Thoram, S., Sager, W. W., Gaastra, K., Tikoo, S. M., Carvallo, C., Avery, A., Del Gaudio, Arianna V., Huang, Y., Hoernle, K., Höfig, T. W., Bhutani, R., Buchs, D. M. ORCID: https://orcid.org/0000-0001-8866-8125, Class, C., Dai, Y., Valle, G. Dalla, Fielding, S., Han, S., Heaton, D. E., Homrighausen, S., Kubota, Y., Li, C.?F., Nelson, W. R., Petrou, E., Potter, K. E., Pujatti, S., Scholpp, J., Shervais, J. W., Tshiningayamwe, M., Wang, X. J. and Widdowson, M. 2023. Nature and origin of magnetic lineations within Valdivia Bank: Ocean plateau formation by complex seafloor spreading. Geophysical Research Letters 50 (13) , e2023GL103415. 10.1029/2023GL103415 |
Preview |
PDF
- Published Version
Available under License Creative Commons Attribution Non-commercial No Derivatives. Download (3MB) | Preview |
Abstract
Valdivia 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.
Item Type: | Article |
---|---|
Date Type: | Publication |
Status: | Published |
Schools: | Earth and Environmental Sciences |
Publisher: | Wiley Open Access |
ISSN: | 0094-8276 |
Date of First Compliant Deposit: | 31 July 2023 |
Date of Acceptance: | 11 May 2023 |
Last Modified: | 02 Aug 2023 16:52 |
URI: | https://orca.cardiff.ac.uk/id/eprint/161359 |
Actions (repository staff only)
Edit Item |