Original paper

Mantle sources and differentiation of alkaline magmatic suite of Lages, Santa Catarina, Brazil

Traversa, Glanbosco; Barbieri, Mario; Beccaluva, Luigl; Coltorti, Massimo; Conte, Aida Maria; Garbarino, Carlo; Gomes, Celso B.; Macciotta, Glampaolo; Morbidelli, Lucio; Ronca, Sara; Scheibe, Luiz F.

European Journal of Mineralogy Volume 8 Number 1 (1996), p. 193 - 208

47 references

published: Feb 22, 1996
manuscript accepted: Oct 24, 1995
manuscript received: Feb 6, 1995

DOI: 10.1127/ejm/8/1/0193

BibTeX file

ArtNo. ESP147050801019, Price: 29.00 €

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Abstract

Abstract The alkaline-carbonatite district of Lages (Santa Catarina, Brazil) contains mafic-ultramafic and prevalent leucocratic bodies mainly composed of olivine melilitites, olivine nephelinites, basanites, phonotephrites, nepheline syenites and peralkaline phonolites. Kimberlitic pipe breccias and carbonatitic rocks are also present. Petrography, mineral and bulk-rock chemistry and mass balance calculations show that differentiated leucocratic rock-types can be derived by fractional crystallization processes from basanitic magmas. Trace element and Sr-Nd isotopic data suggest metasomatized mantle sources for the primary magmas and variable crustal contamination for the more differentiated rock-types.

Keywords

igneous petrologySr-Nd isotopesbasanite-peralkaline phonoliteBrazil