Abstract
The greenstone belts of Crixas and Hidrolina of Goias, Brazil, are dismembered components of the same body or of originally adjacent belts. Their tectono-metamorphic history and stratigraphy is similar, as well as their igneous components (meta-komatiites, meta-basalts and felsic meta-volcanics). Chemically, they differ for the CaO and Al2O3 versus MgO trends and for the behaviour of many incompatible and compatible trace elements (Cr, Ni, Ti, Sc, Y, Zr, P). The difference in the Ca and Al behaviour, wich is anomalous at Crixas, is tentatively attributed to an unconstrained igneous crystallization process. This process should imply the growth of clinopyroxene into an olivine-dominated crystal mush, and has acted at Crixas and not at Hidrolina. The difference in the trace element behaviour has been mainly attributed to a compositional and modal heterogeneity of the mantle source, which was probably spinel-richer at Crixas than at Hidrolina.
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