The paper reviews and compares the barite fndings in hydrothermal felds of the mid-oceanic ridges. The genetic signifcance of barite is considered for the Semenov hydrothermal sulfde cluster associated with an oceanic core complex (OCC) at 13°30′ N of the Mid-Atlantic Ridge. Massive sulfdes of the Semenov-1, -3, and -4 felds are enriched in barite (up to 20 vol. %) and therefore Ba (up to 4.12 wt. %). The presence of a signifcant amount of barite and a high Ba content of massive sulfdes of the OCC-related felds link their formation with E-MORBs. Magmartic contribution for the formation of massive sulfdes from some Semenov felds is supported by negative values of S isotopic composition of sulfdes associated with barite, the presence of magmatic gases (CO2 and SO2) in Raman spectra of fuid inclusions in barite and the results of physicochemical modeling, which indicate the formation of barite-sulfde assemblage upon the interaction of E-MORBs, seawater, and magmatic gas. The results of modeling of the system with felsic rocks show that oceanic plagiogranites from OCC structure could be an additional supplier of Ba.

Received 30.09.2024, revised 10.11.2024, accepted 15.11.2024

Keywords: E-MORB type basalt, barite, oceanic core complex, gabbroid, hydrothermal feld, Mid-Atlantic Ridge, mid-oceanic ridge, sulfdes, ultramafc rocks.

Funding. This work was supported by state contract no. 122031600292-6.

Acknowledgments. We are grateful to colleagues from JSC PMGE (Lomonosov, St. Petersburg, Russia) for the possibility of participation in the 30th cruise of R/V Professor Logatchev in 2007 and a reviewer for valueable comments allowing us to signifcantly improve the manuscript.

Confict of interest. The authors declare that they have no conficts of interest.

Author contribution. I.Yu. Melekestseva – conceptualization, vizualization, writing – original draft, writing – review & editing; G.A. Tret’yaklov – experimental work, writing – review & editing; V.E. Beltenev – vizualization, writing – review & editing. All the authors approved the fnal version of the manuscript prior to publication.

For citation: Melekestseva I.Yu., Tret’yakov G.A., Beltenev V.E. Enrichment of massive sulfdes from the Semenov hydrothermal cluster (Mid-Atlantic ridge) in barite: a result of E-MORB involvement and magmatic contribution. Минералогия, 2024, 10(4), 98–125. DOI: 10.35597/2313-545X-2024-10-4-5.

I.Yu. Melekestseva, South Urals Federal Research Center of Mineralogy and Geoecology UB RAS, Miass, Chelyabinsk region, 456317 Russia, melekestseva-irina@yandex.ru;

G.A. Tret’yakov,South Urals Federal Research Center of Mineralogy and Geoecology UB RAS, Miass, Chelyabinsk region, 456317 Russia;

V.E. Beltenev, VNIIOkeangeologiya, Angliysky pr. 1, St. Petersbrug, 190121 Russia

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