Did a large departure from the geocentric axial dipole hypothesis occur during the Eocene? Evidence from the magnetic polar wander path of Eurasia

Westphal, M.

doi:10.1016/0012-821x(93)90114-o

Cited by 81 publications

(64 citation statements)

References 28 publications

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“…Contributions to the difference may come also from non-dipole components in the long-term average geomagnetic field. A large non-dipole component in the Eocene geomagnetic field has recently been suggested from European data (Westphal 1993).…”

Section: Discussionmentioning

confidence: 97%

New Late Eocene pole for Australia, time-averaging of remanence directions, and palaeogeographic reference systems

Idnurm

1994

Geophysical Journal International

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S U M M A R YA new Late Eocene (-36.5 Ma) South palaeomagnetic pole based, on 33 sampling levels in the Browns Creek Formation of the Otway Basin, south-eastern Australia, lies at 65.5"S, 112.5"E with Ag5 = 2.5". This pole fills a 30 Myr gap in the Palaeogene part of the Australian apparent polar wander pole path, and appears well suited for calibrating the path because of a well-defined age and evidence that the sequence was magnetized during a depositional period long enough to thoroughly average out secular variations. The remanence seems to have been acquired during postdepositional re-working of the sediment. The pole agrees with one biostratigraphically dated and three undated poles that constrain the Palaeogene trajectory.All Palaeogene poles on the path lie west of an alternative apparent polar wander path. The latter is modelled by low-order curve fitting of much more widely scattered poles from basalts in which the-scatter appears to be due to incomplete time-averaging of remanence directions. The new pole also reinforces a previously observed systematic westward displacement, by a few degrees, of the early Tertiary palaeomagnetic poles relative to hotspot-derived poles. This displacement may be caused by true polar wander and/or departures from the geocentric axial dipole model. It again highlights the approximateness of the available palaeogeographic reference systems.

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Section: Discussionmentioning

confidence: 97%

New Late Eocene pole for Australia, time-averaging of remanence directions, and palaeogeographic reference systems

Idnurm

1994

Geophysical Journal International

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“…This contradicts paleomagnetic data, which indicate a location of the arc some 1,300-1,500 km south of Kamchatka in the Bartonian and Lutetian (Levashova et al 2000a, b). Similar discrepancies between geological and paleomagnetic data in Tertiary formations were documented in many regions over the world, as magnetic inclinations both in sedimentary and volcanic rocks are found up to 20°s hallower than can be expected (Westphal et al 1986(Westphal et al , 1993Gilder et al 1996;Cogne et al 1999). Undetected intra-plate movements, poorly constrained reference poles, a nonaxial magnetic field, and a non-dipolar magnetic field were discussed as possible explanations of this phenomenon, but its nature still remains rather unclear (Westphal 1993).…”

Section: Arc-continent Collisionmentioning

confidence: 92%

Collision of the Kronotskiy arc at the NE Eurasia margin and structural evolution of the Kamchatka–Aleutian junction

Алексеев

Gaedicke

Tsukanov

et al. 2006

Int J Earth Sci (Geol Rundsch)

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“…The effect of combining zonal harmonics, as suggested by numerous authors (e.g. Briden et al, 1970;Westphal, 1993;McElhinny et al, 1996;Kent and Smethurst, 1998;Torsvik and van der Voo, 2002), is illustrated by the dashed curve, for which g…”

Section: The Palaeoinclination Testmentioning

confidence: 81%

Testing the GAD throughout geological time

Evans

Hoye

2007

Earth Planet Sp

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The suggestion that the morphology of the geomagnetic field can be tested by inspecting the statistical distribution of palaeomagnetically-determined inclination angles has been challenged on the grounds that typical plate velocities require extremely long sampling intervals-perhaps exceeding the age of the Earth-in order to adequately sample the Earth's surface. Here, we investigate this problem by means of a random walk model and conclude that an interval equivalent to Phanerozoic time (600 Myr) is generally sufficient.

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Did a large departure from the geocentric axial dipole hypothesis occur during the Eocene? Evidence from the magnetic polar wander path of Eurasia

Cited by 81 publications

References 28 publications

New Late Eocene pole for Australia, time-averaging of remanence directions, and palaeogeographic reference systems

New Late Eocene pole for Australia, time-averaging of remanence directions, and palaeogeographic reference systems

Collision of the Kronotskiy arc at the NE Eurasia margin and structural evolution of the Kamchatka–Aleutian junction

Testing the GAD throughout geological time

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