Inter-phase Partitioning of Pb and Zn in Granitoid Fluid-Magmatic Systems: Experimental Study

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Experimental studies of the partitioning of Pb and Zn between the fluid and the granite melt have shown that relatively low pressure of 100 MPa and temperature of 750 °C and acidic chloride composition of the (0.1N HCl + 1N NaCl) fluid will promote the best extraction these metals from the melt. Herein the fluid/meltDPb,Zn partition coefficients are ≥10. In systems with acidic chloride fluids these coefficients increase proportionally to the square of the fluid chloride concentration: fluid/meltDPb ≈ (7 ± 1.6) × fluidCCl2 and fluid/meltDZn ≈ (5.7 ± 2.0) × fluidCCl2, which allows us to assume pure chloride complexes in these systems for Pb+2 and Zn+2. Increases in temperature and, in particular, pressure significantly reduce the partition coefficients of these metals. At the conditions of two-phase fluid of H2O–NaCl composition there is a significant (~5–7 times) accumulation of Pb and Zn in the dense brine (water–salt) fluid phase relatively low-density vapor (essentially aqueous) fluid phase. The addition of CO2 to the fluid increases the concentration of these metals in the brine phase, and for Pb it is much higher than for Zn. In the process of crystallization of granite melt at pressure of about 500 MPa polymetals do not pass into the separated (nascent) fluid. Herein Pb is concentrated in crystallizing feldspars (Olg and Kfs), and Zn remains in the residual melt. With decreasing pressure (up to about 250 MPa) the fluid is visibly enriched with polymetals, and the content of Pb and Zn become almost the same in the fluid and in feldspars, except for the sharply lower content of Zn in Ab and Ancl. At change of composition of melt from granite to andesite and basalt the fluid/meltDPb,Zn partition coefficients sharply decrease (on 1.5–2 orders of magnitude). In this case positive linear correlation dependences between the fluid/meltDPb,Zn coefficients and silica content in melt are established (RPb = 0.95, and RZn = 0.93).


Geochemistry Solubility Partitioning Lead Zinc Fluids Magmatic melts Granites Experiment 



The work was carried out with the financial support of RFBR grant № 18-05-01001-a and project of IEM RAS № AAAA-A18-118020590151-3.


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Authors and Affiliations

  1. 1.D.S. Korzhinskii Institute of Experimental MineralogyRussian Academy of SciencesChernogolovka, Moscow RegionRussia

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