Počet záznamů: 1

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

SYSNO ASEP	0459103
Druh ASEP	J - Článek v odborném periodiku
Zařazení RIV	J - Článek v odborném periodiku
Poddruh J	Článek ve WOS
Název	Petrogenesis of Miocene alkaline volcanic suites from western Bohemia. Whole rock geochemistry and Sr-Nd-Pb isotopic signatures.
Tvůrce(i)	Ulrych, Jaromír (GLU-S)_{RID, SAI} Krmíček, Lukáš (GLU-S)_{RID, ORCID, SAI} Tomek, Č. (SK) Lloyd, F. E. (GB) Ladenberger, A. (SE) Ackerman, Lukáš (GLU-S)_{RID, SAI, ORCID} Balogh, K. (HU)
Zdroj.dok.	Chemie der Erde-Geochemistry. - : Elsevier - ISSN 0009-2819 Roč. 76, č. 1 (2016), s. 77-93
Poč.str.	17 s.
Forma vydání	Online - E
Jazyk dok.	eng - angličtina
Země vyd.	DE - Německo
Klíč. slova	Bohemian Massif ; Cenozoic alkaline volcanism ; Geochemistry ; K-Ar ages ; Sr-Nd-Pb isotopes
Vědní obor RIV	DD - Geochemie
Institucionální podpora	GLU-S - RVO:67985831
UT WOS	000376216500006
EID SCOPUS	84949034787
DOI	10.1016/j.chemer.2015.11.003
Anotace	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.
Pracoviště	Geologický ústav
Kontakt	Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272
Rok sběru	2017

Počet záznamů: 1