20.500.12556/RUL-148650 Ultraviolet-photoluminescence and trace element analyses in Ga-rich sphalerite from the Djebel Gustar Zn-Pb deposit, Algeria The Djebel Gustar Zn-Pb deposit in northeastern Algeria is one of many carbonate-hosted base metal deposits in the Atlas metallogenic province of North Africa. The sphalerite in this deposit occurs in five distinct types that differ in texture, mineral assemblage, chemical composition, and UV photoluminescence signature. Detailed investigation of trace elements by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) showed that the sphalerite is significantly enriched in the critical metal Ga. The trace element concentrations of the different sphalerite types correlated well with their photoluminescence color; with Mn$^{2+}$ (orange-yellow), Cu$^+$ (green), and Ga$^{3+}$ (red) being the dominant activators. We suggest that the Ga enrichment in the Djebel Gustar deposit is the result of formation conditions that include the mixing of a Cl-rich fluid carrying mainly Zn and Pb with a more reduced and Cl-poor fluid containing considerable organic matter and/or calcite with adsorbed Ga(OH)$_3$. This Ga was subsequently incorporated into sphalerite, rather than forming a stoichiometric Ga phase. Furthermore, our study demonstrates that UV photoluminescence of low Fe sphalerite has the potential to become a simple and affordable tool for preliminary characterization of sphalerite ores in mining and exploration with respect to critical elements such as Ga. sphalerite gallium mineral chemistry critical metal LA-ICP-MS true false true Angleški jezik Ni določen Članek v reviji 2023-08-28 15:19:42 2023-08-28 15:19:43 2023-08-29 04:32:27 0000-00-00 00:00:00 2023 0 0 14 str. Vol. 157, art. 105474 2023 0000-00-00 Zaloznikova Objavljeno apc 0000-00-00 0000-00-00 0000-00-00 55 0169-1368 10.1016/j.oregeorev.2023.105474 151214595 1-s2.0-S0169136823001890-main.pdf 1-s2.0-S0169136823001890-main.pdf 1 60D0FD9F032666734CEA996C93F6889E 525aa9b5c13db5559edff1c6ca74fdd93f41308107842db81c8e5fee0f33ea12 ddccb103-45a5-11ee-a605-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=172938 https://www.sciencedirect.com/science/article/pii/S0169136823001890 0 afdcdc15-45a5-11ee-a605-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=172937 Naravoslovnotehniška fakulteta 0 0 0