TY - JOUR

T1 - The behavior of ore elements in oxidized heterophase chloride and carbonate-chloride-sulfate fluids of porphyry Cu-Mo(Au) deposits (from experimental data)

AU - Borovikov, A. A.

AU - Bul'bak, T. A.

AU - Borisenko, A. S.

AU - Ragozin, A. L.

AU - Palesskii, S. V.

PY - 2015/3/1

Y1 - 2015/3/1

N2 - The spatial coexistence and synchronous formation of magmatogene porphyry Cu-Mo mineralization and epithermal gold mineralization are due to the genetic relationship between their formation processes. This relationship might be due to the generation of metal-bearing fluids of different geochemical compositions by the porphyry ore-magmatic system, which then participate in the formation of magmatogene porphyry Cu-Mo(Au) and associated epithermal gold deposits. Synthesis of fluid inclusions in quartz was performed for experimental study of the behavior of Cu, Mo, W, Sn, Au, As, Sb, Te, Ag, and Bi in heterophase fluids similar in composition and aggregate state to natural ore-forming fluids of porphyry Cu-Mo(Au) deposits. We have established that at 700 °C, a pressure decrease from 117 to 106 MPa leads to a significant enrichment of the gas phase of heterophase chloride fluid with Au, As, Sb, and Bi. The heterophase state of carbonate-chloride-sulfate fluids is observed at 600 °C and 100-90 MPa. It characterizes the highly concentrated liquid carbonate-sulfide phase-liquid chloride phase-low-density gas phase equilibrium. A decrease in the pressure of heterophase carbonate-chloride-sulfate fluid leads to a noticeable enrichment of its chloride phase with Cu, Mo, Fe, W, Ag, Sn, Sb, and Zn relative to the carbonate-sulfate phase. The processes of redistribution of ore elements between the phases of heterophase fluids can be considered a model of generation of metal-bearing chloride fluids, which occurs in nature during the formation of porphyry Cu-Mo(Au) deposits, as well as a model of generation of gas fluids supplying Au, Te, As, and other ore elements to the place of formation of epithermal Au-Cu and Au-Ag mineralization.

AB - The spatial coexistence and synchronous formation of magmatogene porphyry Cu-Mo mineralization and epithermal gold mineralization are due to the genetic relationship between their formation processes. This relationship might be due to the generation of metal-bearing fluids of different geochemical compositions by the porphyry ore-magmatic system, which then participate in the formation of magmatogene porphyry Cu-Mo(Au) and associated epithermal gold deposits. Synthesis of fluid inclusions in quartz was performed for experimental study of the behavior of Cu, Mo, W, Sn, Au, As, Sb, Te, Ag, and Bi in heterophase fluids similar in composition and aggregate state to natural ore-forming fluids of porphyry Cu-Mo(Au) deposits. We have established that at 700 °C, a pressure decrease from 117 to 106 MPa leads to a significant enrichment of the gas phase of heterophase chloride fluid with Au, As, Sb, and Bi. The heterophase state of carbonate-chloride-sulfate fluids is observed at 600 °C and 100-90 MPa. It characterizes the highly concentrated liquid carbonate-sulfide phase-liquid chloride phase-low-density gas phase equilibrium. A decrease in the pressure of heterophase carbonate-chloride-sulfate fluid leads to a noticeable enrichment of its chloride phase with Cu, Mo, Fe, W, Ag, Sn, Sb, and Zn relative to the carbonate-sulfate phase. The processes of redistribution of ore elements between the phases of heterophase fluids can be considered a model of generation of metal-bearing chloride fluids, which occurs in nature during the formation of porphyry Cu-Mo(Au) deposits, as well as a model of generation of gas fluids supplying Au, Te, As, and other ore elements to the place of formation of epithermal Au-Cu and Au-Ag mineralization.

KW - Ore deposits

KW - Ore formation

KW - Synthetic fluid inclusions

UR - http://www.scopus.com/inward/record.url?scp=84924694316&partnerID=8YFLogxK

U2 - 10.1016/j.rgg.2015.02.005

DO - 10.1016/j.rgg.2015.02.005

M3 - Article

AN - SCOPUS:84924694316

VL - 56

SP - 435

EP - 445

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 3

ER -