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dc.contributor.authorTominaga, Masako
dc.contributor.authorBeinlich, Andreas Michael
dc.contributor.authorLima, Eduardo A.
dc.contributor.authorPruett, Paiden
dc.contributor.authorVento, Noah R.
dc.contributor.authorWeiss, Benjamin P.
dc.date.accessioned2024-08-08T07:33:17Z
dc.date.available2024-08-08T07:33:17Z
dc.date.created2023-06-21T10:52:34Z
dc.date.issued2023
dc.identifier.issn1525-2027
dc.identifier.urihttps://hdl.handle.net/11250/3145246
dc.description.abstractWe address in situ serpentinization and mineral carbonation processes in oceanic lithosphere using integrated field magnetic measurements, rock magnetic analyses, superconducting quantum interference device (SQUID) microscopy, microtextural observations, and energy dispersive spectroscopy phase mapping. A representative suite of ultramafic rock samples were collected, within the Atlin ophiolite, along a 100-m long transect across a continuous outcrop of mantle harzburgite with several alteration fronts: serpentinite, soapstone (magnesite + talc), and listvenite (magnesite + quartz). Strong correlations between changes in magnetic signal strengths and amount of alteration are shown with distinctive contrasts between serpentinite, transitional soapstone, and listvenite that are linked to the formation and breakdown of magnetite. While previous observations of the Linnajavri ultramafic complex indicated that the breakdown of magnetite occurred during listvenite formation from the precursor soapstone (Tominaga et al., 2017, https://doi.org/10.1038/s41467-017-01610-4), results from our study suggest that magnetite destabilization already occurred during the replacement of serpentinite by soapstone (i.e., at lower fluid CO2 concentrations). This difference is attributed to fracture-controlled flow of sulfur-bearing alteration fluid at Atlin, causing reductive magnetite dissolution in thin soapstone zones separating serpentinite from sulfide-mineralized listvenite. We argue that magnetite growth or breakdown in soapstone provides insight into the mode of fluid flow and the composition, which control the scale and extent of carbonation. This conclusion enables us to use magnetometry as a viable tool for monitoring the reaction progress from serpentinite to carbonate-bearing assemblages in space and time with a caution that the three-dimensionality of magnetic sources impacts the scalability of measurements.en_US
dc.language.isoengen_US
dc.publisherAGUen_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.no*
dc.titleHigh-Resolution Magnetic-Geochemical Mapping of the Serpentinized and Carbonated Atlin Ophiolite, British Columbia: Toward Establishing Magnetometry as a Monitoring Tool for In Situ Mineral Carbonationen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2023 The Author(s)en_US
dc.source.articlenumbere2022GC010730en_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1
dc.identifier.doi10.1029/2022GC010730
dc.identifier.cristin2156500
dc.source.journalGeochemistry Geophysics Geosystemsen_US
dc.identifier.citationGeochemistry Geophysics Geosystems. 2023, 24 (4), e2022GC010730.en_US
dc.source.volume24en_US
dc.source.issue4en_US


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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal