Abstract
The Gol-e-Gohar iron deposit (1.2 Gt @ 57.2% Fe, 1.85% S, 0.16% P) occurs in Ediacaran banded magnetite-hematite-schist. Mirzaei et al. (2018) hypothesized that post-metamorphic Fe-rich fluids linked to large unknown magmatic bodies were the main source of magmatic-hydrothermal and skarn magnetite mineralization during Middle Mesozoic. However, the absence of granodiorite-related magnesian skarn halo and hydrothermal feeder zone on the geological map-cross section is inconsistent with their hypothesis. New evidence, including U-Pb zircon age dating (605–544 Ma), geological map (Fig. 1) and sulfur isotopic signatures of pyrite show that the synchronous submarine ultramafic-mafic volcanism, sedimentation and iron oxide mineralization were formed during Ediacaran time. In this regard, the presence of metajaspilites, exoclastic dropstones in ore-host rocks and the magnetite position on discrimination diagrams display an Ediacaran type of metamorphosed banded iron formations (BIFs). Heavy mineral sampling in drainage patterns crosscutting the metamorphosed Gol-e-Gohar complex may indicate further concealed BIFs in the Sanandaj-Sirjan Zone.
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