Anthony A.P. Koppers
IODP Expedition 330 : drilling the Louisville Seamount Trail in the SW Pacific
Koppers, Anthony A.P.; Yamazaki, Toshitsugu; Geldmacher, Jörg; Anderson, Louise; Beier, Christoph; Buchs, David M.; Chen, Li Hui; Cohen, Benjamin E.; Deschamps, Fabien; Dorais, Michael J.; Ebuna, Daniel; Ehmann, Sebastian; Fitton, J. Godfrey; Fulton, Patrick M.; Ganbat, Erdenesaikhan; Gee, Jeffrey S.; Hamelin, Cedric; Hanyu, Takeshi; Hoshi, Hiroyuki; Kalnins, Lara; Kell, Johnathon; Machida, Shiki; Mahoney, John J.; Moriya, Kazuyoshi; Nichols, Alexander R.L.; Pressling, Nicola; Rausch, Svenja; Sano, Shin Ichi; Sylvan, Jason B.; Williams, Rebecca
Authors
Toshitsugu Yamazaki
Jörg Geldmacher
Louise Anderson
Christoph Beier
David M. Buchs
Li Hui Chen
Benjamin E. Cohen
Fabien Deschamps
Michael J. Dorais
Daniel Ebuna
Sebastian Ehmann
J. Godfrey Fitton
Patrick M. Fulton
Erdenesaikhan Ganbat
Jeffrey S. Gee
Cedric Hamelin
Takeshi Hanyu
Hiroyuki Hoshi
Lara Kalnins
Johnathon Kell
Shiki Machida
John J. Mahoney
Kazuyoshi Moriya
Alexander R.L. Nichols
Nicola Pressling
Svenja Rausch
Shin Ichi Sano
Jason B. Sylvan
Dr Rebecca Williams Rebecca.Williams@hull.ac.uk
Reader in Volcanology
Abstract
Deep-Earth convection can be understood by studying hotspot volcanoes that form where mantle plumes rise up and intersect the lithosphere, the Earth's rigid outer layer. Hotspots characteristically leave age-progressive trails of volcanoes and seamounts on top of oceanic lithosphere, which in turn allow us to decipher the motion of these plates relative to "fixed" deep-mantle plumes, and their (isotope) geochemistry provides insights into the long-term evolution of mantle source regions. However, it is strongly suggested that the Hawaiian mantle plume moved ~15° south between 80 and 50 million years ago. This raises a fundamental question about other hotspot systems in the Pacific, whether or not their mantle plumes experienced a similar amount and direction of motion. Integrated Ocean Drilling Program (IODP) Expedition 330 to the Louisville Seamounts showed that the Louisville hotspot in the South Pacific behaved in a different manner, as its mantle plume remained more or less fixed around 48°S latitude during that same time period. Our findings demonstrate that the Pacific hotspots move independently and that their trajectories may be controlled by differences in subduction zone geometry. Additionally, shipboard geochemistry data shows that, in contrast to Hawaiian volcanoes, the construction of the Louisville Seamounts doesn't involve a shield-building phase dominated by tholeiitic lavas, and trace elements confirm the rather homogenous nature of the Louisville mantle source. Both observations set Louisville apart from the Hawaiian-Emperor seamount trail, whereby the latter has been erupting abundant tholeiites (characteristically up to 95% in volume) and which exhibit a large variability in (isotope) geochemistry and their mantle source components.
Citation
Koppers, A. A., Yamazaki, T., Geldmacher, J., Anderson, L., Beier, C., Buchs, D. M., Chen, L. H., Cohen, B. E., Deschamps, F., Dorais, M. J., Ebuna, D., Ehmann, S., Fitton, J. G., Fulton, P. M., Ganbat, E., Gee, J. S., Hamelin, C., Hanyu, T., Hoshi, H., Kalnins, L., …Williams, R. (2013). IODP Expedition 330 : drilling the Louisville Seamount Trail in the SW Pacific. Scientific Drilling, 11-22. https://doi.org/10.5194/sd-15-11-2013
Journal Article Type | Article |
---|---|
Online Publication Date | Mar 1, 2013 |
Publication Date | 2013-03 |
Deposit Date | Dec 15, 2020 |
Publicly Available Date | Feb 18, 2021 |
Journal | Scientific Drilling |
Print ISSN | 1816-8957 |
Electronic ISSN | 1816-3459 |
Publisher | Copernicus Publications |
Peer Reviewed | Peer Reviewed |
Issue | 15 |
Pages | 11-22 |
DOI | https://doi.org/10.5194/sd-15-11-2013 |
Public URL | https://hull-repository.worktribe.com/output/3634765 |
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Publisher Licence URL
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Copyright Statement
© Author(s) 2013. This work is distributed under the Creative Commons Attribution 3.0 License.
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