ma), located in the central part of the Macurure Domain, Sergipano Orogenic System, in the state of Sergipe, Brazil. These lamprophric enclaves were classified as minettes and occur concentrated in an area of approximately 1 km in diameter in the southeast region of the stock. The minettes have porphyritic, panidiomorphic textures with biotite phenocrystals, and fine granulation matrix. The mafic minerals present, in addition to the biotite, are diopside, augite, hornblende and titanite. Perthitic orthoclase, andesine, biotite, carbonate, apatite and zircon are also present in the matrix. The data of the major (K 2 O/Na 2 O >3, 6 > %MgO > 8, K 2 O > 3%), minor and traces elements (low values of Ti, Nb, Ta) indicate orogenic ultrapotassic magmatism. The ratio Th/Yb > 9.00 and 0.05 < Ta/Yb < 0.20 points to magma formed by melting of an enriched mantle. The information obtained in this study indicates that ultrapotassic basic magmas were present during the post-tectonic period in the Sergipano Orogenic System (SOS).

geologia usp. série científica

Minettes do Stock Monzonítico Glória Norte: evidência de magmatismo ultrapotássico pós-orogênico, com assinatura de subducção, no Sistema Orogênico Sergipano