ENRICHMENT OF MASSIVE SULFIDES FROM THE SEMENOV HYDROTHERMAL CLUSTER (MID-ATLANTIC RIDGE) IN BARITE: A RESULT OF E-MORB INVOLVEMENT AND MAGMATIC CONTRIBUTION
The paper reviews and compares the barite findings in hydrothermal fields of the midoceanic ridges. The genetic significance of barite is considered for the Semenov hydrothermal sulfide cluster associated with an oceanic core complex (OCC) at 13°30′ N of the Mid-Atlantic Ridge. Massive sulfides of t...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
South Urals Federal Research Center of Mineralogy and Geoecology UB RAS
2024-12-01
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| Series: | Минералогия |
| Subjects: | |
| Online Access: | https://journal.mineralogy.ru/wp-content/uploads/2025/01/2024_10_4_5.pdf |
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| Summary: | The paper reviews and compares the barite findings in hydrothermal fields of the midoceanic ridges. The genetic significance of barite is considered for the Semenov hydrothermal sulfide cluster 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 fields 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 a high Ba content of massive sulfides of the OCC-related fields link their formation with E-MORBs. Magmartic contribution for the formation of massive sulfides from some Semenov fields is supported by negative values of 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 the results of physicochemical modeling, which indicate the formation of barite-sulfide 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. |
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| ISSN: | 2313-545X 2782-2044 |