Global factors of lead-zinc ore formation

2019 ◽  
pp. 3-10
Author(s):  
A. L. Dergachev
Keyword(s):  
Continental Crust ◽  
Island Arcs ◽  
Geological Time ◽  
Crust Formation ◽  
Ore Formation ◽  
Global Factor ◽  
Lead And Zinc ◽  
Lead Zinc ◽  
Cyclic Changes

Tectonic evolution of the Earth is a principle global factor responsible for uneven distribution of lead and zinc reserves in geological time. Cyclic changes in productivity of lead-zinc ore-formation processes resulted from periodical amalgamation of most blocks of continental crust, formation, stabilization and final break-up of supercontinents. Many features of age spectrums of lead and zinc reserves are caused by gradual increase of volume of continental crust resulting from accretion of island arcs to ancient cratons, widening of distribution of ensialic environments of ore-formation and increasing role of continental crust in magmatic processes.

FEATURES OF LEAD AND ZINC METALLOGENY WITHIN THE YENISEI RIDGE

2020 ◽  
pp. 68-84
Author(s):  
S. M. Makeev ◽  
E. A. Muromtsev ◽  
V. A. Makarov ◽  
G. V. Belokonov
Keyword(s):  
Siberian Platform ◽  
Yenisei Ridge ◽  
Tectonic Structures ◽  
Ore Formation ◽  
Lead And Zinc ◽  
Location Patterns ◽  
Lead Zinc ◽  
Polymetallic Mineralization ◽  
The Relationship ◽  
Geological Formations

Information collected on deposits, ore occurrences, and lead and zinc mineralization points known within the Yenisei Ridge is provided. A summary of the latest data on the geology and metallogeny of lead and zinc in the region is presented. A brief description of the deposits is given and their ore formation typification is carried out. The position of deposits in a stratigraphic section, the relationship with geological formations and tectonic structures, and subsequent conclusions about deposit location patterns and metallogenic zonality of the area were examined. The position analysis of polymetallic mineralization in regional geophysical and geochemical field revealed the presence of lead → zinc → barium trend from the Ishimbinsk fault towards the Siberian platform and the potential discovery of economically significant polymetallic mineralization in the eastern Yenisei Ridge.

LEAD AND ZINC DEPOSIT FORMATION CONDITIONS WITHIN ANGARA-BOLSHEPITSK MINERAGENIC ZONE, YENISEI RIDGE

2020 ◽  
pp. 52-67
Author(s):  
M. N. Zaitseva ◽  
V. V. Kuznetsov ◽  
V. D. Konkin ◽  
T. V. Seravina ◽  
A. V. Inyakin ◽  
...  
Keyword(s):  
Practical Interest ◽  
Yenisei Ridge ◽  
Organic Carbon Content ◽  
Structural Factors ◽  
Ore Formation ◽  
Factors Affecting ◽  
Lead And Zinc ◽  
Formation Conditions ◽  
The Relationship

The paper shows the main characteristics for geological and associated ore formations in the Tungusik formation complex. Ore formation deposit types and ore field types in the region are identified and described. Based on the identified lithofacies, the paleoenvironment of stratiform ore associations formation is characterized. The role of metamorphism and structural factors affecting prospecting conditions are shown. The relationship between the mineral type of ores and organic carbon content in ore-bearing strata for various geological and economic types has been revealed. The obtained and generalized data are of practical interest in designing forecasting/prospecting deposit models and improving prospecting efficiency.

scholarly journals Occupational exposure in lead and zinc mines induces oxidative stress in miners lymphocytes: Role of mitochondrial/lysosomal damage

2020 ◽  
Vol 43 (1) ◽  
pp. 154-163
Author(s):  
Enayatollah Seydi ◽  
Mahshid Soltani ◽  
Maral Ramazani ◽  
Mohammad Hadi Zarei ◽  
Jalal Pourahmad
Keyword(s):  
Oxidative Stress ◽  
Control Group ◽  
Lead And Zinc ◽  
Toxic Agents ◽  
Oxidative Stress Status ◽  
Lead Zinc ◽  
Zinc Mine ◽  
And Oxidative Stress ◽  
Mine Workers

AbstractThe purpose of this research was to determine mitochondrial and lysosomal damage and oxidative stress status in blood lymphocytes of lead-zinc miners. This research was performed in 10 mine workers who have been in contact with lead and zinc in comparison to a control group containing 10 healthy volunteers. Lymphocytes were isolated from peripheral blood using the Ficoll standard method and then mitochondrial and lysosomal damage and oxidative stress were evaluated. The level of reactive oxygen species (ROS), collapse in the mitochondrial membrane potential (MMP) collapse, and glutathione disulfide (GSSG) content, and lysosomal damage in miners were higher than the control group. Also, viability and glutathione (GSH) content were decreased. The lymphocytes of workers of a lead-zinc mine are more susceptible to oxidative stress, mitochondrial and lysosomal damage. The proper use of safety equipment can reduce the risk of toxic agents and their subsequent hazards for mine workers.

scholarly journals Critical importance of pH and collector type on the flotation of sphalerite and galena from a low-grade lead–zinc ore

