2021
DOI: 10.5802/crgeos.100
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Petrogenetic constraints on the felsic vein magmatism in northern Portugal based on petrological and geochemical data

Abstract: Three of the largest granite porphyries of northern Portugal were studied to improve current knowledge on the regional felsic vein hypabyssal magmatism. All porphyries exhibit microcrystalline groundmasses of variable granularity (composed of quartz, K-feldspar, and muscovite), quartz, K-feldspar, plagioclase, biotite, and cordierite phenocrysts, antirapakivi and rapakivi feldspars, embayments in quartz, and enrichments in rare metal incompatible elements. The veins were emplaced along fractures generated duri… Show more

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Cited by 2 publications
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“…Sometimes, the regular growth zoning can be interrupted by textural discontinuities along which the original pattern is resorbed and succeeded by the deposition of new-growth zoned zircon. Mainly in CG, there are zircon crystals that were most probably incorporated from host Variscan granites during transit and emplacement, and, therefore, they are termed as xenocrysts [100]. These xenocrysts share many of the features described for those with inherited zircon cores.…”
Section: Zircon Morphology and Structurementioning
confidence: 99%
“…Sometimes, the regular growth zoning can be interrupted by textural discontinuities along which the original pattern is resorbed and succeeded by the deposition of new-growth zoned zircon. Mainly in CG, there are zircon crystals that were most probably incorporated from host Variscan granites during transit and emplacement, and, therefore, they are termed as xenocrysts [100]. These xenocrysts share many of the features described for those with inherited zircon cores.…”
Section: Zircon Morphology and Structurementioning
confidence: 99%