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Idade pb-pb e assinatura isotópica rb-sr e sm-nd do magmatismo sienítico paleoproterozóico no Sul do cinturão móvel Salvador-Curaçá: maciço sienítico de São Félix, Bahia

2001; Sociedade Brasileira de Geologia; Volume: 31; Issue: 3 Linguagem: Inglês

10.5327/rbg.v31i3.954

2317-4889

Maria de Lourdes da Silva Rosa, Herbet Conceição, Moacir José Buenano Macambira, Thomaz Scheller, Hervé Martin, Luíz Rogério Bastos Leal,

Geochemistry and Geologic Mapping

The Sao Felix Syenitic Massif (MSSF) has a tabular shape with about 32 km 2 that represents the south expression of the aligned syenitic plutonism, which occur in the middle part of Salvador-Curaca mobile belt (CMSC). Single zircon dating by stepwise Pb evaporation methodology yields an age of 2098 ± 1 Ma to SFSM. This data correlate the emplacement of the SFSM with the late stages of SCMB stabilization. This massif is isotopically characterized by negative epsilon neodymium values (-1.45 to -2.89) and low initial strontium ratio (0.701 to 0.704). SFSM isotopic signature is similar to the ones displayed by the others syenites from the belt and reflects an enriched source which should be related to a metasomatic enriched mantle.