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PETROGRAPHY AND WHOLE-ROCK GEOCHEMISTRY OF VAUGNERITES FROM NW PORTUGAL (CENTRAL IBERIAN ZONE)

António Oliveira, Helena Brites, Fernando Noronha

First published: 2020-09-20https://doi.org/10.5593/sgem2020/1.1/s01.029View metrics

Abstract

In the portuguese section of the Central Iberian Zone, the Guimaraes region hosts a wide diversity of plutonic variscan lithologies including biotite-rich granitoids and vaugnerites. Vaugnerite outcrops occur as small bodies, typically enclosed by the main regional granite (the coarse-grained, biotite-rich, porphyritic Guimaraes and Santo Tirso monzogranite). Mafic enclaves of vaugnerites can also be identified in the host granite. The granitoids are peraluminous (ASI = 1.10 ? 1.15), having crystallized from melts generated at deep crustal levels, and they derived from the partial melting of metaigneous rocks and/or metagreywackes with some minor mantle contamination. On the other hand, the vaugnerites are metaluminous (ASI = 0.79 ? 0.85), they were generated from sources of higher temperature and with a more basic composition (i.e. mantle-derived), and their mineral assemblage presents biotite + plagioclase + orthopyroxene + clinopyroxene + hornblende ± allanite ± titanite ± zircon. Due to their low contents in K2O (3.50 ? 3.68 wt%), these mafic rocks should be considered redwitzites or K-poor vaugnerites. Both petrographic analysis and whole-rock geochemistry point to the lack of a genetic relationship between vaugnerites and granitoids of the Guimaraes region.

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Title
PETROGRAPHY AND WHOLE-ROCK GEOCHEMISTRY OF VAUGNERITES FROM NW PORTUGAL (CENTRAL IBERIAN ZONE)
Authors
António Oliveira, Helena Brites, Fernando Noronha
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 20th SGEM International Multidisciplinary Scientific GeoConference Proceedings 2020, Science and Technologies in Geology, Exploration And Mining
Publisher
STEF92 Technology
Year
2020
Pages
229-236
SWS Citekey
Oliveira20201229236
ISSN
1314-2704
ISBN
978-619-7603-04-0
Language
en
Publication type
Conference Paper
Keywords
VaugneritesGuimaraesVariscan OrogenyPetrographyWhole-rock geochemistry
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