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- Title
New insights into the ultrapotassic magmatism through xenoliths from the Eğirdir area, West Anatolia, Turkey.
- Authors
Bernard, Platevoet; Jacques-Marie, Bardintzeff; Ömer, Elitok; Aurélie, Noret; Michel, Grégoire; André, Poisson
- Abstract
Plutonic xenoliths have been found within a pipe and a related phreatomagmatic leucitite deposit in the Eğirdir lake area, belonging to the Potassic-Ultrapotassic Afyon volcanic Province, West Anatolia. They consist of kamafugite-type, feldspar-bearing syenite, pyroxenite, leucitolite, some small-sized melilitolite and garnet-rich xenoliths, and a carbonatite. A new occurrence of kalsilite is described as either homogeneous acicular crystals or tabular two phases-exsolved crystals in the kamafugite-type and melilitolite xenoliths. Rock textures and compositions indicate cumulates and near-liquid composition rocks corresponding to relatively evolved magmas. All the rocks are strongly silica-undersaturated, Ca-, Mg-, and K-rich, and Al-poor. The fractional crystallization model includes clinopyroxene, apatite, phlogopite, melilite and leucite. Fe-Ti oxides and garnet may be also concerned. The PH2O during crystallization and differentiation is not more than 0.8 GPa. Major elements, trace elements, and REE patterns for xenoliths, which indicate near-liquid compositions, are typical of ultrapotassic series in a post-collisional geodynamic context, as it is the case for the Roman and Central ultrapotassic Italian provinces. The stable isotope 13C and 18O values of the calcio-carbonatite plot close to the primary carbonatite field, whereas the carbonates of the feldspar-bearing syenite and the peperite matrix suggest a low-T extensive contamination process. The origin of the carbonatite from kamafugite-type magmas by immiscibility or by fractional crystallization remains questionable; an origin by fractionation-melting of a metasomatized mantle source should be tested in the future.
- Subjects
TURKEY; INCLUSIONS in igneous rocks; GARNET; ROCK texture; SYENITE; MAGMATISM; PYROXENITE
- Publication
Arabian Journal of Geosciences, 2024, Vol 17, Issue 1, p1
- ISSN
1866-7511
- Publication type
Article
- DOI
10.1007/s12517-023-11766-7