Palaeomagnetism

  • Article
    | Open Access

    The authors present a high-resolution palaeomagnetic record for a Late Cretaceous limestone in Italy. They claim that their record robustly shows a ~12° true polar wander oscillation between 86 and 78 Ma, with the greatest excursion at 84–82 Ma.

    • Ross N. Mitchell
    • , Christopher J. Thissen
    •  & Joseph L. Kirschvink
  • Article
    | Open Access

    This study describes how the geomagnetic axial dipole dominance of Earth’s magnetic field remained stable through large parts of the geological time. Since other characteristics of the geomagnetic field have changed substantially on the same timescales, this new observation provides a challenge for future core modeling studies.

    • Andrew J. Biggin
    • , Richard K. Bono
    •  & Pavel V. Doubrovine
  • Article
    | Open Access

    Marine records indicate a greenhouse to icehouse climate transition at ~34 million years ago, but how the climate changed within continental interiors at this time is less well known. Here, the authors show an orbital climate response shift with aridification on the northeastern Tibetan Plateau during this time.

    • Hong Ao
    • , Guillaume Dupont-Nivet
    •  & Zhisheng An
  • Article
    | Open Access

    Controversy surrounds the fixity of both hotspots and large low shear velocity provinces (LLSVPs). Here, the authors present new paleomagnetic data to show that the great bend in the Hawaiian-Emperor seamount chain can be attributed to mantle plume motion and that LLSVPs are mobile.

    • Richard K. Bono
    • , John A. Tarduno
    •  & Hans-Peter Bunge
  • Article
    | Open Access

    Understanding the response of marine productivity and CO2 drawdown to past warming events can provide important insights into the future. Here, the authors use bacterial magnetite nanoparticle fossils to reconstruct nutrient supply and marine deoxygenation during the Palaeocene–Eocene Thermal Maximum.

    • Liao Chang
    • , Richard J. Harrison
    •  & Xiang Zhao
  • Article
    | Open Access

    The role Tibetan Plateau uplift played in Asian inland aridification remains unclear due to a paucity of accurately dated records. Here, the authors present a continuous aeolian sequence for the period >51–39 Ma, analysis of which indicates that aridification was driven by global climatic forcing rather than uplift.

    • J. X. Li
    • , L. P. Yue
    •  & Q. S. Liu
  • Article
    | Open Access

    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
  • Article
    | Open Access

    Rapid and spatially localized geomagnetic field variations around 1000 BC are hard to reconcile with expected field behaviour arising from the core dynamo. Here, the authors show that the intensity spike is consistent with an intense flux patch on the core-mantle boundary (8–22°) located under Saudi Arabia.

    • Christopher Davies
    •  & Catherine Constable
  • Article |

    Obtaining reliable estimates of the absolute palaeointensity of the Earth’s magnetic field is difficult and many methods induce alteration. de Groot et al.present a means to see and explain changes in magnetization in unreliable samples, explaining why some samples systematically fail paleointensity experiments.

    • Lennart V. de Groot
    • , Karl Fabian
    •  & Mark J. Dekkers