The Neoproterozoic Ceara Group, Ceara Central domain, NE Brazil: Depositional age and provenance of detrital material. New insights from U-Pb and Sm-Nd geochronology

From the Archean to the end of the Neoproterozoic the Borborema Province, northeast Brazil went through a complex polycyclic geologic evolution, ending, between 660 and 570 Ma, with the Brasiliano/Pan-African orogeny that led to West Gondwana amalgamation. Evolution of the metasedimentary covers of the Province, from the beginning of their deposition up to their involvement in the Brasiliano/ Pan-African collision, is a key element in understanding formation of Gondwana and in attempts in predrift correlation between South America and West Africa. One of these covers, the Ceara Group, is exposed in the Ceara Central domain. Aiming to unravel the history of the Ceara Group, we carried out a geochronologic study of representative samples, combining Sm-Nd isotopic data, conventional U-Pb TIMS dating of zircon and U-Pb SHRIMP age determination of detrital zircon grains. Our results show that sedimentation of the Ceara Group started around 750 Ma, following rifting of the Archean/Paleoproterozoic basement, associated with bimodal volcanism. The interlayered basic volcanic rocks, recrystallized into garnet amphibolites, show a concordant age of 749 +/- 5 Ma interpreted as the age of crystallization. About 90% of calculated Sm Nd TDM model ages of metasedimentary rocks are Paleoproterozoic and more than 50% of the analyzed samples have TDM between 1.95 and 2.4 Ma, with strongly negative epsilon Nd, consistent with provenance mainly from the Paleoproterozoic basement. Strong contrast between Paleoproterozoic TDM with negative epsilon Nd and young TDM (Mesoproterozoic) with slightly positive epsilon Nd is interpreted as a consequence of changes in detritus provenance induced by geomorphologic alterations resulting from tectonic activity during rifting. Ages of detrital zircon grains obtained by SHRIMP U-Pb analyses show three main groups: about 1800 Ma, 1000-1100 Ma and ca. 800 Ma which corresponds to the bimodal magmatism associated, respectively to the Oros-Jaguaribe domain, Cariris Velhos event and Independencia Group. (C) 2014 Elsevier Ltd. All rights reserved.