Drying and dying of a subducted slab: Coupled Li and B isotope variations in Western Anatolia Cenozoic Volcanism |
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| Authors: | Samuele Agostini Jeffrey G Ryan Sonia Tonarini Fabrizio Innocenti |
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| Institution: | aCNR — Istituto di Geoscienze e Georisorse, Via G. Moruzzi 1, 56124 Pisa, Italy;bDepartment of Geology, University of South Florida, Tampa, USA;cDipartimento di Scienze della Terra, Università di Pisa, Pisa, Italy |
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| Abstract: | In lavas spanning ~ 10Ma of subduction-related volcanism in Western Anatolia, we observe remarkably similar patterns of δ7Li and δ11B variation. In this setting, magmatism records a transition from calc–alkaline to ultrapotassic character, consistent with overall lower mean extents of melting, and a changing mantle source that reflects a fractionating, higher temperature slab input consistent with the gradual cessation of subduction. Subsequent rift-related intraplate magmatism record δ7Li signatures within the range observed for MORBs and OIBs, indicating an abrupt transition to a mantle source unmodified by subduction. |
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| Keywords: | Li isotopes slab dehydration Cenozoic volcanism Mediterranean area |
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