Limited latitudinal mantle plume motion for the Louisville hotspot

DOI HANDLE PDF Web Site 被引用文献5件 参考文献21件 オープンアクセス

書誌事項

公開日
2012-11-25
資源種別
journal article
権利情報
  • http://www.springer.com/tdm
  • http://www.springer.com/tdm
DOI
  • 10.1038/ngeo1638
公開者
Springer Science and Business Media LLC

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説明

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 40Ar/39Ar 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.

International audience

収録刊行物

  • Nature Geoscience

    Nature Geoscience 5 (12), 911-917, 2012-11-25

    Springer Science and Business Media LLC

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