Effect of wall rocks on the efficiency of hydrothermal ore-forming processes

Борисов, М. В.; Shvarov, Yu. V.

doi:10.1134/s0016702910090077

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…The reaction brings about considerable changes in the solution pH in correlation with the rock's acidbase characteristics. More complicated scenarios of events were also studied, in particular, those in which the temperature in the system changes vertically [6]. The studies involved a "granite-fluid" system made up of 15 independent components.…”

Section: Figure 1 Correlation Between Salt Concentration and Homogeni...mentioning

confidence: 99%

Thermal Waters Circulation During the Formation of Ore Deposits

Гордиенко¹,

Gordienko²

2021

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The paper analyzes processes leading to the formation of gold-bearing sulphide deposits. The study was based on the data available for the territory of Ukraine and other regions. The deposits in question are shown to be associated with postgeosynclinal activation as postulated by concepts of the advection-polymorphism hypothesis. The nature of ore-bearing fluids is analyzed. Even on the ocean bottom helium isotopy points to the presence of mantle components in the fluid. Metamorphogenic and magmatic fluids are obviously involved in the process. An abnormally fast growth of permeability in fault zones during the activation period is shown to have contributed to the formation of deposits. The existence of metalliferous and barren phases of hydrothermal activity is explained. Thermal models of deposits are constructed and diagnostic criteria for their identification determined. The main features of the deposits are associated with faults through which mineralized deep waters circulate. In young deposits, these are: 1. Increased content of metals in soil and plants. 2. Intense heat flow anomalies. 3. High helium isotope ratios, indicating an active process in the Earth's mantle. 4. Zones of high electrical conductivity in the crust and upper mantle. 5. Near the faults, positive anomalies of the gravity field are formed, associated with the transformation of rocks under the influence of heating. The search for gold-bearing sulphide deposits should be continued, considering that the reserves already explored in Ukraine guarantee commercially viable production of over 10 tons of gold per year.

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Section: Figure 1 Correlation Between Salt Concentration and Homogeni...mentioning

confidence: 99%

Thermal Waters Circulation During the Formation of Ore Deposits

Гордиенко¹,

Gordienko²

2021

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“…However no one of the proposed equations describes experimental results well in a wide range of compositions, temperatures and fO 2 [1]. Moreover most of them did not consider acid melts in a wide range of temperatures and oxygen fugacities [2].…”

Section: Introductionmentioning

confidence: 99%

Study of oxygen fugacity influence on redox state of iron in granitoidic melts

Volovetsky¹,

Rusakov²,

Луканин³

et al. 2010

J. Phys.: Conf. Ser.

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Abstract.A series of experiments has been carried out on two granitoid melt compositions under the wide range of oxygen fugacities. Room temperature 57 Fe Mössbauer spectroscopy has been used to study the structural and oxidation state of Fe in granitoid composition glasses. Samples were produced in a series of melting experiments at temperatures from 1120 to 1420 ºC and oxygen fugacities from 10 -0.7 (air) to 10 -12 (CCO buffer) bars. The analysis has shown that Fe 3+ /Fe 2+ ratio in the melt considerably decreases with fO 2 decreasing and/or temperature increasing. Dependence of Fe 3+ /Fe 2+ ratio on fO 2 is linear in logarithmic scale with slope 0.18-0.24. Ferrous iron occupies octahedral and probably five-fold positions and is regarded as a network-modifier. Ferric iron coordination depends on iron redox state. Its structural role changes from network-modifier to network-former.

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Acid-base properties of cooling magmatic fluid and D.S. Korzhinskii’s “acidic wave” mechanism: Physicochemical simulation results

Khudolozhkin

Kuchma

2015

Petrology

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Data on the component composition and acid-base properties of cooling fluid in the systems H 2 O-CO 2 , H 2 O-NaCl, and H 2 O-rock forming minerals, which were derived by minimizing the Gibbs free energy, and the evaluated contributions of major fluid components to its acid-base properties suggest that the main reason for the inversion of acid-base properties of magmatic fluids in the fluid-granite system is the opposite tendencies in the changes of the dissociation constants of acidic and basic fluid components in the course of fluid cooling.

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Effect of wall rocks on the efficiency of hydrothermal ore-forming processes

Cited by 3 publications

References 2 publications

Thermal Waters Circulation During the Formation of Ore Deposits

Thermal Waters Circulation During the Formation of Ore Deposits

Study of oxygen fugacity influence on redox state of iron in granitoidic melts

Acid-base properties of cooling magmatic fluid and D.S. Korzhinskii’s “acidic wave” mechanism: Physicochemical simulation results

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