Thallium isotopes in Iceland and Azores lavas — Implications for the role of altered crust and mantle geochemistry Sune G. Nielsen a,b, ⁎ , Mark Rehkämper c , Alan D. Brandon d , Marc D. Norman e , Simon Turner a , Suzanne Y. O'Reilly a a GEMOC, Department of Earth and Planetary Sciences, Macquarie University, 2109 NSW, Australia b Department of Earth Sciences, University of Oxford, Parks Road, Oxford, OX1 3PR, UK c Department of Earth Science and Engineering, Imperial College, London SW7 2AZ, UK d NASA Johnson Space Center, Mail Code KR, Building 31, Houston, TX 77058, USA e Research School of Earth Sciences, Australian National University, Canberra, Australian Capital Territory 0200, Australia Received 1 April 2007; received in revised form 3 October 2007; accepted 4 October 2007 Editor: R.W. Carlson Available online 13 October 2007 Abstract Mantle plumes are commonly perceived to have both a chemical and dynamic link with the subduction of ocean crust into the mantle. In principle, this should lead to the observation of chemical and isotopic signatures that are characteristic of ocean crust and marine sediments in ocean island basalts. This study investigates the thallium (Tl) isotope systematics of lavas from Iceland and the Azores archipelago, in order to determine if their compositions were affected by admixing of ferromanganese sediments or upper ocean crust altered at low temperature. Such materials are known to display strongly fractionated Tl isotope signatures relative to the ambient upper mantle. Two samples from the island of Terceira in the Azores archipelago have Tl isotope compositions significantly different from normal mantle, and this suggests the presence of Fe–Mn sediments. Combined Pb and Tl isotope modelling indicates that the Tl anomalies are not a feature of the Azores plume but produced by assimilation of modern Fe–Mn sediments during magma ascent through the ocean crust. Excluding these two anomalous lavas from Terceira, the Iceland and Azores samples have identical Tl isotope compositions, with an overall mean of ɛ 205 Tl= - 1.5 ± 1.4 (2SD, n = 30) that is indistinguishable from the previously estimated upper mantle average (ɛ 205 Tl= - 2.0 ± 0.5). The near-constant Tl isotope compositions of the Iceland and Azores lavas may indicate that the respective mantle plume sources contain virtually no Fe–Mn sediments or altered upper ocean crust. Alternatively, it is possible that the lack of Tl isotope variation reflects quantitative removal of fractionated Tl from the slab during subduction and dehydration. A less straightforward explanation is that past marine environments produced sediments and altered marine basalts with nearly unfractionated Tl isotope compositions. All three scenarios have important implications and future Tl isotope studies will be able to identify the most feasible interpretation. © 2007 Elsevier B.V. All rights reserved. Keywords: mantle plume; crustal recycling; thallium isotopes; stable isotopes; ocean island basalts Available online at www.sciencedirect.com Earth and Planetary Science Letters 264 (2007) 332 – 345 www.elsevier.com/locate/epsl ⁎ Corresponding author. Department of Earth Sciences, University of Oxford, Parks Road, Oxford, OX1 3PR, UK. E-mail address: sunen@earth.ox.ac.uk (S.G. Nielsen). 0012-821X/$ - see front matter © 2007 Elsevier B.V. All rights reserved. doi:10.1016/j.epsl.2007.10.008