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Iron isotopes constrain sub-seafloor hydrothermal processes at the Trans-Atlantic Geotraverse (TAG) active sulfide mound
Swedish Museum of Natural History, Department of Geology.ORCID iD: 0000-0003-2377-8272
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2022 (English)In: Communications Earth & Environment, E-ISSN 2662-4435, Vol. 3, no 1, article id 193Article in journal (Refereed) Published
Abstract [en]

Sub-seafloor hydrothermal processes along volcanically active plate boundaries are integral to the formation of seafloor massive sulfide deposits and to oceanic iron cycling, yet the nature of their relationship is poorly understood. Here we apply iron isotope analysis to sulfide minerals from the Trans-Atlantic Geotraverse (TAG) mound and underlying stockwork, 26°N Mid-Atlantic Ridge, to trace hydrothermal processes inside an actively-forming sulfide deposit in a sediment-free mid-ocean ridge setting. We show that data for recently formed chalcopyrite imply hydrothermal fluid–mound interactions cause small negative shifts (<−0.1‰) to the δ56Fe signature of dissolved iron released from TAG into the North Atlantic Ocean. Texturally distinct types of pyrite, in turn, preserve a δ56Fe range from −1.27 to +0.56‰ that reflects contrasting precipitation mechanisms (hydrothermal fluid–seawater mixing vs. conductive cooling) and variable degrees of progressive hydrothermal maturation during the >20 kyr evolution of the TAG complex. The identified processes may explain iron isotope variations found in fossil onshore sulfide deposits.

Place, publisher, year, edition, pages
2022. Vol. 3, no 1, article id 193
National Category
Geochemistry Environmental Sciences Geology Oceanography, Hydrology and Water Resources
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-5122DOI: 10.1038/s43247-022-00518-2OAI: oai:DiVA.org:nrm-5122DiVA, id: diva2:1720903
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Swedish Research Council, 2020-03789Available from: 2022-12-20 Created: 2022-12-20 Last updated: 2022-12-20Bibliographically approved

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Sahlström, FredrikTroll, Valentin R.Kooijman, EllenZheng, Xin-Yuan
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