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- W2893955367 abstract "Genesis of magnetite from Gol-Gohar iron deposit (GGID) of southeastern Iran is studied with reference to elemental composition. More than 1.2 billion tonnes of magnetite ore at 58% total Fe is hosted by greenschist- to amphibolite-facies metapelites and magnesian marbles. The GGID occurs in the mainly-metamorphic terrain of Sanandaj-Sirjan geological province, with continental-margin tectonic setting. The magnetite-bearing ore is divided into two distinct types of massive and banded; the latter hosted mainly by magnesian marbles. Both subtypes of the ore bodies are associated with mineral assemblages consisting of calcite, dolomite, forsterite, tremolite-actinolite, talc, serpentine, and chlorite. The ore minerals in both subtypes are magnetite, hematite with minor amounts of pyrite, pyrrhotite, and chalcopyrite. Concentrations of temperature-dependent elements, Ti, Al, and Ga in the two subtypes would suggest that temperature of formation was higher for the massive magnetite (with Ti = 626 ppm, Al = 69 ppm and Ga = 56 ppm, on average) and relatively lower for the banded magnetite (with Ti = 60 ppm, Al = 62 ppm and Ga = 4 ppm, on average). The multi-element diagrams, for massive magnetite, show patterns closer to those of magmatic-hydrothermel iron deposits (Kiruna-type), whereas, patterns of the banded magnetite match better with those of skarn deposits, particularly the magnesian skarns. Average concentrations of V (>1000 ppm) and Cr (∼4 ppm) of the massive subtype fall within the range of those of Kiruna-type deposits, and the in average lower concentrations of V (∼10 ppm) and Cr (∼1 ppm) of the banded magnetite match the values of skarn deposits. The average V content of the massive magnetite (1342 ppm) is consistent with the global range of magmatic-hydrothermal magnetite (up to 3880 ppm), but different from global values of purely-magmatic magnetites (up to 6600 ppm). The banded magnetites contain 0.21–25 ppm V, which is only consistent with the lowest values of hydrothermal magnetites. We contend that the massive magnetite was formed by magmatic-hydrothermal processes (i.e., Kiruna type) and the banded magnetites were generated via metasomatic reactions between iron-rich residual magmatic fluids and the magnesian carbonate host rocks (i.e., skarn type)." @default.
- W2893955367 created "2018-10-05" @default.
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- W2893955367 date "2018-11-01" @default.
- W2893955367 modified "2023-09-23" @default.
- W2893955367 title "Two-tiered magmatic-hydrothermal and skarn origin of magnetite from Gol-Gohar iron ore deposit of SE Iran: In-situ LA–ICP-MS analyses" @default.
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- W2893955367 doi "https://doi.org/10.1016/j.oregeorev.2018.09.025" @default.
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