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Magmatic Differentiation in the Teide–Pico Viejo Succession: Isotope Analysis as a Key to Deciphering the Origin of Phonolite Magma
Department of Earth and Environmental Sciences, Ludwig-Maximilians Universität (LMU), Munich, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology. (CEMPEG)
Estación Volcanológica de Canarias, IPNA-Consejo Superior de Investigaciones Científicas (CSIC), La Laguna, 38206, Tenerife, Spain.
Scottish Universities Environmental Research Centre (SUERC), East Kilbride, Scotland, UK.
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2013 (English)In: Teide Volcano: Geology and eruptions of a highly differentiated oceanic stratovolcano, Springer Berlin/Heidelberg, 2013, 173-190 p.Chapter in book (Refereed)
Abstract [en]

In Tenerife, lavas of the recent Teide–Pico Viejo central complex show a marked bimodality in composition from initially mafic lava (200–30 ka) to highly differentiated phonolite (30–0 ka). Groundmass Sr–Nd–Pb–O and feldspar 18O data demonstrate open system behaviour for the petrogenesis of Teide–Pico Viejo felsic lavas, but contamination by ocean sediment can be excluded due to the low 206Pb/204Pb ratios of North Atlantic sediment. Isotope mixing hyperbolae require an assimilant of predominantly felsic composition for the Teide–Pico Viejo succession. Unsystematic and heterogeneous variation of 18O in fresh and unaltered feldspars across the Teide–Pico Viejo succession indicates magmatic addition of diverse 18O assimilants, best matched by nepheline syenites that occur as fresh and altered lithic blocks in voluminous pre-Teide ignimbrite deposits. Rare earth element modelling indicates that nepheline syenite needs to be melted in bulk to form a suitable end-member composition. Energy-Constrained Assimilation Fractional Crystallisation (EC-AFC) modelling reproduces the bulk of the succession, which implies that the petrogenesis of Teide–Pico Viejo lavas is governed by the coupled assimilation of nepheline syenite during fractional crystallisation. The most differentiated (and most radiogenic) lava computes to >97.8 % assimilant, likely represented by a nepheline syenite bulk melt that formed by underplating with juvenile mafic material. These recent research developments therefore recognise a wider variability of magmatic differentiation processes at Teide–Pico Viejo than previously considered.

Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2013. 173-190 p.
Series
, Active Volcanoes of the World, ISSN 2195-3589 ; Vol. 1
National Category
Geosciences, Multidisciplinary
Identifiers
URN: urn:nbn:se:uu:diva-287934DOI: 10.1007/978-3-642-25893-0_10ISBN: 978-3-642-25892-3ISBN: 978-3-642-25893-0OAI: oai:DiVA.org:uu-287934DiVA: diva2:924139
Available from: 2016-04-27 Created: 2016-04-26 Last updated: 2016-06-09Bibliographically approved

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Publisher's full texthttp://link.springer.com/chapter/10.1007%2F978-3-642-25893-0_10

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Troll, ValentinDeegan, Frances
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