Limited latitudinal mantle plume motion for the Louisville hotspot

Anthony A.P. Koppers*, Toshitsugu Yamazaki, Jörg Geldmacher, Jeffrey S. Gee, Nicola Pressling, Hiroyuki Hoshi, L. Anderson, C. Beier, D. M. Buchs, L. H. Chen, B. E. Cohen, F. Deschamps, M. J. Dorais, D. Ebuna, S. Ehmann, J. G. Fitton, P. M. Fulton, E. Ganbat, C. Hamelin, T. HanyuL. Kalnins, J. Kell, S. MacHida, J. J. Mahoney, K. Moriya, A. R.L. Nichols, S. Rausch, S. I. Sano, J. B. Sylvan, R. Williams

*この研究の対応する著者

研究成果: Article査読

61 被引用数 (Scopus)

抄録

Hotspots that form above upwelling plumes of hot material from the deep mantle typically leave narrow trails of volcanic seamounts as a tectonic plate moves over their location. These seamount trails are excellent recorders of Earth's deep processes and allow us to untangle ancient mantle plume motions. During ascent it is likely that mantle plumes are pushed away from their vertical upwelling trajectories by mantle convection forces. It has been proposed that a large-scale lateral displacement, termed the mantle wind, existed in the Pacific between about 80 and 50 million years ago, and shifted the Hawaiian mantle plume southwards by about 15° of latitude. Here we use 40 Ar/ 39 Ar age dating and palaeomagnetic inclination data from four seamounts associated with the Louisville hotspot in the South Pacific Ocean to show that this hotspot has been relatively stable in terms of its location. Specifically, the Louisville hotspot - the southern hemisphere counterpart of Hawai'i - has remained within 3-5° of its present-day latitude of about 51° €‰S between 70 and 50 million years ago. Although we cannot exclude a more significant southward motion before that time, we suggest that the Louisville and Hawaiian hotspots are moving independently, and not as part of a large-scale mantle wind in the Pacific.

本文言語English
ページ(範囲)911-917
ページ数7
ジャーナルNature Geoscience
5
12
DOI
出版ステータスPublished - 2012 12

ASJC Scopus subject areas

  • 地球惑星科学(全般)

フィンガープリント

「Limited latitudinal mantle plume motion for the Louisville hotspot」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル