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

doi:10.1016/0012-821X(93)90114-O

Earth and Planetary Science Letters

Volume 117, Issues 1–2, May 1993, Pages 15-28

https://doi.org/10.1016/0012-821X(93)90114-O Get rights and content

Abstract

Low paleolatitudes are very frequent in Eocene to Oligocene formations, particularly in the Tethyan mobile belt. These anomalies and their possible sources are discussed. They are neither due to unreliable results nor to inclination errors in sedimentary rocks. Neither can large tectonic movements explain these discrepancies. The most probable causes having been rejected, therefore, the best explanation consists in an alternative magnetic pole position for Eurasia located at 69°N, 215°E. It is proposed that the mean magnetic field of the Earth was dipolar, but that its axis has swung from one stable position to another during the middle Tertiary and was therefore sometimes different from the rotation axis.

References (43)

WestphalM. et al.
Paleomagnetic implications on the evolution of the Tethys belt from the Atlantic ocean to the Pamirs since the Triassic
Tectonophysics
(1986)
PozziJ.P. et al.
Paleomagnetism in Tajikistan: continental shortening of European margin in the Pamirs during Indian Eurasian collision
Earth Planet. Sci. Lett.
(1991)
HornerF. et al.
Palaeomagnetic evidence from pelagic limestones for clockwise rotation of the Ionian zone, Western Greece
Tectonophysics
(1983)
KisselC. et al.
Tertiary geodynamical evolution of northwestern Greece: paleomagnetic results
Earth Planet. Sci. Lett.
(1985)
MartonE. et al.
Paleomagnetic results from Pindos, Paxos, and Ionian zones of Greece
Phys. Earth Planet. Inter.
(1990)
BinaM. et al.
Paleomagnetism, petrology and geochronology of Tertiary magmatic and sedimentary units from Iran
Tectonophysics
(1986)
SchneiderD.A. et al.
Testing models of the Tertiary paleomagnetic field
Earth Planet. Sci. Lett.
(1990)
SavostinL.A. et al.
Kinematic evolution of the Tethys belt from the Atlantic Ocean to the Pamirs since the Jurassic
Tectonophysics
(1986)
SoffelH.
Anticlockwise rotation of Italy between the Eocene and the Miocene: paleomagnetic evidence from the Colli Euganei, Italy
Earth Planet. Sci. Lett.
(1972)
ThomasJ.-Ch. et al.
A paleomagnetic study of Tertiary formations from the Kirgiz Tien-Shan and its tectonic implications
J. Geophys. Res.
(1992)

Van der VooR. et al.

Renewed paleomagnetic study of the Lisbon volcanics and implications for the rotation of the Iberian Peninsula

J. Geophys. Res.

(1971)

StoretvedtK.M. et al.

Paleomagnetic and isotopic age data from Upper Cretaceous igneous rocks of W. Portugal: geological correlation and plate tectonic aspects

Geophys. J.R. Astron. Soc.

(1987)

SoffelH.

Reinterpretation of palaeomagnetism of the Colli Euganei and Monte Lessini (Italy)

J. Geophys.

(1978)

ChannellJ.E.T. et al.

Reapparaisal of palaeomagnetism of the Colli Euganei and Monte Lessini volcanics (Italy)

J. Geophys.

(1978)

BesseJ. et al.

Revised and synthetic apparent polar wander paths of the African, Eurasian, North American and Indian plates, and true polar wander path since 200 Ma

J. Geophys. Res.

(1991)

KondopoulouD. et al.

Paleomagnetism of the Tertiary intrusives from Chalkidiki (northern Greece)

J. Geophys.

(1986)

LauerJ.P.

L'évolution géodynamique de la Turquie et de Chypre déduite de l'étude palomagnétique

Thesis

(1981)

OrbayN. et al.

Paleomagnetism of dykes and tuffs from the Messudiye region and rotation of Turkey

Geophys. J.R. Astron. Soc.

(1979)

KisselC. et al.

Etude palomagntique prliminaire des formations des Bey Daglary (Taurides occidentales, Turquie)

C.R. Acad. Sci. Paris

(1987)

SoffelH. et al.

Apparent polar wander path of Central Iran and its geotectonic interpretation

J. Geomag. Geoelectr.

(1980)

KrumsiekK.

Zur Bewegung der Iranisch-Afghanischen Platte

Geol. Rundsch.

(1976)

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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

Abstract

Tectonophysics

Earth Planet. Sci. Lett.

Tectonophysics

Earth Planet. Sci. Lett.

Phys. Earth Planet. Inter.

Tectonophysics

Earth Planet. Sci. Lett.

Tectonophysics

Earth Planet. Sci. Lett.

A paleomagnetic study of Tertiary formations from the Kirgiz Tien-Shan and its tectonic implications

J. Geophys. Res.

Renewed paleomagnetic study of the Lisbon volcanics and implications for the rotation of the Iberian Peninsula

J. Geophys. Res.

Paleomagnetic and isotopic age data from Upper Cretaceous igneous rocks of W. Portugal: geological correlation and plate tectonic aspects

Geophys. J.R. Astron. Soc.

Reinterpretation of palaeomagnetism of the Colli Euganei and Monte Lessini (Italy)

J. Geophys.

Reapparaisal of palaeomagnetism of the Colli Euganei and Monte Lessini volcanics (Italy)

J. Geophys.

Revised and synthetic apparent polar wander paths of the African, Eurasian, North American and Indian plates, and true polar wander path since 200 Ma

J. Geophys. Res.

Paleomagnetism of the Tertiary intrusives from Chalkidiki (northern Greece)

J. Geophys.

L'évolution géodynamique de la Turquie et de Chypre déduite de l'étude palomagnétique

Thesis

Paleomagnetism of dykes and tuffs from the Messudiye region and rotation of Turkey

Geophys. J.R. Astron. Soc.

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C.R. Acad. Sci. Paris

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J. Geomag. Geoelectr.

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Geol. Rundsch.