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New stable isotopic data from mineral separates of albite, scapolite, amphibole, quartz, and calcite of metasomatic rocks (Bamble lithotectonic domain) give increased knowledge on fluid type, source, and evolution duringmetamorphism. Albite from a variety of albitites givesδ18OSMOW values of 5.1–11.1‰,while quartz fromclinopyroxene-bearing albitite gives 11.5–11.6‰. δ 18OSMOW values for calcite samples varies between 3.4 and 12.4‰ and shows more consistent δC values of −4.6 to −6.0‰. Amphibole from scapolite metagabbro yields a δ18OSMOW value of 4.3 to 6.7‰and δDSMOW value of−84 to−50‰,while the scapolite gives δ 18OSMOW values in the range of 7.4 to 10.6‰.These results support the interpretation that the originalmagmatic rocks weremetasomatised by seawater solutions with a possible involvement from magmatic fluids. Scapolitisation and albitisation led to contrasting chemical evolution with respect to elements like P, Ti, V, Fe, and halogens. The halogens deposited as Cl-scapolite were dissolved by albitisation fluid and reused as a ligand for metal transport. Many of the metal deposits in the Bamble lithotectonic domain, including Fe-ores, rutile, and apatite deposits formed during metasomatism. Brittle to ductile deformation concurrent with metasomatic infiltration illustrates the dynamics and importance of metasomatic processes during crustal evolution.

geofluids

Dynamic Metasomatism: Stable Isotopes, Fluid Evolution, and Deformation of Albitite and Scapolite Metagabbro (Bamble Lithotectonic Domain, South Norway)