Sr, Nd, and Pb isotope geochemistry of Tertiary and Quaternary alkaline volcanics from West Germany

Wörner, Gerhard; Zindler, Alan; Staudigel, Hubert; Schmincke, H.-U.

doi:10.1016/0012-821x(86)90044-0

Cited by 152 publications

(51 citation statements)

References 31 publications

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“…Data for phonolites from Wedepohl et al (1994) are also shown. The tephrites, phonotephrites, phonolites, trachytes and the tephriphonolite from this study plot in the ´depleted field´ relative to Bulk Earth in the Sr-Nd isotope diagram similar to other alkaline rocks from central Europe (Wörner et al, 1986;Wilson and Downes, 1991;Wedepohl et al, 1994;Jung and Masberg, 1998;Jung and Hoernes, 2000;Bogaard and Wörner, 2003;Haase et al, 2004;Jung et al, 2006) but slightly below the inferred parental mafic melts. Figure 7 ‰ which is essentially the same range as observed in the more primitive alkaline rocks.…”

Section: Sr Nd Pb and O Isotopesmentioning

confidence: 99%

Petrogenesis of rift-related tephrites, phonolites and trachytes (Central European Volcanic Province, Rhön, FRG): Constraints from Sr, Nd, Pb and O isotopes

Jung¹,

Mezger²,

Hauff³

et al. 2013

Chemical Geology

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Section: Sr Nd Pb and O Isotopesmentioning

confidence: 99%

Petrogenesis of rift-related tephrites, phonolites and trachytes (Central European Volcanic Province, Rhön, FRG): Constraints from Sr, Nd, Pb and O isotopes

Jung¹,

Mezger²,

Hauff³

et al. 2013

Chemical Geology

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“…Volcanism commenced in the Early Miocene (~ 22-23 Ma), however, the main phase of activity began ~ 18 Myr ago and peaked between 16 and 17 Ma. The Rhön and Northern Hessian Depression volcanic fields are closely related, both spatially and temporally, to the Vogelsberg and erupted a similar range of magma types (Wedepohl et al, 1994;Jung & Hoernes, 2000).In the East and West Eifel volcanic fields about 300, typically small-volume, eruptions occurred from monogenetic centres between 700,000 and 10,800 BP (Schmincke et al, 1983;Wörner et al, 1986), associated with about 250 m of uplift. The volume of magma erupted is quite small (about 15 km 3 ), but the actual volume of magma generated at mantle depths must have been significantly greater (70-100 km 3 ; G. Wörner, personal communication, 2004).…”

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confidence: 89%

“…In the East and West Eifel volcanic fields about 300, typically small-volume, eruptions occurred from monogenetic centres between 700,000 and 10,800 BP (Schmincke et al, 1983;Wörner et al, 1986), associated with about 250 m of uplift. The volume of magma erupted is quite small (about 15 km 3 ), but the actual volume of magma generated at mantle depths must have been significantly greater (70-100 km 3 ; G. Wörner, personal communication, 2004).…”

Section: Rhenish Massifmentioning

confidence: 99%

Tertiary-Quaternary intra-plate magmatism in Europe and its relationship to mantle dynamics

Wilson

Downes

2006

Memoirs

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Anorogenic intra-plate magmatism was widespread in Europe from early Tertiary to Recent times, extending west to east from Spain to Bulgaria, and south to north from Sicily to northern Germany. Magmatism is spatially and temporally associated with Alpine-Pyrenean collisional tectonics, the development of an extensive lithospheric rift system in the northern foreland of the Alps, and, locally, with uplift of Variscan basement massifs (Massif Central, Rhenish Massif, Bohemian Massif). The volcanic regions vary in volume from large central volcanoes (e.g. Cantal, Massif Central;Vogelsberg, northern Germany), to small isolated plugs (e.g. Urach and Hegau provinces in southern Germany). Within the Mediterranean region, the Dinarides, the Pannonian Basin and Bulgaria, anorogenic volcanism locally postdates an earlier phase of subduction-related magmatism.The major and trace element and Sr-Nd-Pb isotope characteristics of the most primitive mafic magmatic rocks (MgO > 6 wt %) provide important constraints on the nature of the mantle source and the conditions of partial melting.. These are predominantly sodic (melilitites, nephelinites, basanites and alkali olivine basalts); however, locally, potassic magma types (olivine leucitites, leucite nephelinites) also occur. In several localities (e.g., Sicily; Vogelsberg and the Rhine Graben, Germany; Calatrava, central Spain) olivine-and quartz-tholeiites form a significant component of the magmatism. The sodic magmas were derived by variable degrees of partial melting (~ 0.5 -5 %) within a transitional zone between garnet-peridotite and spinel-peridotite mantle facies, close to the base of the lithosphere; the potassic magma types are interpreted as partial melts of enriched domains within the lithospheric mantle. Mantle partial melting was induced by adiabatic decompression of the asthenosphere, locally in small-scale, plume-like, diapirs which appear to upwell from ~ 400 km depth. 2Tertiary and Quaternary volcanic activity within Europe occurs in two principal geotectonic settings: referred to as orogenic and anorogenic by Wilson & Bianchini (1999). Occurrences of calc-alkaline volcanism (orogenic) in the Alpine chain, the Carpathians and the Mediterranean region (Harangi et al., this volume) can be explained geodynamically in terms of contemporaneous subduction, and will not be considered further in this review. Here emphasis is placed on the extensive anorogenic, dominantly alkaline, volcanic province to the north of the Alpine collision zone, including the Massif Central of France, the Rhenish Massif of northern Germany, the Rhine Graben, and the Eger Graben within the northern part of the Bohemian Massif in the Czech Republic (Figs. 1 & 2). Further to the east mafic alkaline volcanism (anorogenic) post-dates a major phase of subduction-related volcanism in the Pannonian Basin, the Dinarides (Serbia, Slovenia, Croatia, N. Bosnia), Bulgaria and western Turkey. Further south,within the Mediterranean region, anorogenic volcanism occurs in Sicily, Sardinia, Monte V...

