Idades SHRIMP U-Pb do Complexo Sertânia: implicações sobre a evolução tectônica da Zona Transversal, Província Borborema

Abstract

The Sertânia complex in the Alto Moxotó Terrane, Zona Transversal of the Borborema Province, Northeast Brazil, is a metasedimentary sequence with a subordinate metavolcanic component, metamorphosed under upper amphibolite facies conditions. Several previous regional geological surveys have included this rock assemblage in an undivided gneissic-migmatitic complex, due to the lack of a tectonostratigraphic model for this unit. This paper presents the first geochronological zircon U-Pb ages (SHRIMP U-Pb ages) and the first Sm-Nd isotopic data for this complex. Field and microscopic research reveals the existence of a volcanoclastic fraction of andesitic and dacitic composition, besides the dominant clastic components in these supracrustals. Furthermore, cathodoluminescence images of zircons show well formed little rounded crystals, thus suggesting reduced sediment transport prior to deposition. The calculated ages means with a 95% confidence level, based on a group of zircons of the same generation plot around 2.0 Ga, representing the episode of primary zircon crystallization. Some observed overgrowths testify to an additional Brasiliano overprint (ca. 0.6 Ga). Geochronological data on the supposed meta-plutonic rocks of the same complex point to the same Paleoproterozoic time interval, thus indicating contemporaneity with the sedimentation of the supracrustals. The obtained Nd model ages and µNd(t) parameters also confirm a contribution of Archean and Paleoproterozoic sources to these supracrustals rocks. These data clearly demonstrate contrast between the supracrustal rock assemblages of the Alto Moxotó Terrane and the supracrustals of other terranes of the Zona Transversal, which display Meso to Neoproterozoic ages, and imply that this crustal segment represents an independent lithotectonic domain.