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

Abstract 2 O, halogens and other species (e.g. CO2, N) partitioned into the deep partial melts generated during metamorphism of the continental crust. Here we present new datasets of NanoSIMS measurements of H2 O and Cl in preserved melt inclusions from metamorphic rocks with different protoliths – magmatic or sedimentary – which underwent partial melting at different pressure–temperature–fluid conditions. These new datasets are then compared with similar data on natural anatectic melts available in the literature to date. Our study provides novel, precise constraints for the H2 O content in natural melts formed at high pressure, a field previously investigated mostly via experiments. We also show that H2 O heterogeneities in partial melts at the microscale are common, regardless of the rock protolith. Correlations between H2 O contents and P T 2 O, even for the hottest melts found so far (> 1000  ∘ C). Moreover, in agreement with previous work, preserved glassy inclusions always appear to be poorer in H2 O than crystallized ones, regardless of their chemical system and/or P T > 1000  ppm) acquired in situ on natural anatectic melts, showing how anatectic melt inclusions – additionally to magmatic ones – may become a powerful tool to clarify the role of halogens in many geological processes, not only in crustal evolution but also in ore deposit formation.

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch

References and Relationships

• Bibliographic citation: H₂O and Cl in deep crustal melts: the message of melt inclusions in metamorphic rocks ; volume:35 ; number:6 ; year:2023 ; pages:1031-1049 ; extent:19 ; European journal of mineralogy ; 35, Heft 6 (2023), 1031-1049 (gesamt 19)

Contributors, Places and Time

• Creator: Ferrero, Silvio ; Borghini, Alessia ; Remusat, Laurent ; Nicoli, Gautier ; Wunder, Bernd ; Braga, Roberto

Further information

• DOI: 10.5194/ejm-35-1031-2023
• URN: urn:nbn:de:101:1-2023113003380395854394
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 15.08.2025, 7:33 AM CEST