Petrogenesis of Mafic to Felsic Lavas from the Oligocene Siebengebirge Volcanic Field (Germany): Implications for the Origin of Intracontinental Volcanism in Central Europe

Source components and magmatic processes in the genesis of Miocene to Quaternary lavas in western Turkey: constraints from HSE distribution and Hf–Pb–Os isotopes

“…HSE variations and Hf-Pb-Os isotope systematic are presented for the Miocene to Quaternary lava suites of western A n a to li a n m a n tl e li th o s p h e re Also shown for comparison are the compositional fields for the Eocene tholeiitic lavas from NW Anatolia, the Early to Middle Miocene lavas from the entire west Anatolia (Chakrabarti et al 2012), the lavas of the south Aegean arc (Bailey et al 2009) and the Cenozoic intraplate lavas from the Central European Volcanic Province (CEVP; Blusztajn and Hegner 2002;Jung et al 2011;Kolb et al 2012), and the central Mediterranean (Gasperini et al 2002;Viccaro et al 2011). "C" and "WAM" mantle components are as described in Figs.…”

“…In particular, as shown in Figs. 6, 9, and 10, the OIB-type lavas from western Turkey display strong similarities in Hf-Nd-Pb-Os isotopic systematics with the Miocene rift-related alkaline lavas of the central European volcanic province (Blusztajn and Hegner 2002;Jung et al 2011;Kolb et al 2012), as well as parts of the central Mediterranean Cenozoic igneous province (Gasperini et al 2002;Viccaro et al 2011), where the eruption of OIBtype intraplate basalts is interpreted to be associated with large-scale lithospheric extension. 207 Pb/ 204 Pb-206 Pb/ 204 Pb relationships of the intraplate lavas from this entire region are consistent with involvement of an enriched component (Fig.…”

“…Solid lines represent the isotopic evolution of modeled MORB crust of varying ages generated from the depleted MORB mantle using the average present-day Lu/Hf and Sm/Nd values for E-MORB and N-MORB (Chauvel and Blichert-Toft 2001;Chauvel et al 2008;Geldmacher et al 2011), while the dashed lines represent the mixture of N-MORB crust with associated sediments of similar age (Chauvel et al 2008). Shown for comparison are the compositional fields for the Cenozoic intraplate lavas from the Central European Volcanic Province (CEVP; Jung et al 2011;Kolb et al 2012) and the central Mediterranean (Gasperini et al 2002;Viccaro et al 2011) one of the slab-derived components. Thus, combined evaluation of the Hf, Pb, and Os isotope data is consistent with melt derivation from a source mantle with overprint by a sediment-derived subduction component.…”

Petrogenesis of alkaline basalt-hosted sapphire megacrysts. Petrological and geochemical investigations of in situ sapphire occurrences from the Siebengebirge Volcanic Field, Germany

“…The volcanic activity in the Siebengebirge occurred over several eruptional phases, resulting in the eruption of a very broad spectrum of both SiO 2 saturated and SiO 2 undersaturated mafic and felsic melts. The most primitive mafic volcanics are basanites to alkali basalts; more felsic volcanics are SiO 2 saturated latites to trachytes and SiO 2 undersaturated phonotephrites to tephriphonolites (Vieten et al 1988;Kolb et al 2012;Jung et al 2012). The period of volcanic activity in the SVF has been dated using the K/Ar and Ar/Ar chronometers and lasted from 30 to 19 Ma (Todt and Lippolt 1980;Linthout et al 2009;Przybyla 2013).…”

Role of crustal assimilation and basement compositions in the petrogenesis of differentiated intraplate volcanic rocks: a case study from the Siebengebirge Volcanic Field, Germany

“…Kolb et al 2012), which is remarkable considering the relatively small regional extension of the SVF. This feature of the SVF is striking, because the basanites should follow the entire high alkali differentiation trend and evolve to phonolitic end-members.…”