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Abstract <p>The paper reviews and compares barite findings in the mid-oceanic ridge hydrothermal sulfide fields (HSFs). The genetic significance of barite is shown for the Semenov hydrothermal sulfide cluster, which is associated with an oceanic core complex (OCC) at 13°30′ N of the Mid-Atlantic Ridge. Massive sulfides of the Semenov-1, -3, and -4 HSFs are enriched in barite (up to 20 vol %) and therefore Ba (up to 4.12 wt %). The presence of a significant amount of barite and the high Ba content of massive sulfides of the OCC-related HSFs link them with enriched mid-oceanic ridge basalts (E-MORBs), as well as indicate magmatic contribution to the mineral formation. In the Semenov massive sulfides, this is also evident from negative S isotopic composition of sulfides associated with barite, the presence of magmatic gases (CO<sub>2</sub> and SO<sub>2</sub>) in Raman spectra of fluid inclusions in barite, and results of physicochemical modeling, which support the formation of barite–sulfide assemblage after the interaction of E-MORBs, seawater, and magmatic gas. The modeling results of the system with felsic rocks show that oceanic plagiogranites from the OCC structure may be an additional Ba supplier.</p>

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Enrichment of Massive Sulfides from the Semenov Hydrothermal Cluster (Mid-Atlantic Ridge) in Barite: a Result of E-MORB Involvement and Magmatic Contribution

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • I. Yu. Melekestseva,
  • G. A. Tret’yakov,
  • V. E. Beltenev

摘要

Abstract

The paper reviews and compares barite findings in the mid-oceanic ridge hydrothermal sulfide fields (HSFs). The genetic significance of barite is shown for the Semenov hydrothermal sulfide cluster, which is associated with an oceanic core complex (OCC) at 13°30′ N of the Mid-Atlantic Ridge. Massive sulfides of the Semenov-1, -3, and -4 HSFs are enriched in barite (up to 20 vol %) and therefore Ba (up to 4.12 wt %). The presence of a significant amount of barite and the high Ba content of massive sulfides of the OCC-related HSFs link them with enriched mid-oceanic ridge basalts (E-MORBs), as well as indicate magmatic contribution to the mineral formation. In the Semenov massive sulfides, this is also evident from negative S isotopic composition of sulfides associated with barite, the presence of magmatic gases (CO2 and SO2) in Raman spectra of fluid inclusions in barite, and results of physicochemical modeling, which support the formation of barite–sulfide assemblage after the interaction of E-MORBs, seawater, and magmatic gas. The modeling results of the system with felsic rocks show that oceanic plagiogranites from the OCC structure may be an additional Ba supplier.