scholarly journals Constraints on ore formation conditions at the Mazra’eh Shadi epithermal deposit, NE Tabriz, Iran: evidences from geochemistry, sulphur isotope, quartz textures and fluid inclusion studies

2019 ◽  
Author(s):  
Kaikhosrov RADMARD ◽  
Hassan ZAMANIAN ◽  
Mohammad Reza HOSSEINZADEH ◽  
Ahmad Ahmadi KHALAJI
Keyword(s):  
Fluid Inclusion ◽  
Epithermal Deposit ◽  
Sulphur Isotope ◽  
Ore Formation ◽  
Formation Conditions ◽  
Quartz Textures

scholarly journals Primorskoye epithermal Ag-Au deposit (Northeast of Russia): geologic aspects, mineralogic and geochemical features, and ore formation conditions

2019 ◽  
Vol 61 (1) ◽  
pp. 52-74
Author(s):  
N. E. Savva ◽  
A. V. Volkov ◽  
A. A. Sidorov ◽  
E. E. Kolova ◽  
K. Yu. Murashov
Keyword(s):  
High Temperature ◽  
Elevated Concentration ◽  
Epithermal Deposit ◽  
Ore Formation ◽  
Low Concentrations ◽  
Formation Conditions ◽  
High Concentrations ◽  
Chemical Conditions ◽  
Physical And Chemical

As a potentially large Ag-Au epithermal deposit, Primorskoye comprises the following three areas: Kholodny, Spiridonych, and Teply. This deposit is located in the Omsukchan district of the Magadan Region, where similar deposits, including Dukat, Lunnoye, Goltsovoye, Arylakh, Tidit, and Perevalnoye, have developed. The deposit can be attributed to the Kalalagian volcano-tectonic depression and is localized in a flat-lying rock mass in the Late Cretaceous ignimbrites and rhyolites having thicknesses of greater than 700 m, which is cut through by numerous dykes of medium and major composition. According to the drilling data, the solid mass of leucocratic granites is located in deposits at a depth of 400–500 m with outcrops in the northeastern part of the ore field. The presence of Bi-containing galena and matildite, the availability of mid and high temperature facies of metasomatites (epidote and actinolite), and the specific physical and chemical conditions during the formation of the epithermal Ag-Au ores indicate the intrusive position above and the role of granitoids as generators of high temperature magmatic fluids, which introduced Bi and heated the rocks enclosing the mineralization. The geochemical features of the ores are well correlated with their mineral compositions. The high concentrations of Mn and Ag, elevated concentration of Au, low concentrations of Cu, Pb, Zn, Sb, As, Bi, and Te, low sum of REE, and negative Eu- and positive Се-anomalies were observed. The high values of the Te/Se, Sr/Ba, Y/Ho, and U/Th indicators in the ores are associated with the deposit location in the zone of granitoid massif effect. Further, the physical and chemical parameters of ore formation in the Teply area are unusual and are characterized by high temperatures, low concentrations of salts, and fluid density, which are indicative of the typical “dry steam” conditions. The obtained results allow the Primorskoye epithermal deposit to be attributed to the intermediate class. The information present in the article is practically valuable for the regional forecast and metallogenic developments as well as for searching and assessing the epithermal Ag-Au deposits.

scholarly journals PHYSICAL-CHEMICAL FORMATION CONDITIONS OF URANIUM-TITANIUM-METAGEL MINERALIZATION AT THE GOLD-URANIUM ELKON DEPOSIT

2017 ◽  
pp. 52-57 ◽  
Author(s):  
M. M. Komarova ◽  
VL. B. Komarov ◽  
A. P. Aleshin ◽  
T. L. Krylova
Keyword(s):  
Crystalline Form ◽  
Fluid Regime ◽  
Ore Formation ◽  
Physical Chemical ◽  
Wide Range ◽  
Moderate Salinity ◽  
Formation Conditions ◽  
Carbonate Composition ◽  
Main Factor

A wide range of the temperatures of hydrothermal fluid regime (430-103 °C) has been revealed in the result of microthermometric study of the fluid inclusions in the minerals of pre-ore and post-ore stages developed at the Elkon deposit. Average temperatures, as well as the temperature variation are similar for both pre-ore and post-ore stages. It allows sure determination of temperatures of uranium ore formation as 400-120 °C. Fluids possessed Na-chloride, rarely Na-chloride-carbonate composition and moderate salinity (6-16 wt. % · NaCl equiv.). The wide range of tem-peratures confirms an assumption made before that various temperatures were the reason of formation of uranium mineralization both in the form of predominantly amorphous phase (U-Ti-metagel), as well as the rarely crystalline form (brannerite). Abrupt temperature decrease was apparently the main factor of the ore precipitation.

A model of boiling for fluid inclusion studies: Application to the Bolaños Ag–Au–Pb–Zn epithermal deposit, Western Mexico

2011 ◽  
Vol 110 (2) ◽  
pp. 118-125 ◽  
Author(s):  
Carles Canet ◽  
Sara I. Franco ◽  
Rosa María Prol-Ledesma ◽  
Eduardo González-Partida ◽  
Ruth Esther Villanueva-Estrada
Keyword(s):  
Fluid Inclusion ◽  
Epithermal Deposit ◽  
Western Mexico

Ore formation at the Kupol epithermal gold-silver deposit in northeastern Russia deduced from fluid inclusion study

2012 ◽  
Vol 54 (4) ◽  
pp. 295-303 ◽  
Author(s):  
A. V. Volkov ◽  
V. Yu. Prokof’ev ◽  
N. E. Savva ◽  
A. A. Sidorov ◽  
M. A. Bayankin ◽  
...  
Keyword(s):  
Fluid Inclusion ◽  
Northeastern Russia ◽  
Fluid Inclusion Study ◽  
Silver Deposit ◽  
Epithermal Gold ◽  
Ore Formation ◽  
Gold Silver ◽  
Inclusion Study

A fluid inclusion and stable isotope study of synmetamorphic copper ore formation at Mount Isa, Australia

1989 ◽  
Vol 84 (3) ◽  
pp. 529-550 ◽  
Author(s):  
Christoph A. Heinrich ◽  
Anita S. Andrew ◽  
Ronald W. T. Wilkins ◽  
David J. Patterson
Keyword(s):  
Stable Isotope ◽  
Fluid Inclusion ◽  
Copper Ore ◽  
Ore Formation ◽  
Mount Isa ◽  
Isotope Study ◽  
Stable Isotope Study
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