Petrogenesis of Miocene alkaline volcanic suites from western Bohemia. Whole rock geochemistry and Sr-Nd-Pb isotopic signatures.

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F16%3A00459103" target="_blank" >RIV/67985831:_____/16:00459103 - isvavai.cz</a>

Alternative codes found

RIV/00216305:26110/16:PU118961

Result on the web

<a href="http://dx.doi.org/10.1016/j.chemer.2015.11.003" target="_blank" >http://dx.doi.org/10.1016/j.chemer.2015.11.003</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.chemer.2015.11.003" target="_blank" >10.1016/j.chemer.2015.11.003</a>

Result language

angličtina

Original language name

Petrogenesis of Miocene alkaline volcanic suites from western Bohemia. Whole rock geochemistry and Sr-Nd-Pb isotopic signatures.

Original language description

The Mid to Late Miocene intraplate alkaline volcanic suites of western Bohemia are relict of the intensive voluminous volcanism accompanied by large-scale uplift and doming. The association with the uplift of the NE flank of the Cheb–Domažlice Graben (CDG) is uncertain in view of the mostly transpressional tectonics of the graben. The volcanism is most probably of the Ohře/Eger Rift off-rift settings. Two cogenetic volcanic suites have been recognised: (i) silica-saturated to oversaturated consisting of olivine basalt – trachybasalt – (basaltic) trachyandesite – trachyte – rhyolite (13.5 to 10.2 Ma) and (ii) silica-undersaturated (significantly Ne-normative) (melilite-bearing) olivine nephelinite – basanite – tephrite (18.3 to 6.25 Ma). A common mantle source is assumed for the near-primary mantle-derived compositions of both suites, i.e., olivine basalt and olivine nephelinite. Apparently, they were generated by different degrees of partial melting of a common mantle source, with garnet, olivine and clinopyroxene in the residuum. Negative Rb and K anomalies indicate a residual K-phase (amphibole/phlogopite) and melting of partly metasomatised mantle lithosphere. The evolution of the olivine basalt – trachybasalt – (basaltic) trachyandesite – trachyte – rhyolite suite suggests the presence of an assimilation–fractional crystallization process (AFC). The magmas were probably sourced by both sub-lithospheric and lithospheric partly metasomatised mantle. The evolution of the (melilite-bearing) olivine nephelinite – basanite – tephrite suite is less clear because of its limited extent. The Sr-Nd-Pb isotopic composition of primitive volcanic rocks of both suites is similar to that of the European Asthenospheric Reservoir (EAR). Initial Pb isotopic data plot partly above the northern hemisphere reference line at radiogenic 206Pb/204Pb ratios of 19 to 20, and indicate the presence of a Variscan crustal component in the source.

Czech name

—

Czech description

—

Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

DD - Geochemistry

OECD FORD branch

—

Project

<a href="/en/project/LO1408" target="_blank" >LO1408: AdMaS UP – Advanced Building Materials, Structures and Technologies</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Chemie der Erde-Geochemistry

ISSN

0009-2819

e-ISSN

—

Volume of the periodical

76

Issue of the periodical within the volume

1

Country of publishing house

DE - GERMANY

Number of pages

17

Pages from-to

77-93

UT code for WoS article

000376216500006

EID of the result in the Scopus database

2-s2.0-84949034787