Mercury isotopes as a useful tracer of magma sources: An example from the Daocheng-Cuojiaoma batholith, eastern Tibetan Plateau

Paleo‐Pacific Plate Subduction and Basement Mobilization Triggered Large‐Scale Formation of Mesozoic Gold Deposits in the Northern Margin of the North China Craton

“…The samples of gold ore and pyrite show ∆ 199 Hg ranging from −0.28‰ to 0.34‰ (Table 2 and Figure 3b). All the samples studied show a linear correlation between ∆ 199 Hg and ∆ 201 Hg (Figure 4), with a ∆ 199 Hg/∆ 201 Hg ratio of 1.06 ± 0.13 (2SD), consistent with that observed during Hg(II) photochemical reduction on Earth's surface (∆ 199 Hg/∆ 201 Hg = 1.0 to 1.3; Bergquist & Blum, 2007;Zheng & Hintelmann, 2009) and in basalts and granites (∆ 199 Hg/∆ 201 Hg ∼ 1; Deng, Gou, et al, 2022;Moynier et al, 2020Moynier et al, , 2021Tian et al, 2022;X. Y. Wang et al, 2021;Yin et al, 2022).…”

“…A variety of biological, chemical, and physical processes can trigger Hg‐MDF (Blum et al., 2014); however, Hg‐MIF mainly occurs during photochemical reactions with limited interference from other processes (Bergquist & Blum, 2007). Magmatic, metamorphic, and hydrothermal processes do not induce Hg‐MIF, allowing the use of Hg‐MIF signals for tracing metal sources in geological reservoirs (Chen et al., 2022; Deng et al., 2021; Deng, Hong, et al., 2022; Tian et al., 2022; Yin et al., 2022). The primitive mantle has near‐zero ∆ 199 Hg values (0.00‰ ± 0.10‰, Moynier et al., 2021), whereas photochemical processes on Earth's surface result in negative and positive ∆ 199 Hg values in terrestrial (soil and vegetation) and oceanic (seawater and marine sediments) reservoirs, respectively (Blum et al., 2014).…”