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Stable isotope relations in an open magma system, Laacher See, Eifel (FRG)

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Abstract

18O/16O and D/H ratios have been measured for matrix glasses and phenocrysts from the zoned phonolitic Laacher See tephra sequence (11000 y.b.p., East Eifel volcanic field, FRG) to study open-system behaviour of the associated magma system. Mineral and glass δ 18O values appear to be largely undisturbed by low-temperature, secondary alteration, record isotopic equilibrium and confirm previous conclusions, based on radiogenic isotope evidence, of early, small-scale crustal assimilation during differentiation of parental magmas in a crustal magma chamber. One sanidine-glass pair possibly documents the late stage influx of meteoric fluids into the topmost magma layer prior to eruption. A sealing carapace of chilled magma, which itself was strongly contaminated, prevented large-scale fluid exchange up to the point prior to eruption when this carapace was fractured and meteoric water gained access to parts of the magma system. D/H measurements of various glass types (glass inclusions, dense and pumiceous glass) and amphiboles gave conflicting results suggesting a combination of degassing, volatile exchange with country rocks and hydration. Stable isotope ratios for primitive parental magmas (δ 18O=+5.5 to 7.0‰) and mantle megacrysts (δ 18O=+ 5.5 to +6.0‰, δD=−21 to −38‰, for amphiboles and phlogopite, resp.) suggest a rather variable fluid composition for the sub-Eifel mantle.

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Authors and Affiliations

  1. Institut f. Mineralogie, Ruhr Universität, Postfach 102148, D-4630, Bochum, Federal Republic of Germany

    G. Wörner

  2. Department of Geological Sciences, Southern Methodist University, 75275, Dallas, TX, USA

    R. S. Harmon

  3. Geochemisches Institut, Universität Göttingen, Goldschmidtstr. 1, D-3400, Göttingen, Federal Republic of Germany

    R. S. Harmon & J. Hoefs

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  1. G. Wörner
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  2. R. S. Harmon
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  3. J. Hoefs
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Wörner, G., Harmon, R.S. & Hoefs, J. Stable isotope relations in an open magma system, Laacher See, Eifel (FRG). Contr. Mineral. and Petrol. 95, 343–349 (1987). https://doi.org/10.1007/BF00371848

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