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Zircon and whole-rock Zr/Hf ratios as markers of the evolution of granitic magmas: Examples from the Teplice caldera (Czech Republic/Germany)
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SYSNO ASEP 0477204 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Zircon and whole-rock Zr/Hf ratios as markers of the evolution of granitic magmas: Examples from the Teplice caldera (Czech Republic/Germany) Author(s) Breiter, Karel (GLU-S) RID, SAI, ORCID
Škoda, R. (CZ)Source Title Mineralogy and Petrology. - : Springer - ISSN 0930-0708
Roč. 111, č. 4 (2017), s. 435-457Number of pages 23 s. Publication form Print - P Language eng - English Country AT - Austria Keywords Zr/Hf value ; zircon ; Teplice caldera ; rhyolite ; rare-metal granite ; Cínovec deposit Subject RIV DB - Geology ; Mineralogy OECD category Mineralogy R&D Projects GA14-13600S GA ČR - Czech Science Foundation (CSF) Institutional support GLU-S - RVO:67985831 UT WOS 000407743900002 EID SCOPUS 85016437831 DOI 10.1007/s00710-017-0509-z Annotation Hafnium contents and Zr/Hf ratios were studied in zircons and their parent rocks from three magmatic suites associated with the Teplice caldera, Eastern Erzgebirge: rhyolite and dacite from the peraluminous Schönfeld Unit, relatively younger A-type Teplice rhyolite, and post-caldera A-type biotite and zinnwaldite granite and greisen. New data suggest that zircon crystallizing from a geochemically less evolved volatile- and water-poor melt is, compared to the host rock, relatively Hf-depleted, while zircon crystallizing from an evolved volatile- and water-rich melt has a Zr/Hf value approximately identical to that of the parental melt. Zr/Hf values in zircon did not change substantially either during greisenization, or during low-temperature alteration after metamictization. Zr/Hf values in the whole rock may serve as a sensitive indicator of magmatic fractionation of evolved granitic melts, as they are only negligibly influenced by the following hydrothermal processes. Zr/Hf values in individual cogenetic zircon grains are scattered but their general evolution trend in the rock series is consistent with the evolution of the whole-rock Zr/Hf values. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2018
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