Rezvan Mehvari, Moussa Noghreyan, Mortaza Sharifi, Mohammad Ali Makizadeh, Seyed Hassan Tabatabaei
Journal Neues Jahrbuch für Geologie und Paläontologie-Abhandlungen Volume 281 Issue 3 Pages 283-311 Publisher E. Schweizerbart'sche Verlagsbuchhandlung
Description: The Nabar kaolin deposit is located 29 km south of Kashan in the Isfahan province and is part of the Iranian Central structural zone. Field evidence and geochemical study shows that the Nabar deposit is an alteration product of Eocene volcanic rocks. The major minerals are quartz, kaolinite, dickite, illite, montmorillonite, albite, muscovite, along with lesser amounts of anatase, diaspore, goethite and alunite. Element mass change calculations, assuming Al as the low to immobile index element, indicate that leaching and fixation are two prominent factors controlling the concentration of major, minor, trace, and rare earth elements. Geochemical studies show that variation of the negative to weak positive Eu anomalies (0.57-1.10) and negative to weak positive Ce anomalies (0.77-1.04) at Nabar were, respectively, controlled by the degree of feldspar alteration and changes in the rate of oxidation potential of the …