Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Fluid inclusion studies of barite disseminated in hydrothermal sediments of the Mohns Ridge

Marina D. Kravchishina
* ORCID logo ,
Vsevolod Yu. Prokofief
ORCID logo ,
Olga M. Dara
,
Boris V. Baranov
,
Alexey A. Klyuvitkin
ORCID logo ,
Karina S. Iakimova
,
Vladislav Yu. Kalgin
,
Alla Yu. Lein
Version 1 : Received: 6 July 2023 / Approved: 6 July 2023 / Online: 7 July 2023 (10:09:20 CEST)

A peer-reviewed article of this Preprint also exists.

Kravchishina, M.D.; Prokofiev, V.Y.; Dara, O.M.; Baranov, B.V.; Klyuvitkin, A.A.; Iakimova, K.S.; Kalgin, V.Y.; Lein, A.Y. Fluid Inclusion Studies of Barite Disseminated in Hydrothermal Sediments of the Mohns Ridge. Minerals 2023, 13, 1117. Kravchishina, M.D.; Prokofiev, V.Y.; Dara, O.M.; Baranov, B.V.; Klyuvitkin, A.A.; Iakimova, K.S.; Kalgin, V.Y.; Lein, A.Y. Fluid Inclusion Studies of Barite Disseminated in Hydrothermal Sediments of the Mohns Ridge. Minerals 2023, 13, 1117.

Abstract

This article discusses the results of fluid inclusions study in barite collected at the Jan Mayen vent field area (Troll Wall and Perle & Bruce) and Loki’s Castle vent field of the Mohns Ridge segment of the Arctic Mid-Ocean Ridge. Three mafic-hosted volcanogenic massive sulfide deposits were examined within the active vent fields that adequately correspond to geological settings of ultraslow-spreading ridges and PT-conditions. Hydrothermal sediments were investigated to determine the temperature and salinity of the fluids responsible for barite precipitation. The hydrothermal origin of the barite was confirmed by its morphology. Fluid inclusions are two-phase and homogenized into the liquid phase on heating at temperatures below 287ºC. The salt concentration in fluids trapped in inclusions is 2.6–4.4 wt.% NaCl eq. The crystallization temperatures varied from 276ºС to 119ºС and from 307ºС to 223ºС 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 hydrothermal systems and to expand our knowledge of the temperature and salinity of mineral fluids previously known from recent direct measurements during the cruises within the G.O. Sars research vessel. The fluid inclusions data obtained from barites emphasize the fluid features characteristic of volcanogenic massive sulfide deposits, the similarities and differences for the studied hydrothermal sites, and allow comparisons with similar products from other active hydrothermal systems.

Keywords

barite; fluid inclusion; hydrothermal vent field; hydrothermal fluid; mineralization; volcanogenic massive sulfide deposits; ultraslow-spreading ridge; Mohns Ridge; Arctic Mid-Ocean Ridge.

Subject

Environmental and Earth Sciences, Geochemistry and Petrology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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