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- Title
Geochemistry of Neogene quartz andesites from the Oaş and Gutâi Mountains, Eastern Carpathians (Romania): a complex magma genesis.
- Authors
Jurje, Maria; Ionescu, Corina; Hoeck, Volker; Kovacs, Marinel
- Abstract
The Neogene quartz andesites from the Oaş and Gutâi Mountains (Romania) are mid-K calc-alkaline rocks and contain plagioclase-orthopyroxene-clinopyroxene-amphibole-magnetite phenocrysts as well as quartz crystals. They are associated with a volcanic sequence ranging from basalts and basaltic andesites to dacites and rhyolites, but form a separate magma group, mostly in respect to the trace elements. Based on the geochemical data combined with inferences from complex zoning patterns in plagioclase and pyroxene, the evolution of quartz andesites is interpreted in terms of fractional crystallization, AFC and magma mixing. A parental magma deriving from a MORB- or OIB-type source modified by fluids and melts originating from sediments is envisaged.
- Subjects
ROMANIA; GEOCHEMISTRY; NEOGENE Period; DACITE; MAGMAS; PHENOCRYSTS
- Publication
Mineralogy & Petrology, 2014, Vol 108, Issue 1, p13
- ISSN
0930-0708
- Publication type
Article
- DOI
10.1007/s00710-013-0282-6