Melanite-bearing nepheline syenite fragments and 40Ar/39Ar age of phlogopite megacrysts in conduit breccia from the Poços de Caldas Alkaline Massif (MG/SP), and implications

Melanite-bearing nepheline syenite fragments and 40Ar/39Ar age of phlogopite megacrysts in conduit breccia from the Poços de Caldas Alkaline Massif (MG/SP), and implications

ABSTRACT: The Poços de Caldas Alkaline Massif, located in southeast Brazil, is composed of tinguaites, as well as phonolites and nepheline syenites (NeS), together with assorted pyroclastic rocks. The latter constitute deposits within the Vale do Quartel, and show fragments of alkaline rocks (NeS, t...

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Bibliographic Details
Main Authors: Silvio Roberto Farias Vlach, Horstpeter Herberto Gustavo Jose Ulbrich, Mabel Norma Costas Ulbrich, Paulo Marcos Vasconcelos
Format: Article
Language:English
Published: Sociedade Brasileira de Geologia
Series:Brazilian Journal of Geology
Subjects:
Melanite-bearing nepheline syenite fragments
phlogopite megacrysts
conduit breccia
40 Ar/ 39 Ar age
Poços de Caldas Alkaline Massif
Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892018000200391&lng=en&tlng=en

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