Abstract
We studied the elemental and isotopic (Pb, B and Li isotopes) composition of melt inclusions hosted in highly forsteritic (Fo83–91) olivines that were collected from San Bartolo lava and pumice (ST79p, ST82p and ST531p) samples erupted by Stromboli in historical times. The studied melt inclusions have primitive calcalkaline to shoshonitic basaltic compositions. They cover a compositional range far wider than that exhibited by the whole-rocks and differ in key trace element ratios. San Bartolo melt inclusions are characterized by lower incompatible trace element abundances, higher ratios between fluid-mobile (B, Pb, U and LILE) and less fluid-mobile (REE, Th, HFSE) elements and lower La/Yb ratios relative to the pumice-hosted melt inclusions and pumiceous melts erupted during paroxysmal events. Trace elements, along with different Pb, B and Li isotopic signatures, attest to source heterogeneity on the small scale and provide new insights into subducted components beneath Stromboli. Results of a mixing model suggest that metasomatism of the mantle source of pumice-hosted melt inclusions was driven by solute-rich high-pressure fluids (<20%) expelled from the deep portion of the slab. Heterogeneous Pb isotopic composition together with light δ11B (−8.6 to −13.7‰) and δ7Li (+2.3 to −1.7‰) indicates that high-pressure liquids were released in variable proportions from highly dehydrated metabasalts and metasediments. On the other hand, the elemental and isotopic (δ11B ~ −1.9 to −5.9‰) composition of San Bartolo melt inclusions is better explained by the addition of a prevalent aqueous component (~2 to 4%) escaped at shallower depths from sediments and altered basaltic crust in almost equivalent proportions, with a smaller contribution by high-pressure fluids. Owing to the high-angle dip of the subducted cold Ionian slab, aqueous fluids and high-pressure fluids would rise through the mantle wedge and locally superimpose on each other, thus giving origin to variously metasomatized mantle domains.
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Acknowledgments
We are indebted to A. Bertagnini and N. Métrich for providing samples and electron microprobe analyses, and for valuable discussions and suggestions. F.S. and R.V. are thankful to COE-21 (Japan) and the scientific and administrative staff of ISEI for providing the opportunity to conduct research in the PML laboratory. We gratefully acknowledge T. Akalu, A. Makishima, M. Marín-Cerón, L. Ottolini, M. Palenzona, M. Pompilio, C. Sakaguchi, R. Tanaka, and A. Zanetti for providing laboratory assistance, for carrying out XRF, ICP-QMS and SIMS-4f analyses, and for collaboration through scientific discussions. S. Aulbach and P. Tomascak are warmly acknowledged for their careful and constructive reviews, which considerably improved the early version of this paper. This research was supported by MIUR, CNR (Italy) and COE-21 (Japan) funds.
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Schiavi, F., Kobayashi, K., Nakamura, E. et al. Trace element and Pb–B–Li isotope systematics of olivine-hosted melt inclusions: insights into source metasomatism beneath Stromboli (southern Italy). Contrib Mineral Petrol 163, 1011–1031 (2012). https://doi.org/10.1007/s00410-011-0713-5
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DOI: https://doi.org/10.1007/s00410-011-0713-5