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Geochemistry of the Rio Espinharas hybrid complex, northeastern Brazil
Campos, T. F. C.; Neiva, A. M. R.; Nardi, L. V. S.The Rio Espinharas pluton, northeastern Brazil, belongs to the shoshonitic series and consists mainly of syenogranite, quartz-monzonite and porphyritic quartz-monzonite, but diorite, quartz-monzodiorite, quartz-syenite and microsyenogranite also occur containing microgranular enclaves, except for the diorite. Most variation diagrams of rocks, amphiboles, biotites and allanites show linear trends, but K, Zr, Sr ...
Geochemistry of Coexisting Biotite and Muscovite of Portuguese Peraluminous Gra...
Neiva, A. M. R.; Silva, M. M. V. G.; Gomes, M. E. P.; Campos, T. F. C.In nine Portugese peraluminous Hercynian granitic series of differentiation, Cr, V, Sc and Ba decrease, whereas Nb, Zn, Sn, Li, Rb and Cs increase in the sequence of micas crystallization. Commonly equilibrium was not attained for trace elements between coexisting primary biotite and muscovite. Correlations of Cr, V, Nb, Li, Rb and Cs were found for biotite-muscovite pairs. The same correlation has a different ...
Geochemistry of Coexisting Biotite and Muscovite of Portuguese Peraluminous Gra...
Neiva, A.M.R.; Silva, M.M.V.G.; Gomes, M.E.P.; Campos, T.F.C.
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