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Abdolrahim Foroutan ◽  
Majid Abbas Zadeh Haji Abadi ◽  
Yaser Kianinia ◽  
Mahdi Ghadiri
Keyword(s):  
Iron Ore ◽  
Low Grade ◽  
Zinc Recovery ◽  
Flotation Process ◽  
Ph Values ◽  
Lead And Zinc ◽  
Optimum Ph ◽  
Iron And Zinc ◽  
Lead Zinc ◽  
Zinc Concentrate

AbstractCollector type and pulp pH play an important role in the lead–zinc ore flotation process. In the current study, the effect of pulp pH and the collector type parameters on the galena and sphalerite flotation from a complex lead–zinc–iron ore was investigated. The ethyl xanthate and Aero 3418 collectors were used for lead flotation and Aero 3477 and amyl xanthate for zinc flotation. It was found that maximum lead grade could be achieved by using Aero 3418 as collector at pH 8. Also, iron and zinc recoveries and grades were increased in the lead concentrate at lower pH which caused zinc recovery reduction in the zinc concentrate and decrease the lead grade concentrate. Furthermore, the results showed that the maximum zinc grade and recovery of 42.9% and 76.7% were achieved at pH 6 in the presence of Aero 3477 as collector. For both collectors at pH 5, Zinc recovery was increased around 2–3%; however, the iron recovery was also increased at this pH which reduced the zinc concentrate quality. Finally, pH 8 and pH 6 were selected as optimum pH values for lead and zinc flotation circuits, respectively.

New approaches to crustal evolution studies and the origin of granitic rocks: what can the Lu-Hf and Re-Os isotope systems tell us?

1996 ◽  
Vol 87 (1-2) ◽  
pp. 339-352 ◽  
Author(s):  
Clark M. Johnson ◽  
Steven B. Shirey ◽  
Karin M. Barovich
Keyword(s):  
Continental Crust ◽  
Isotope Ratios ◽  
Granitic Rocks ◽  
Nd Isotope ◽  
Volcanic Arcs ◽  
Depleted Mantle ◽  
Os Isotopes ◽  
Isotope System ◽  
Os Isotope

ABSTRACT:The Lu-Hf and Re-Os isotope systems have been applied sparsely to elucidate the origin of granites, intracrustal processes and the evolution of the continental crust. The presence or absence of garnet as a residual phase during partial melting will strongly influence Lu/Hf partitioning, making the Lu–Hf isotope system exceptionally sensitive to evaluating the role of garnet during intracrustal differentiation processes. Mid-Proterozoic (1·1–1·5Ga ) ‘anorogenic’ granites from the western U.S.A. appear to have anomalously high εHf values, relative to their εNd values, compared with Precambrian orogenic granites from several continents. The Hf-Nd isotope variations for Precambrian orogenic granites are well explained by melting processes that are ultimately tied to garnet-bearing sources in the mantle or crust. Residual, garnet-bearing lower and middle crust will evolve to anomalously high εHf values over time and may be the most likely source for later ‘anorogenic’ magmas. When crustal and mantle rocks are viewed together in terms of Hf and Nd isotope compositions, a remarkable mass balance is apparent for at least the outer silicate earth where Precambrian orogenic continental crust is the balance to the high-εHf depleted mantle, and enriched lithospheric mantle is the balance to the low-εHf depleted mantle.Although the continental crust has been envisioned to have exceptionally high Re/Os ratios and very radiogenic Os isotope compositions, new data obtained on magnetite mineral separates suggest that some parts of the Precambrian continental crust are relatively Os-rich and non-radiogenic. It remains unclear how continental crust may obtain non-radiogenic Os isotope ratios, and these results have important implications for Re-Os isotope evolution models. In contrast, Phanerozoic batholiths and volcanic arcs that are built on young mafic lower crust may have exceptionally radiogenic Os isotope ratios. These results highlight the unique ability of Os isotopes to identify young mafic crustal components in orogenic magmas that are essentially undetectable using other isotope systems such as O, Sr, Nd and Pb.

scholarly journals The role of new stress protectors in the formation of production process of oat culture during cultivation in anthropogenically polluted areas

2020 ◽  
Vol 23 ◽  
pp. 03011
Author(s):  
Yuliya M. Andriyanova ◽  
Irina V. Sergeyeva ◽  
Nataliya N. Gusakova ◽  
Yuliya M. Mokhonko
Keyword(s):  
Plant Growth ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Negative Impact ◽  
Field Studies ◽  
Amylolytic Enzymes ◽  
Cereal Products ◽  
Oat Seeds ◽  
Lead Zinc

Stress protectors (adaptogens) are among the most important factors that regulate growth processes at all stages of plant development. This article presents results of field studies of the effect of new synthetic plant growth regulators of stress protectors (adaptogens) on the elements of productivity and yield of spring oats of the Skakun variety. The obtained results during the research showed that all the studied derivatives of peredazinones are adaptogens and they contribute to an increased productivity and increased yield of spring oats. We studied the effect of pre-sowing treatment of seeds with new synthetic plant growth regulators of stress protectors on the quality indicators of cereal production of Skakun oats (protein, starch and amylolytic enzymes content in the cereal). Pre-sowing treatment of oat seeds increases the amount of protein in the cereal up to 15%, starch – up to 25%, amylase – up to 20%. We proved the ability of stress protectors to minimize the negative impact of heavy metals (lead, zinc) on agrophytocenoses, which will make it possible to obtain environmentally friendly cereal products when cultivating oats in anthropogenically polluted areas of the Saratov Oblast.

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