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Hf isotope compositions of northern Luzon arc lavas suggest involvement of pelagic sediments in their source

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Abstract

New Hf isotopic compositions for island arc basalts from the Luzon arc (Philippines) define a remarkable sub-horizontal trend in Hf–Nd isotopic space with a small range of ɛHf (+5 to +17) associated with a large variation in ɛNd (−7 to +8). The data plot above and barely overlap the terrestrial array defined by oceanic basalts and continental crust. Mixing hyperbolas passing through the data intersect fields for depleted mantle and pelagic sediments suggesting that these two components formed the source of the Luzon arc lavas. An exception is the Batan Island where the low ɛNd ratios are associated with low ɛHf values. A mixing hyperbola fitting the Batan samples suggests that their mantle source was modified by subducted material prior to contamination by terrigenous clays. More generally, the geochemical relationships in Luzon lavas show that the mixing endmembers are source components rather than melts. The relationship between Nd and Hf isotopic compositions in the Luzon volcanics show that the type of sediment subducted under an island arc is a determining factor in the control of the two isotopic systems in island arc environments.

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Acknowledgments

This work benefitted of valuable help from Francine Keller in the clean lab and on the ICP-MS and of Janne Blichert-Toft and Philippe Telouk while using the Plasma 54 in Lyon. Discussions with Terry Plank, Nicholas Arndt and Mireille Polvé contributed to major improvements in the manuscript. Very careful and pertinent reviews by an anonymous reviewer, Chris Hawkesworth, Julian Pearce, Alex Halliday and Al Hofmann helped us produce a more thorough and balanced interpretation of our data with respect to earlier versions of the paper. This work was financial supported by CNRS through the Dyeti program.

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Appendix

  Major elements, Sr, Pb and O isotopic data of the Luzon arc lavas analyzed for trace elements and Hf isotopic compositions. Data from Richard et al. 1986a, 1986b; Vidal et al. 1989; Defant et al. 1990; McDermott et al. 1993; Fourcade et al. 1994 and Maury et al. 1998

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Marini, JC., Chauvel, C. & Maury, R.C. Hf isotope compositions of northern Luzon arc lavas suggest involvement of pelagic sediments in their source. Contrib Mineral Petrol 149, 216–232 (2005). https://doi.org/10.1007/s00410-004-0645-4

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