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Sulfide breccias from the Semenov-3 hydrothermal field, Mid-Atlantic Ridge: Authigenic mineral formation and trace element pattern

Citation

Melekestseva, I and Maslennikov, VV and Safina, NP and Nimis, P and Maslennikova, S and Beltenev, V and Rozhdestvenskaya, I and Danyushevsky, L and Large, R and Artemyev, D and Kotlyarov, V and Toffolo, L, Sulfide breccias from the Semenov-3 hydrothermal field, Mid-Atlantic Ridge: Authigenic mineral formation and trace element pattern, Minerals, 8, (8) Article 321. ISSN 2075-163X (2018) [Refereed Article]


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Copyright 2018 the authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.3390/min8080321

Abstract

The aim of this paper is the investigation of the role of diagenesis in the transformation of clastic sulfide sediments such as sulfide breccias from the Semenov-3 hydrothermal field (Mid-Atlantic Ridge). The breccias are composed of marcasite–pyrite clasts enclosed in a barite–sulfide–quartz matrix. Primary hydrothermal sulfides occur as colloform, fine-crystalline, porous and radial marcasite–pyrite clasts with inclusions or individual clasts of chalcopyrite, sphalerite, pyrrhotite, bornite, barite and rock-forming minerals. Diagenetic processes are responsible for the formation of more diverse authigenic mineralization including framboidal, ovoidal and nodular pyrite, coarse-crystalline pyrite and marcasite, anhedral and reniform chalcopyrite, inclusions of HgS phase and pyrrhotite–sphalerite–chalcopyrite aggregates in coarse-crystalline pyrite, zoned bornite–chalcopyrite grains, specular and globular hematite, tabular barite and quartz. The early diagenetic ovoid pyrite is enriched in most trace elements in contrast to late diagenetic varieties. Authigenic lower-temperature chalcopyrite is depleted in trace elements relative to high-temperature hydrothermal ones. Trace elements have different modes of occurrence: Se is hosted in pyrite and chalcopyrite; Tl is related to sphalerite and galena nanoinclusions; Au is associated with galena; As in pyrite is lattice-bound, whereas in chalcopyrite it is related to tetrahedrite–tennantite nanoinclusions; Cd in pyrite is hosted in sphalerite inclusions; Cd in chalcopyrite forms its own mineral; Co and Ni are hosted in chalcopyrite.

Item Details

Item Type:Refereed Article
Keywords:authigenesis, diagenesis, LA-ICP-MS, sulfide hydrothermal fields, Mid-Atlantic Ridge, sulfide breccias, trace elements
Research Division:Earth Sciences
Research Group:Geology
Research Field:Resource geoscience
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Danyushevsky, L (Professor Leonid Danyushevsky)
UTAS Author:Large, R (Professor Ross Large)
ID Code:144717
Year Published:2018
Funding Support:Australian Research Council (CE0561595)
Web of Science® Times Cited:6
Deposited By:CODES ARC
Deposited On:2021-06-06
Last Modified:2021-08-10
Downloads:0

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