The Evolution of the REE-Bearing Özvatan Nepheline Syenite-Carbonatite Complex, Central Turkey: Mineralogical, Geochemical, and Stable Isotopic Approaches

Ali Tugcan Unluer*, Murat Budakoglu, Zeynep Doner, Amr Abdelnasser

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Araştırma sonucu: ???type-name???Makalebilirkişi

2 Atıf (Scopus)

Özet

Carbonatite complexes and associated fenite zones are famous for their high-grade rare metal ores. The carbonatite–fenite complexes generally contain high concentrations of light rare earth elements (LREE), thorium (Th), and uranium (U). While most carbonatites are closely related to continental rift zones, some complexes can be observed in post-collisional tectonic environments. The Özvatan nepheline syenite–carbonatite complex is an example of post-collisional carbonatitic magmatism in Central Anatolia, Turkey. The magmatic suite is generally composed of silica-undersaturated ultra-alkaline rocks and carbonatite dikes accompanied by high-intensity fenite zones. The carbonatites of the complex are generally dominated by coarse-grained calcite minerals accompanied by fluorite phenocrysts and may also contain minor amounts of rock-forming silicate minerals. The metasomatic aureole zones (fenites) are mainly composed of euhedral nephelines, K-feldspars, aegirines, augites, and garnets. Carbonatites of the Özvatan complex show enrichments in Ca and F with depletion of alkaline (K and Na) elements. Carbonatites and fenite zones of the Özvatan complex host a variety of incompatible elements, including La, Ce, Nd, Th, U, and Nb. The isotopic composition and general geochemical properties of carbonatites in the study area represent mantle-derived carbonatites rather than crustal limestones/skarns.

Orijinal dilİngilizce
Makale numarası667
DergiMinerals
Hacim13
Basın numarası5
DOI'lar
Yayın durumuYayınlandı - May 2023

Bibliyografik not

Publisher Copyright:
© 2023 by the authors.

Finansman

The authors would like to thank the members of the Geochemistry Research Laboratories of Istanbul Technical University (ITU/JAL) for their effort with geochemical analysis. The authors would also like to thank Huseyin Kocaturk for the electron microprobe analysis. A.A. would like to thank the Ministry of Higher Education of Egypt as well as the Scientific and Technological Research Council of Turkey (2221-TUBITAK Fellowship Program) for supporting his research stay at Istanbul Technical University (Turkey) as a postdoctoral fellow. In addition, thank you Demet Yıldırım and Sercan Öztürk for help during fieldwork. The handling editor and three anonymous reviewers are acknowledged for their insightful comments and suggestions that improved the presentation and interpretations of our work.

FinansörlerFinansör numarası
Ministry of Higher Education, Egypt
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu
Istanbul Teknik Üniversitesi

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