Nature and Origin of Magnetic Lineations Within Valdivia Bank: Ocean Plateau Formation by Complex Seafloor Spreading

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dc.citation.articleNumbere2023GL103415
dc.citation.issueNumber13
dc.citation.journalTitleGeophysical Research Letters
dc.citation.volumeNumber50
dc.contributor.authorThoram, S.
dc.contributor.authorSager, W. W.
dc.contributor.authorGaastra, K.
dc.contributor.authorTikoo, S. M.
dc.contributor.authorCarvallo, C.
dc.contributor.authorAvery, A.
dc.contributor.authorDel Gaudio, Arianna V.
dc.contributor.authorHuang, Y.
dc.contributor.authorHoernle, K.
dc.contributor.authorHöfig, T. W.
dc.contributor.authorBhutani, R.
dc.contributor.authorBuchs, D. M.
dc.contributor.authorClass, C.
dc.contributor.authorDai, Y.
dc.contributor.authorValle, G. Dalla
dc.contributor.authorFielding, S.
dc.contributor.authorHan, S.
dc.contributor.authorHeaton, D. E.
dc.contributor.authorHomrighausen, S.
dc.contributor.authorKubota, Y.
dc.contributor.authorLi, C.-F.
dc.contributor.authorNelson, W. R.
dc.contributor.authorPetrou, E.
dc.contributor.authorPotter, K. E.
dc.contributor.authorPujatti, S.
dc.contributor.authorScholpp, J.
dc.contributor.authorShervais, J. W.
dc.contributor.authorTshiningayamwe, M.
dc.contributor.authorWang, X. J.
dc.contributor.authorWiddowson, M.
dc.date.accessioned2023-08-01T17:29:40Z
dc.date.available2023-08-01T17:29:40Z
dc.date.issued2023
dc.description.abstractValdivia Bank (VB) is a Late Cretaceous oceanic plateau formed by volcanism from the Tristan-Gough hotspot at the Mid-Atlantic Ridge (MAR). To better understand its origin and evolution, magnetic data were used to generate a magnetic anomaly grid, which was inverted to determine crustal magnetization. The magnetization model reveals quasi-linear polarity zones crossing the plateau and following expected MAR paleo-locations, implying formation by seafloor spreading over ∼4 Myr during the formation of anomalies C34n-C33r. Paleomagnetism and biostratigraphy data from International Ocean Discovery Program Expedition 391 confirm the magnetic interpretation. Anomaly C33r is split into two negative bands, likely by a westward ridge jump. One of these negative anomalies coincides with deep rift valleys, indicating their age and mechanism of formation. These findings imply that VB originated by seafloor spreading-type volcanism during a plate reorganization, not from a vertical stack of lava flows as expected for a large volcano.
dc.identifier.citationThoram, S., Sager, W. W., Gaastra, K., et al.. "Nature and Origin of Magnetic Lineations Within Valdivia Bank: Ocean Plateau Formation by Complex Seafloor Spreading." <i>Geophysical Research Letters,</i> 50, no. 13 (2023) Wiley: https://doi.org/10.1029/2023GL103415.
dc.identifier.digital2023-Thoram
dc.identifier.doihttps://doi.org/10.1029/2023GL103415
dc.identifier.urihttps://hdl.handle.net/1911/115037
dc.language.isoeng
dc.publisherWiley
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives (CC BY-NC-ND) license.  Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleNature and Origin of Magnetic Lineations Within Valdivia Bank: Ocean Plateau Formation by Complex Seafloor Spreading
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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