The genesis and timing of formation the giant Bayan Obo deposit, world's largest rare earth element (REE) deposit in western part late Paleozoic northern North China continental arc (NCA), are highly controversial due to complex mineral assemblages reported ages mineralization. We conducted new zircon U-Pb 40Ar/39Ar dating metamorphic igneous Neoarchean Permian mid-to upper-crustal rocks exhume...

This contribution illustrates the procedures of calculating rare earth element (REE) patterns of magmatic fluids in equilibrium with granitic melts. These patterns can then be compared to those of altered and (or) mineralized rocks in order to investigate the source of the ore-fluids. This technique is applied to the Lake George Sb-Au-W-Mo mineral deposit, New Brunswick, Canada. The results sug...

Egypt is mainly covered by ophiolitic rocks, muscovite, and two mica granites, in addition to different types of acidic basic dikes. Our field observations indicated that El Sela granites were subjected alteration such as silicification, kaolinization, hematitization, which associated with uranium mineralization. Petrographic investigations clarified these rocks affected saussiritization, musco...

The data obtained from field and geothermometric studies and also the REE composition of fluorites associated with lead mineralization at the Kamar-Mehdi mine are compatible with a structurally controlled, fissure filling, epigenetic, hydrothermal origin. Homogenization and last ice melting temperatures for primary fluid inclusions trapped in fluorite crystals indicate that the mineralizati...

Abstract The rare earth elements (REE) are critical raw materials for much of modern technology, particularly renewable energy infrastructure and electric vehicles that vital the transition. Many world’s largest REE deposits occur in alkaline rocks carbonatites, which found intracontinental, rift-related settings, also syn- to post-collisional settings. Post-collisional settings host significan...

The traditional approaches of modeling and estimation of highly skewed deposits have led to incorrect evaluations, creating challenges and risks in resource management. The low concentration of the rare earth element (REE) deposits, on one hand, and their strategic importance, on the other, enhances the necessity of multivariate modeling of these deposits. The wide variations of the grades and ...

zafarabad iron deposit is located northwest of divandareh, in the northern margin of sanandaj-sirjan plutonic-metamorphic zone. the deposit is in lentoid to tubular shape, within a shear zone and occrrued in host rocks of calc-schist and limestone. magnetite with massive, cataclastic and replacement textures are the main phases, while pyrite and other sulfide minerals are found. major and trace...

kalchouyeh area in southwest of naein is located in the urumieh-dokhtar volcano-plutonic belt. mineralization occurred mainly as disseminations and veinlets hosted by trachy-andesite and pyroxene andesites. for mineralogy, alteration, fluid inclusion and geochemical studies, the two major mineralized zones: a (larger vein) from the north-northwest and b (smaller vein) from the east-southeast of...