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Geochemistry of Neogene quartz andesites from the Oaş and Gutâi Mountains, Eastern Carpathians (Romania): a complex magma genesis

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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.

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Acknowledgments

Critical comments by Dr. C. Szabo and an anonymous reviewer significantly helped to improve the paper. Dr. M. Maggetti and Dr. C. Tomek are thanked for the fruitful discussions and important suggestions and Mrs. Monica Mereu for the computer-assisted drawings, respectively. The financial support provided to M.J. through the “Human resources development” program, Contract POSDRU 6/1.5/S/3 “Doctoral studies: through science towards society” is gratefully acknowledged. C.I. and V.H benefited of CEEPUS (Central European Exchange Program for University Studies) scholarships and analytical facilities.

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Authors and Affiliations

  1. Mineralogical Museum, 8 Traian Blvd, 430212, Baia Mare, Romania

    Maria Jurje

  2. Department of Geology, Babeş-Bolyai University, 1 Kogălniceanu Str, 400084, Cluj-Napoca, Romania

    Maria Jurje, Corina Ionescu & Volker Hoeck

  3. Department Geography and Geology, Paris Lodron University, 34 Hellbrunner Str, 5020, Salzburg, Austria

    Volker Hoeck

  4. Technical University Cluj-Napoca, North University Centre Baia Mare, 62 Dr. Victor Babeş Str, 430083, Baia Mare, Romania

    Marinel Kovacs

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  1. Maria Jurje
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  2. Corina Ionescu
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  3. Volker Hoeck
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  4. Marinel Kovacs
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Corresponding author

Correspondence to Corina Ionescu.

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Editorial handling: J. G. Raith

*** GERM Partition Coefficient (Kd) Database. http://earthref.org/KDD/, accessed on 22 Sept 2012

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Jurje, M., Ionescu, C., Hoeck, V. et al. Geochemistry of Neogene quartz andesites from the Oaş and Gutâi Mountains, Eastern Carpathians (Romania): a complex magma genesis. Miner Petrol 108, 13–32 (2014). https://doi.org/10.1007/s00710-013-0282-6

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