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Chemical composition of magnetite and chlorite from the stringer zone of the Nudeh volcanogenic massive sulfide (VMS) deposit, Iran: geological implications

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Abstract

The southwest Sabzevar basin situated in the Sabzevar zone is considered to be an attractive metallogenic province in Iran that hosts both volcanogenic massive sulfide (VMS) and stratiform manganese deposits. The Nudeh Besshi-type VMS deposit is located in the Lower Late Cretaceous volcano-sedimentary sequence. The ore mineralization in this deposit is hosted in the alkali olivine basalt flow and tuffaceous silty sandstone rocks. The Nudeh VMS deposit consists of 2 million metric tons of Cu-Zn massive sulfide overlying a Cu-Fe-rich stringer. The massive sulfide orebody consists dominantly of pyrite, chalcopyrite, friedrichite, magnetite, and sphalerite, together with minor quartz, chlorite, and sericite. Chloritization, silicification, and sericitization are the main wall-rock alteration types; alteration intensity increases towards the stringer zone. Chloritized footwall rocks extend up to 20 m below the stringer zone. The quartz-bearing stringer veins also contain pyrite, chalcopyrite, magnetite, and bornite. Magnetite crystals from the stringer ores show variable contents of many elements, such as MgO (0.05 wt%), Al2O3 (0.63 wt%), TiO2 (0.07 wt%), V2O3 (0.045 wt%), SiO2 (0.65 wt%), CoO (0.10 wt%), NiO (0.009 wt%), ZnO (0.023 wt%), and CaO (0.03 wt%). The moderate to high V contents are interpreted to result from relatively reduced, seafloor hydrothermal activiy. Compositional variations of magnetite are possibly related to variations in oxygen fugacity, temperature, and water/rock interaction. Within the stringer zone, chlorite 2 (Chl-2) in the vein-veinlets and chlorite 1 (Chl-1) in the chloritized alkali olivine basalt rock are chemically indistinguishable, with 26.92–34.67 wt% FeO and 5.99–14.01 wt% MgO. Chlorite geothermometer studies indicate crystallization formation temperatures of 414 °C (Chl-1) and 303 °C (Chl-2), respectively.

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Acknowledgements

We thank Douglas Hall of University of New Brunswick (UNB) microscopy and microanalysis facility for the analytical work on the EPMA. We thank two anonymous reviewers and editors Xisheng Xu and Lutz Nasdala for their constructive comments. We are grateful for the funds provided by a research grant in 2012. DL was funded by a Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery grant.

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  1. Department of Geology, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, 14117-13116, Iran

    Sajjad Maghfouri & Ebrahim Rastad

  2. School of Geosciences, Shahrood University of Technology, Shahrood, 36199-95161, Iran

    Fardin Mousivand

  3. Department of Earth Sciences, University of New Brunswick, Fredericton, NB, 4400, Canada

    David R. Lentz

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  1. Sajjad Maghfouri
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Maghfouri, S., Mousivand, F., Rastad, E. et al. Chemical composition of magnetite and chlorite from the stringer zone of the Nudeh volcanogenic massive sulfide (VMS) deposit, Iran: geological implications. Miner Petrol 115, 241–256 (2021). https://doi.org/10.1007/s00710-021-00737-z

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