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Li, Be, B concentrations and δ7Li values in plagioclase phenocrysts of dacites from Nea Kameni (Santorini, Greece)

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Abstract

Li, Be, B and δ7Li SIMS analyses of plagioclase phenocrysts from the 1040–1941 Niki dacite lava (Nea Kameni, Santorini, Greece) exhibit varied processes. From their anorthite contents alone, the crystals may be segregated into four main types: type-N shows the normal decline in An during crystallisation (An62–40); type-O has only oscillatory zoning accompanied by resorption surfaces (An58–39); type-C is complex with high-An cores (subtype C1: An64–58, subtype C2: An88–73) and normal rims (An55–42). Type-A plagioclase with high An content (An92–82) is found within mafic enclaves. On the basis of their Li concentrations, type-O crystals may be subdivided into subtype O1 with flat Li concentration profiles and subtype O2 with decreasing Li concentration from core to rim. The concentrations of Be and B of all four types show a negative correlation with anorthite content (An), but Li concentration profiles differ amongst the different plagioclase types. Types N and O1, and the cores of type-C, are equilibrated in Li concentration. Types O2 and A, and the mantles of type-C display an initial enrichment in Li, probably from volatile influx into the melt. Consistent with the propensity towards equilibrium with the melt, these crystals display dramatic rim-ward declines in Li concentration. All analysed plagioclase crystals, except for the xenocrystic type-A, have nearly the same Li, Be and B concentrations at their rims. These coincide with the composition of plagioclase microlites in the groundmass, thereby affording estimates of plagioclase-melt partitioning for the light elements: K Li = 0.19–0.28, K Be = 0.24–0.38 and K B = 0.007–0.009. δ7Li profiles in type-O2 and type-A phenocrysts manifest an unmistakable inverse relation to Li concentration, with variations of up to ~39 ‰, revealing preferential kinetic diffusion. This may have been driven by Li loss from the melt, most likely through degassing during decompression, perhaps in the course of magma ascent to subsequent eruption. Considering the rapid diffusion of Li in plagioclase, in situ phenocryst analyses may yield useful information about processes leading up to, or even causing, eruptions.

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Acknowledgments

This research was supported by a Ph.D. stipend from the German Academic Exchange Service (DAAD) to Joan A. Cabato. Ilona Fin and Oliver Wienand are thanked for preparing high-quality polished thin sections. Oleksandr Varychev helped with the SEM work. We also thank Sandra Panienka, Iris Sonntag and Ralf Dohmen for discussions, and Adam Kent for helpful comments.

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Authors and Affiliations

  1. Department of Earth Sciences, University of New Hampshire, 56 College Road, Durham, NH, 03824, USA

    Joan Cabato

  2. Institut für Geowissenschaften, Universität Heidelberg, Im Neuenheimer Feld 234-236, 69120, Heidelberg, Germany

    Rainer Altherr, Thomas Ludwig & Hans-Peter Meyer

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  1. Joan Cabato
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Correspondence to Joan Cabato.

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Communicated by T. L. Grove.

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Cabato, J., Altherr, R., Ludwig, T. et al. Li, Be, B concentrations and δ7Li values in plagioclase phenocrysts of dacites from Nea Kameni (Santorini, Greece). Contrib Mineral Petrol 165, 1135–1154 (2013). https://doi.org/10.1007/s00410-013-0851-z

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