Geochemical characteristics and magmatic differentiation of phonolites and trachytic rocks from the České Středohoří Volcanic Complex, the Ohře Rift, Bohemian Massif

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F15%3A00000005" target="_blank" >RIV/00025798:_____/15:00000005 - isvavai.cz</a>
Result on the web
<a href="http://www.sciencedirect.com/science/journal/00244937" target="_blank" >http://www.sciencedirect.com/science/journal/00244937</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.lithos.2015.03.014" target="_blank" >10.1016/j.lithos.2015.03.014</a>

Result language
angličtina
Original language name
Geochemical characteristics and magmatic differentiation of phonolites and trachytic rocks from the České Středohoří Volcanic Complex, the Ohře Rift, Bohemian Massif
Original language description
Trachyandesites, trachytes and phonolites represent the most evolved rock types within the České Středohoří Volcanic Complex (CSVC) in the Ohře/Eger Rift. The K?Ar ages of the suite range from ~33.8 to ~25.8 Ma. Major and trace element variation in the series can be explained by several stages of modification of parental magmas by assimilation-fractional crystallization (AFC) involving fractionation of olivine, clinopyroxene, apatite, amphibole and Ti-oxide and bulk continental crust (BCC) as assimilate. Relative to basanitic starting compositions, trachytes are moderately depleted in Sr, exhibit pronounced depletions in P-Ti and some also show mild MREE depletion. Such composition requires variable amphibole, clinopyroxene, plagioclase ? apatite, titanite and/or Ti-magnetite fractionation and BCC assimilation. Two types of phonolites (type A and B phonolite) can be distinguished on the basis of overall REE patterns, Gd/Gd* ratios and Ba and Sr contents. Type B phonolites are depleted
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DD - Geochemistry
OECD FORD branch
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Project
<a href="/en/project/GAP210%2F12%2F1990" target="_blank" >GAP210/12/1990: Continental lithosphere as a source of differentiated alkaline lavas and genetic role of basic magmas constraints from volcanism of the Ohře Graben</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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