The pelitic paragneisses in the eastern part of the main body of the Jacareacanga Group comprise sillimanite-cordierite-garnet-biotite gneisses (samples FH-21 and FH-27), intercalated with amphibolite ...
The enrichment in LREE relative to the HREE of the dolerites studied associated with the ratios (Tb/Yb)N (1.95 - 2.56), Dy/Yb (2.33 - 2.85) characterizes a mantle source of lherzolite with garnet.
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