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Three-dimensional magnetic stripes require slow cooling in fast-spread lower ocean crust
A record of Earth’s magnetic field constructed from near-bottom magnetization observations and oriented samples provides three-dimensional imaging of magnetic stripes in fast-spread crust, and suggests slow cooling off-axis, as opposed to deep hydrothermal cooling close to the spreading ridge.
- Sarah M. Maher
- , Jeffrey S. Gee
- & Barbara E. John
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Letter |
Magnetism in cold subducting slabs at mantle transition zone depths
Synchrotron Mössbauer source spectroscopy is used to reveal that haematite remains magnetic in cold subducting slabs at the depth of the transition zone in the Earth’s mantle, with implications for the locations of magnetic poles during inversions of the Earth’s magnetic field.
- I. Kupenko
- , G. Aprilis
- & C. Sanchez-Valle
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Letter |
Palaeomagnetic field intensity variations suggest Mesoproterozoic inner-core nucleation
Analysis of a database of Precambrian palaeomagnetic intensity measurements reveals a clear transition in the Earth’s magnetic field that is probably the signature of the inner core first forming, suggesting a modest value of core thermal conductivity and supporting a simple thermal evolution model for the Earth.
- A. J. Biggin
- , E. J. Piispa
- & L. Tauxe
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Letter |
Mechanisms for oscillatory true polar wander
Stabilization of the Earth’s rotation axis by a combination of long-term excess ellipticity and elastic stresses in the broken lithosphere provides an explanation for oscillatory true polar wander events spanning the past few billion years of Earth history.
- J. R. Creveling
- , J. X. Mitrovica
- & I. Matsuyama
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Letter |
A long-lived lunar dynamo driven by continuous mechanical stirring
- C. A. Dwyer
- , D. J. Stevenson
- & F. Nimmo
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News Feature |
Geology: A trip to dinosaur time
A project to drill a 10-kilometre-deep hole in China will provide the best view yet of the turbulent Cretaceous period. Jane Qiu reports.
- Jane Qiu