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Title: PETROGRAPHY AND WHOLE-ROCK GEOCHEMISTRY OF VAUGNERITES FROM NW PORTUGAL (CENTRAL IBERIAN ZONE)
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PETROGRAPHY AND WHOLE-ROCK GEOCHEMISTRY OF VAUGNERITES FROM NW PORTUGAL (CENTRAL IBERIAN ZONE)
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1314-2704
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English
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20
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1.1
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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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conference
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20th International Multidisciplinary Scientific GeoConference SGEM 2020
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20th International Multidisciplinary Scientific GeoConference SGEM 2020, 18 - 24 August, 2020
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Proceedings Paper
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STEF92 Technology
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International Multidisciplinary Scientific GeoConference-SGEM
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SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts & Letters; Acad Fine Arts Zagreb Croatia; C
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229-236
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18 - 24 August, 2020
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website
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cdrom
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6839
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Vaugnerites; Guimaraes; Variscan Orogeny; Petrography; Whole-rock geochemistry
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