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Showing 1–13 of 13 results
Advanced filters: Author: Trond H. Torsvik Clear advanced filters

  • The Hawaiian-Emperor Chain has a 60° bend that has been interpreted as the result of Pacific plate motion at 47 Ma or drift of the Hawaiian hotspot. Here, the authors show that hotspot drift cannot be the dominant mechanism for bend formation, but involves a change in the direction of Pacific plate motion at ∼47 Ma.

    • Trond H. Torsvik
    • Pavel V. Doubrovine
    • Mathew Domeier
    ResearchOpen Access
    Nature Communications
    Volume: 8, P: 1-12

  • Diamonds are formed under high pressure more than 150 kilometres deep in the Earth's mantle, and are brought to the surface mainly by volcanic rocks called kimberlites. Here, plate reconstructions and tomographic images have been used to show that the edges of the largest heterogeneities in the deepest mantle, stable for at least 200 million years and possibly for 540 million years, seem to have controlled the eruption of most Phanerozoic kimberlites. This has implications for future exploration for kimberlites.

    • Trond H. Torsvik
    • Kevin Burke
    • Lewis D. Ashwal
    Research
    Nature
    Volume: 466, P: 352-355

  • There is growing evidence for the presence of continental fragments within the young oceanic basins, but this is still based on limited geological data. Here, the authors use zircon isotope geochronology to demonstrate the presence of Archaean continental crust beneath the young hotspot volcanoes of Mauritius.

    • Lewis D. Ashwal
    • Michael Wiedenbeck
    • Trond H. Torsvik
    ResearchOpen Access
    Nature Communications
    Volume: 8, P: 1-9

  • The observed motion of continents relative to the Earth's spin axis may be due either to rotation of the entire Earth relative to its spin axis ('true polar wander'), or to the motion of individual tectonic plates. To distinguish between these processes, the global average of continental motion and rotation in a palaeomagnetic reference frame over the past 320 Myr was computed and two components were identified: a steady northward motion and, during certain time intervals, clockwise and counterclockwise rotations, which they interpret as true polar wander.

    • Bernhard Steinberger
    • Trond H. Torsvik
    Research
    Nature
    Volume: 452, P: 620-623

  • Ridges of thick, raised crust on the Indian Ocean floor were thought to be mostly volcanic seamounts formed above the Réunion mantle plume. Dating of zircon minerals in Mauritian lavas, however, indicates that fragments of an ancient microcontinent may be preserved beneath the seamounts, contributing to the thickened crust.

    • Trond H. Torsvik
    • Hans Amundsen
    • Bjørn Jamtveit
    Research
    Nature Geoscience
    Volume: 6, P: 223-227

  • Global-scale mantle flow patterns can be deduced from the net behaviour (convergence and divergence) of surface plate motions; persistent quadrupole divergence in central Africa and the central Pacific suggest sustained stationary upwelling beneath these locations in the mantle.

    • Clinton P. Conrad
    • Bernhard Steinberger
    • Trond H. Torsvik
    Research
    Nature
    Volume: 498, P: 479-482

    • Clinton P. Conrad
    • Bernhard Steinberger
    • Trond H. Torsvik
    Research
    Nature
    Volume: 503, P: E4

  • The movement of tectonic plates before the Cretaceous period is poorly understood. A global mantle tomography model suggests that the longitude of oceanic subduction zones up to 300 million years ago was offset by up to 18∘ compared with tectonic reconstructions for the same period.

    • Douwe G. van der Meer
    • Wim Spakman
    • Trond H. Torsvik
    Research
    Nature Geoscience
    Volume: 3, P: 36-40

  • Kimberlites are rare volcanic rocks with unusually deep origins. This Review explores the origin and evolution of kimberlite melts and their insights into mantle composition and dynamics.

    • Andrea Giuliani
    • Max W. Schmidt
    • Yana Fedortchouk
    Reviews
    Nature Reviews Earth & Environment
    Volume: 4, P: 738-753