Geochemical and Geophysical Relationship of the Potassium-Rich Fenite Zone in Surface and Subsurface Investigations of the Giant Kuluncak (Malatya) Nb-U-REE-Zr-Li Mineralization

Yıl 2025, Cilt: 178 Sayı: 178, 1 - 2

Okan Pulat Murat Kirtil Mustafa Karakaş Mustafa Küçük Ahmet Mert Ulutaş Murat Akgöz , Ali Tugcan Unluer , Hülya Ateş Mehmet Burak Omaç Özkan Türkan

Öz

The Kuluncak (Malatya) district hosts one of the most significant Nb-U-REE-Zr-Li mineralizations in Türkiye, spatially associated with alkaline and carbonatite-related rocks. In this study, geochemical and geophysical investigations were integrated with surface and drillhole data to evaluate the role of fenitization in rare earth element enrichment. The drillhole profiles reveal systematic variations: in marble-hosted sections, light rare earth element (LREE) anomalies occur near-surface zones coupled with KO enrichment, whereas in nepheline syenite-hosted drillholes, REE anomalies are concentrated at intermediate depths (~40-100 m) with heterogeneous distributions. High CaO concentrations, together with fluorite, barite, apatite, and Nb-REE-bearing minerals, confirm a strong carbonatitic contribution. Geophysical anomalies (spectral gamma, magnetic maps) support the geochemical evidence and were used to identify subsurface fenite zones. Comparison with other carbonatite-related systems in Türkiye, such as the Özvatan complex (Kayseri) and Eskisehir, indicates that Kuluncak represents one of the most carbonatite-dominant and LREE-enriched systems in the region. On a global scale, the geochemical features of Kuluncak resemble world-class deposits such as Bayan Obo (China) and Ilímaussaq (Greenland). These findings demonstrate that fenitization and carbonatite-related metasomatism are the principal processes controlling mineralization, highlighting the Kuluncak district as a strategic Nb-REE resource of both national and international importance.

Anahtar Kelimeler

Fenite , Rare Earth Elements (REE) , Niobium (Nb) , Uranium (U) , Zirconium (Zr)

Etik Beyan

Our study was carried out by General Directorate of Mineral Research and Exploration (MTA) under the coordination of the Mineral Research and Explorationwithin the scope of the REE Potential and Lithium Exploration of the Sofular-Kuluncak-Malatya region in Eastern Anatolia between 2014-2020 and within the scope of the Central and Eastern Anatolia REE Exploration Project since 2018.

Destekleyen Kurum

Our study was carried out by General Directorate of Mineral Research and Exploration (MTA) under the coordination of the Mineral Research and Explorationwithin the scope of the REE Potential and Lithium Exploration of the Sofular-Kuluncak-Malatya region in Eastern Anatolia between 2014-2020 and within the scope of the Central and Eastern Anatolia REE Exploration Project since 2018.

Teşekkür

Our study was carried out by General Directorate of Mineral Research and Exploration (MTA) under the coordination of the Mineral Research and Explorationwithin the scope of the REE Potential and Lithium Exploration of the Sofular-Kuluncak-Malatya region in Eastern Anatolia between 2014-2020 and within the scope of the Central and Eastern Anatolia REE Exploration Project since 2018.

Kaynakça

• Balaram, V., 2019. Rare earth elements: A review of applications, occurrence, exploration, analysis, recycling, and environmental impact. Geoscience Frontiers, 10, 1255–1284. https://doi.org/10.1016/j.gsf.2018.12.005
• Beard, C. D., Goodenough, K. M., Borst, A. M., Wall, F., Siegfried, P. R., Deady, E. A., ... & Brauch, K. (2023). Alkaline-silicate REE-HFSE systems. Economic Geology, 118(1), 177-208. Brøgger, W. C. 1921. Die Eruptivgesteine des Kristianiagebiets IV. Das Fengebiet in Telemarken, Norwegen. Norske Videnskaps-Akademi i Oslo, Skrifter, Matematisk-Naturvidenskapelig Klasse, 9, 1–408.
• Camuzoğlu, M., Bağcı, U., Koepke, J., & Wolff, P. E. 2017. Tectonic significance of the cumulate gabbros within Kuluncak ophiolitic suite (Malatya, SE Turkey) inferred from geochemical data. Ofioliti, 42(2), 81–103.
• Camuzoğlu, M., & Bağcı, U. 2018. Sr-Nd-Pb isotope geochemistry of mafic cumulates of the Kuluncak ophiolite (Malatya, SW Turkey). In 8th Geochemistry Symposium, Book of Abstracts. Castor, S.B., Hedrick, J.B., 2006. Rare earth elements. In: Kogel, J.E., Trivedi, N.C., Barker, J.M., Krukowski, S.T. (Eds.), Industrial Minerals and Rocks: Commodities, Markets, and Uses. Society for Mining, Metallurgy, and Exploration, Littleton, CO, pp. 769–792.