The Gol‐e‐Zard Zn‐Pb Deposit, Lorestan Province, Iran: a Metamorphosed SEDEX Deposit
7
Citation
26
Reference
10
Related Paper
Citation Trend
Abstract:
Abstract The Gol‐e‐Zard Zn‐Pb deposit is one of several sediment‐hosted Zn‐Pb deposits found in the central part of the Sanadaj‐Sirjan Zone, known as the Isfahan‐Malayer belt, western Iran. Mineralization occurs in Upper Triassic to Jurassic phyllites and meta‐sandstones. Sphalerite and galena are the most abundant metallic ores, with minor chalcopyrite. Calcite and quartz are the main gangue minerals. Fissure filling, replacement textures and especially mineralized faults, suggest an epigenetic stage in the Gol‐e‐Zard deposit formation. Geochemical studies of mineralized rocks show high concentrations of Zn, Pb and Cu, (Zn and Pb > 10000 ppm and Cu average 3000 ppm). LREE enrichment (LREE>HREE, La/Lu average 1.44) and positive Eu anomalies (Eu/Eu*>1 average 1.67) indicate reducing conditions during the deposition of deposit. However, some samples do not display negative Ce anomalies, which indicate that localized oxidizing conditions are also present. This study indicates that the Gol‐e‐Zard deposit formed due to circulating hydrothermal fluids in a marine environment. A SEDEX‐type genesis, which is defined by circulating hydrothermal fluids through sediments in a marine environment, and syngenetic precipitation of Zn and Pb sulphides, is suggested for the Gol‐e‐Zard deposit. Emplacement of some granitoid intrusions such as the Aligudarz granitoid intrusion remobilized mineralizing fluids and metamorphosed the Gol‐e‐Zard deposit.Keywords:
Gangue
Cite
Citations (58)
Sulfide Minerals
Cite
Citations (27)
The primary coexisting mineral with galena is sphalerite. Hence, it is critical to selectively separate galena from sphalerite by flotation. In this work, thiourea and related derivatives as potential flotation collectors for separating galena from sphalerite were investigated. Thiourea and its related derivatives were found to be effective selective collectors in batch flotation studies of a single mineral, with 1,1-diphenylthiourea (11DTA) emerging as the best choice. Galena has superior floatability compared to sphalerite in the presence of 11DTA, and the recovery difference between the two minerals at pH 8 (where the 11DTA concentration is 5 × 10−6 mol/L) is around 38%. This was revealed in batch flotation studies using artificial mixed minerals. Moreover, the findings from the measurements of adsorption amount, FTIR, zeta potential and XPS revealed that 11DTA has a strong adsorption on galena yet a relatively weak adsorption on sphalerite. Additionally, DFT calculations demonstrated that sphalerite exhibits stronger hydrophilicity than galena, and 11DTA possessed a better affinity for galena.
Sulfide Minerals
Lead sulfide
Cite
Citations (2)
Sulfide Minerals
Passivation
Galvanic cell
Cite
Citations (58)