Luciane Silva Moreira, Universidade Federal Fluminense, geochemistry, Niteroi, Brazil, Patricia F Moreira-Turcq, IRD UFF, Bondy, France, Keila Aniceto, Universidade Federal do Amazonas, Manaus, Brazil, Renato Campello Cordeiro, Federal Fluminese University, Niteroi, Brazil and Bruno Turcq, IRD, Bondy, France