Articles | Volume 35, issue 6
https://doi.org/10.5194/ejm-35-1031-2023
https://doi.org/10.5194/ejm-35-1031-2023
Research article
 | 
23 Nov 2023
Research article |  | 23 Nov 2023

H2O and Cl in deep crustal melts: the message of melt inclusions in metamorphic rocks

Silvio Ferrero, Alessia Borghini, Laurent Remusat, Gautier Nicoli, Bernd Wunder, and Roberto Braga

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Cited articles

Acosta-Vigil, A., London, D., Morgan VI, G. B., Cesare, B., Buick, I., Hermann, J., and Bartoli, O.: Primary crustal melt compositions: Insights into the controls, mechanisms and timing of generation from kinetics experiments and melt inclusions, Lithos, 286, 454–479, https://doi.org/10.1016/j.lithos.2017.05.020, 2007. 
Acosta-Vigil, A., Buick, I., Hermann, J., Cesare, B., Rubatto, D., London, D., and Morgan VI, G. B.: Mechanisms of crustal anatexis: A geochemical study of partially melted metapelitic enclaves and host dacite, SE Spain, J. Petrol., 51, 785–821, https://doi.org/10.1093/petrology/egp095, 2010. 
Acosta-Vigil, A., Buick, I., Cesare, B., London, D., and Morgan, G. B.: The extent of equilibration between melt and residuum during regional anatexis and its implications for differentiation of the continental crust: A study of partially melted metapelitic enclaves, J. Petrol., 53, 1319–1356, https://doi.org/10.1093/petrology/egs018, 2012. 
Acosta-Vigil, A., Barich, A., Bartoli, O., Garrido, C. J., Cesare, B., Remusat, L., Poli, S., and Raepsaet, C.: The composition of nanogranitoids in migmatites overlying the Ronda peridotites (Betic Cordillera, S Spain): the anatectic history of a polymetamorphic basement, Contrib. Mineral. Petr., 171, 24, https://doi.org/10.1007/s00410-016-1230-3, 2016. 
Acosta-Vigil, A., Cesare, B., London, D., Morgan VI, G. B.: Microstructures and composition of melt inclusions in a crustal anatectic environment, represented by metapelitic enclaves within El Hoyazo dacites, SE Spain, Chem. Geol., 235, 450–465, https://doi.org/10.1016/j.chemgeo.2006.07.014, 2017. 
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Short summary
Garnet often entraps small droplets of deep melts generated during mountain building processes. Using high-resolution techniques, we studied these droplets in order to provide hard numbers for the quantification of volatile budgets during crustal evolution, show how even melts formed at >1000°C contain water, and clarify how water behaves during metamorphism and melting at the microscale. Moreover, we provide the very first data on chlorine in natural melts from crustal reworking.