Fluid Inclusion Studies of Barite Disseminated in Hydrothermal Sediments of the Mohns Ridgeстатья
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Дата последнего поиска статьи во внешних источниках: 20 февраля 2024 г.
Аннотация:This article discusses the results of a fluid inclusion studies in barite collected at the JanMayen vent field area (Troll Wall and Perle and Bruse) and Loki’s Castle vent field on the Mohns Ridgesegment of the Arctic Mid-Ocean Ridge. Three mafic-hosted volcanogenic massive sulfide depositswere examined within the active vent fields that adequately correspond to the geological settingsof ultraslow-spreading ridges and P–T conditions. Hydrothermal sediments were investigatedto determine the temperature and salinity of the fluids responsible for barite precipitation. Thehydrothermal origin of the barite was confirmed by its morphology. Fluid inclusions are two-phaseand homogenize into the liquid phase on heating at temperatures below 287 ◦C. The salt concentrationin fluids trapped in inclusions is 2.6–4.4 wt.% NaCl eq. The crystallization temperatures varied from276 ◦C to 119 ◦C and from 307 ◦C to 223 ◦C for the Jan Mayen and Loki’s Castle vent fields, respectively.The data obtained allowed us to confirm evidence of fluid phase separation in the hydrothermalsystems and to expand our knowledge of the temperature and salinity of mineral fluids previouslyknown from recent direct measurements during the cruises within the G.O. Sars research vessel. Thefluid inclusions data obtained from barites emphasize the fluid features characteristic of volcanogenicmassive sulfide deposits, the similarities and differences among the studied hydrothermal sites andallow comparisons with similar products from other active hydrothermal systems.