Effects of Metasomatism on Granite-Related Mineral Systems: A Boron-Rich Open Greisen System in the Highiş Granitoids (Apuseni Mountains, Romania)

Greisenization is typically linked with highly fractionated granites and often associated hydrothermal vein systems. Late to postmagmatic metasomatic processes involve the enrichment of volatile components such as boron halogens well several metallic elements. The purpose this study reveal main effects paragenetic sequences related mineralizations in Highiş granitoids, Romania. In a natural outcrop, more than 30 samples were collected from felsic veins, country rocks. We carried out detailed mineralogical petrological characterization carefully selected using X-ray powder diffractometry, electron microprobe analysis, microscopic methods together K–Ar ages whole rocks K-bearing minerals. Several characteristic features albitization, sericitization, tourmalinization, epidotization, hematitization recognized studied samples. Crystallization quartz, K-feldspar, magnetite represents first stage during magmatic-hydrothermal transition. mineral assemblage albite, sericite, schorl, quartz originates early stages greisenization. While subsequent assemblages, which predominantly include dravite, specular hematite, epidote, are closely late vein-depositing stage. propose that area could belong boron-rich open greisen system apical portion Guadalupian A-type granite. Based on new hypothesis, previously published Permian crystallization (between ~272 Ma ~259 Ma) be homogenized and/or partially rejuvenated mineralization due uraniferous Additionally, Highiș granite-related suffered Cretaceous thermal overprint ~100 ~96 Ma). results may help understand evolution evolved granite intrusions worldwide improve our knowledge effect emplacement ages.