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The phosphatic soils found in the northern part of the Rata island, in the Fernando de Noronha Archipelago, were formed by reaction of bird guano with weathered mafi c rocks of the Quixaba Formation. Phosphate minerals identifi ed include crandallite as a major constituent. The unique guano signature preserved in soil is characterized by high levels of Cu, Pb, Zn, As, U, and Sr. On the other hand, the inheritance of the geochemical signature of the nepheline-basalts is demonstrated by the anomalous concentrations of Ba, Nb, Ta, Cr, Hf, V and Zr in soils, and by the remarkable similarity between REE patterns in rock and soils.

Evidência geoquímica de solos formados pela interação de guanos com rochas vulcânicas, Ilha Rata, Fernando de Noronha (PE)