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Since global energy transition requires increasing amounts of metals, the understanding of the parameters favouring their extraction from a magma during natural degassing is crucial. [1] The preservation of the magmatic volatile phase in nature is very limited. Thus, to unambiguously reconstruct the parameters favourable for metal enrichment in this fluid phase, laboratory high-P and high-T experiments are essential. The analysis of experimental fluids represents a challenge. Most studies rely on mass balance calculations [2] or fluid trapping in quartz [3], which both have been discussed ambiguously [e.g., 4,5]. Additionally, the analysis of trapped fluids displays a challenge few LA-ICP-MS laboratories are set up for [6,7]. Here, we present data acquired using an alternative approach developed in the recent years [5,8] to directly analyse quenched fluids. The fluid is separated from the experimental capsule, treated and analysed by chromatography and ICPMS. In combination with standard EPMA/LA-ICP-MS analyses of the quenched melts, we determined trace element partition coefficients of base metals (Zn, Cu, Pb) as a function of melt composition (ASI=0.8-1.1), fluid salinity (0.3 and 2 mCl), fO2 (-0.8 and 2 ΔNNO), and pressure (2 and 4 kbar). These new partition coefficients will extend our understanding of metal transport during magmatic degassing significantly.

[1] Zelenski et al. 2021 GCA 295. 112-134 [2] Zajazc et al. 2012 GCA 91 140-159 [3] Zajazc et al. 2011 GCA 75. 2811-2827 [4] Kamenetsky and Danyushevsky 2005 Am Mineral. 90, 1674-1678 [5] Gion et al. 2022 Chem Geol 609. 121061 [6] Zajacz et al. 2008 GCA 72. 2169-2197 [7] Heinrich et al. 2003 GCA 67.18:3473-3496 [8] Iveson et al. 2019 Chem Geol 516. 18-41