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Trace element geochemistry of sulfides from the Ashadze-2 hydrothermal field (12° 58' N, Mid-Atlantic Ridge): Influence of host rocks, formation conditions or seawater?

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Melekestseva, I, Maslennikov, V, Tret'yakov, G, Maslennikova, S, Danyushevsky, L ORCID: 0000-0003-4050-6850, Kotlyarov, V, Large, L, Beltenev, V and Khvorov, P 2020 , 'Trace element geochemistry of sulfides from the Ashadze-2 hydrothermal field (12° 58' N, Mid-Atlantic Ridge): Influence of host rocks, formation conditions or seawater?' , Minerals, vol. 10, no. 9 , pp. 1-29 , doi: 10.3390/MIN10090743.

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Abstract

The trace element (TS) composition of isocubanite, chalcopyrite, pyrite, bornite, and covellite from oxidized Cu-rich massive sulfides of the Ashadze-2 hydrothermal field (12° 58′ N, Mid-Atlantic Ridge) is studied using LA-ICP-MS. The understanding of TE behavior, which depends on the formation conditions and the mode of TE occurrence, in sulfides is important, since they are potential sources for byproduct TEs. Isocubanite has the highest Co contents). Chalcopyrite concentrates most Au. Bornite has the highest amounts of Se, Sn, and Te. Crystalline pyrite is a main carrier of Mn. Covellite after isocubanite is a host to the highest Sr, Ag, and Bi contents. Covellite after pyrite accumulates V, Ga and In. The isocubanite+chalcopyrite aggregates in altered gabrro contain the highest amounts of Ni, Zn, As, Mo, Cd, Sb (166 ppm), Tl, and Pb. The trace element geochemistry of sulfides is mainly controlled by local formation conditions. Submarine oxidation results in the formation of covellite and its enrichment in most trace elements relative to primary sulfides. This is a result of incorporation of seawater-derived elements and seawater-affected dissolution of accessory minerals (native gold, galena and clausthalite).

Item Type: Article
Authors/Creators:Melekestseva, I and Maslennikov, V and Tret'yakov, G and Maslennikova, S and Danyushevsky, L and Kotlyarov, V and Large, L and Beltenev, V and Khvorov, P
Keywords: Ashadze-2 hydrothermal field, copper sulfides, formation conditions, LA-ICP-MS, Mid-Atlantic Ridge, mode of occurrence, physico-chemical modeling, trace elements
Journal or Publication Title: Minerals
Publisher: MDPI
ISSN: 2075-163X
DOI / ID Number: 10.3390/MIN10090743
Copyright Information:

Copyright 2020 the authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

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