Experimental Annealing of Zircon: Influence of Inclusions on Stability, Intracrystalline Melt Migration, Common Lead Leaching, and Permeability to Fluids Morales López, Irene Molina Palma, José Francisco Cambeses Torres, Aitor González Montero, María Del Pilar Bea Barredo, Fernando Zircon annealing Mineral inclusions Glass inclusions Melt migration Baddeleyite-zircon stability relationships Tungstate dissolution-reprecipitation Common Pb leaching We are indebted to Yamirka Rojas-Agramonte, Ian Williams, and an anonymous reviewer for their constructive comments. The thorough revision and editorial handling by Sumit Chakraborty are also gratefully acknowledged. This work has been financially supported by the research projects CGL2017-84469-P funded by MCIN/AEI/10.13039/501100011033/FEDER "Una manera de hacer Europa", PID2020-114872GB-I00 funded by MCIN/AEI/10.13039/501100011033, and P20 _00550, P18-FR-1696 and A-RNM-245-UGR18 funded by FEDER/Junta de Andalucia-Consejeria de Transformacion Economica, Industria, Conocimiento y Universidades, and by grants PRE2018-083193 to I.M., funded by MCIN/AEI/10.13039/501100011033 y FSE "El FSE invierte en tu futuro" and IJC2018-037960-I to A.C. funded by MCIN/AEI/10.13039/501100011033 (Juan de la Cierva program) . Funding for open access charge: Universidad de Granada/CBUA . It is the IBERSIMS publication no. 82. Zircon derived from crustal rocks can survive dissolution into hot basalts during magma hybridization and rock assimilation if it is shielded as an inclusion phase in early-formed phenocrysts or in minerals from non-disaggregated xenoliths. Under these conditions, zircon can be thermally shocked, triggering recrystallization of metamict domains and reaction with its hosted mineral inclusions. This work simulates this process by performing thermal annealing experiments on zircon grains with variable degrees of metamictization. These were embedded in cristobalite powder under a N2 atmosphere at 1 bar and 1300 °C. The thermal annealing produces recrystallization of metamict domains, melting of multi-phase mineral inclusions, nanopore formation, and microcrack propagation by thermo-elastic stress. The porosity enhances intracrystalline melt mobility, leaching out trace-element and mineral impurities. Baddeleyite was formed at temperatures below the thermal decomposition of pure zircon by two mechanisms: (i) recrystallization of metamict domains assisted by silica migration from the reaction site and (ii) incongruent zircon dissolution into molten mineral inclusions with a high CaO/ SiO2 ratio. Highly metamict zircons with elevated common Pb and radiogenic Pb loss, which were impossible to date with SHRIMP, lost all their common Pb and some radiogenic Pb upon annealing, producing well-fitted discordias with a significant upper intercept age. 2022-02-03T09:27:52Z 2022-02-03T09:27:52Z 2022-01-11 journal article Morales, I... [et al.] (2022). Experimental Annealing of Zircon: Influence of Inclusions on Stability, Intracrystalline Melt Migration, Common Lead Leaching, and Permeability to Fluids. ACS Earth and Space Chemistry. [https://doi.org/10.1021/acsearthspacechem.1c00212] http://hdl.handle.net/10481/72633 10.1021/acsearthspacechem.1c00212 eng http://creativecommons.org/licenses/by/3.0/es/ open access Atribución 3.0 España American Chemical Society