Mercury isotope evidence for the importance of recycled fluids in collisional ore systems.

ABSTRACT: The sources of fluids and metals in porphyry systems of continental-collision settings are poorly constrained. Mercury isotopes display unique mass-independent fractionation (expressed as Δ¹⁹⁹Hg) and may provide important constraints on metal and volatile sources given that Hg is a highly volatile metal. Here, we report Hg isotope data on ore-forming porphyries, barren magmatic rocks, and mantle-derived mafic magmas from southern Tibet. The fertile porphyries and coeval mafic magmas display mainly positive Δ¹⁹⁹Hg values (up to +0.25 per mil), while Δ¹⁹⁹Hg values in barren magmatic rocks and mafic magmas are largely negative (-0.54 to 0.00 per mil). The positive Δ¹⁹⁹Hg values observed here are consistent with seawater and marine sediments, suggest

SUBMITTER: Xu B 

PROVIDER: S-EPMC11338221 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature