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Carbon isotope fluctuations in Precambrian carbonate sequences of several local...
Sial, Alcides N.; Ferreira, Valderez P.; Almeida, Afonso R. de; Romano, Antonio W.; Parente, Clóvis Vaz; Costa, Marcondes L. da; Santos, Victor H.Carbon isotope fluctuations in Precambrian sedimentary carbonates between 2.8 Ga and 0.60 Ga in Brazil are examined in this study. The carbonate facies of the BIF of the 2.8 Ga-old Carajás Formation, state of Pará in northern Brazil, has rather homogeneous delta13C (-5 o/ooPDB), compatible with carbonatization of a silicate protolith by a CO2-rich fluid from mantle degassing. The Paleoproterozoic Gandarela Form...
Date: 2022
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Origin: Oasisbr