Abstract
Unweathered granites free of hydrothermal alteration from the Goias Tin Province show alkaline granite rare earth element (REE) patterns (more than 100 X chondrite), while greisenized granite and muscovite-enriched granite are poor in REE and have depleted light REE patterns with negative Eu anomalies. Greisen in the province have seagull type REE patterns (La/Yb)N ≅ 1, with strong negative europium anomalies and fractionated heavy REE patterns. A completely different REE pattern (only 4 X chondrite, with Eu anomaly) in the tourmaline-bearing granite is striking. The REE patterns of the tin-bearing Serra Branca greisen and Pela Ema/Serra Dourada sodium-rich gneiss support the idea that these rocks were generated by metasomatism of granitic rocks related to the massifs. The REE data reported on samples coming from the Sao Domingos granite and granodiorite support the possibility that these rocks can be derived from a single parental magma.
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