Pegmatites and alkali feldspar granites as sources of industrial k-feldspar: a study from Borucu, Aksaray, Central Türkiye

Yıl 2025, Cilt: 178 Sayı: 178, 1 - 2

Gökhan Demirela , Mustafa Haydar Terzi , Ahmet Fatih Oskay

https://doi.org/10.19111/bulletinofmre.1764827

Öz

The Borucu (Aksaray) region, within the Central Anatolian Crystalline Complex, comprises a variety of rocks, including granite, alkali feldspar granite (AFG), pegmatite, and aplite dikes. The granite and AFG host some veins or lenses of pegmatites, with lengths reaching approximately 70 m in the N10-25W direction. The AFG and pegmatitic rocks are characterized by variable mineral assemblages, including K-feldspar (orthoclase), quartz, plagioclase, and to a lesser extent, biotite, garnet, and opaque minerals. Inner zones feature the mega-grained pegmatite, whereas outer zones consist of the coarse-grained K-feldspar and quartz pegmatite. In this study, integrated surface and vertical (trenching and drilling) exploration, mineralogy-petrography, geochemical, and magnetic separation analyses were employed to assess the industrial raw material potential of the AFG and pegmatites. The total alkali (Na2O+K2O) contents reach in 15.56-16.82% for the mega-grained pegmatite, 8.07-9.76% in the coarse-grained pegmatite, and 9.20-9.66% in the AFG. However, the Fe2O3 contents (0.30-1.15%) constrain their industrial raw material quality. Magnetic separation improved the AFG material to second-quality ceramic industry standards. Despite Fe2O3 limitations, Borucu’s pegmatites and AFG represent usable industrial raw material resources.

Anahtar Kelimeler

Alkali Feldspar Granite , Pegmatite , K-Feldspar , Magnetic Separation

Teşekkür

The authors would like to thank Mrs. Hatice Şahin Eroğlu, Mr. Talat Şahan, and Mr. Sinan Keskin, board members of HTS Mining Company, for their valuable support in providing data and logistics during the field studies. The authors would like to express their sincere gratitude to Şafak Altunkaynak and the anonymous reviewer for their insightful comments and constructive suggestions, which have significantly contributed to enhancing the quality of the manuscript. This article is dedicated to the cherished memory of our esteemed Prof. Dr. Taner Ünlü.

Kaynakça

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