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“…The isotope signatures of Cenozoic volcanics in Europe suggest the presence of subducted material in the European subcontinental mantle (Worner et al, 1986;Wilson and Downes, 1991), and the peridotite xenoliths from these regions had gone through a variety of metasomatic events (e.g. Stoch and Seck, 1980;Witt-Eickschen et al, 1993;Witt-Eickschen et al, 2003).…”

Section: Eifel: Du24 Du 25 Du26 Mm2 and Mm13mentioning

confidence: 99%

Nitrogen in peridotite xenoliths: Lithophile behavior and magmatic isotope fractionation

Yokochi

Marty

Chazot

et al. 2009

Geochimica et Cosmochimica Acta

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International audienceIn order to document the origin and speciation of nitrogen in mantle-derived rocks and minerals, the N and Ar contents and isotopic compositions were investigated for hydrous and anhydrous peridotite xenoliths from Ataq, Yemen, from Eifel, Germany, and from Massif Central, France. Nitrogen and Ar were extracted by stepwise combustion with a fine temperature resolution, followed by fusion in a platinum crucible. A large isotopic disequilibrium of up to 25.4‰ is observed within single peridotite xenoliths, with δ15N values as low as −17.3‰ in phlogopite whereas clinopyroxene and olivine show positive δ15N values. Identical Sr isotopic ratios of phlogopite, clinopyroxene and whole rock in this wehrlite sample are consistent with crystallization from a common reservoir, suggesting that the light N signature of phlogopite might be the result of isotopic fractionation during N uptake from the host magma. The nitrogen concentration is systematically high in phlogopite, (7.6–25.7 ppm), whereas that of bulk peridotite xenoliths is between 0.1 and 0.8 ppm. The high N content of phlogopite is at least partly due to host magma–mineral interaction, and may also suggest the occurrence of N as View the MathML source that substituted for K+ during mineral growth in mafic magmas. Such speciation is consistent with the fact that N and Rb contents correlate well for a set of samples from mantle regions that were affected by subduction-related metasomatism and magmatism. The N/Rb ratios of these samples are comparable with values estimated for subduction zone magmas, but are one order of magnitude lower than the N/Rb ratios characterizing subducting slabs. This difference suggests preferential release of N relative to alkalis in the forearc region. N/40Ar* ratios of minerals from analyzed mantle xenoliths are much higher than those of vesicles in MORBs and OIBs, requiring either the occurrence of nitrogen speciation in the mantle more compatible than Ar, significant loss of fluid phase during entrainment, or long residence time of volatile elements in the mantle source(s) of fluids to increase drastically the 40Ar* budget of the latter

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Sr, Nd, and Pb isotope geochemistry of Tertiary and Quaternary alkaline volcanics from West Germany

Cited by 152 publications

References 31 publications

Petrogenesis of rift-related tephrites, phonolites and trachytes (Central European Volcanic Province, Rhön, FRG): Constraints from Sr, Nd, Pb and O isotopes

Petrogenesis of rift-related tephrites, phonolites and trachytes (Central European Volcanic Province, Rhön, FRG): Constraints from Sr, Nd, Pb and O isotopes

Tertiary-Quaternary intra-plate magmatism in Europe and its relationship to mantle dynamics

Nitrogen in peridotite xenoliths: Lithophile behavior and magmatic isotope fractionation

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