[1] Univ Fed Rio Grande do Norte, CCET, Postgrad Program Geodynam & Geophys, Dept Geol, BR-59072970 Natal, RN, Brazil
[2] Rural Fed Univ Semi Arid, Dept Environm Sci, BR-59625900 Mossoro, RN, Brazil
[3] Univ Fed Rio Grande do Norte, CCET, Dept Comp Sci & Appl Math, BR-59072970 Natal, RN, Brazil