scholarly journals Geomagnetic Field, Polarity Reversals

2012 ◽  
Keyword(s):  
Geomagnetic Field ◽  
Field Polarity ◽  
Polarity Reversals

Paleomagnetism of the Great Slave Supergroup, Northwest Territories, Canada: the Stark Formation

1976 ◽  
Vol 13 (4) ◽  
pp. 563-578 ◽  
Author(s):  
D. K. Bingham ◽  
M. E. Evans
Keyword(s):  
Northwest Territories ◽  
North American ◽  
Geomagnetic Field ◽  
Pole Position ◽  
The West ◽  
Stratigraphic Sequence ◽  
Polar Wander ◽  
Early Proterozoic ◽  
The North ◽  
Polarity Reversals

Paleomagnetic results from 55 sampling sites throughout the Stark Formation are reported. The known stratigraphic sequence of these sites enables the behaviour of the geomagnetic field in these remote times (1750 m.y.) to be elucidated. Two polarity reversals are identified and these represent potentially useful correlative features in strata devoid of index fossils. One of these is investigated in detail and indicates that behaviour of the geomagnetic field during polarity reversals was essentially the same in the early Proterozoic as it has been over the last few million years. The pole position (145°W, 15°S, dp = 3.5, dm = 6.9) lies far to the west of that anticipated from earlier results, implying further complexity of the North American polar wander curve. Possible alternatives to this added complexity are discussed.

scholarly journals Multidecadally resolved polarity oscillations during a geomagnetic excursion

2018 ◽  
Vol 115 (36) ◽  
pp. 8913-8918 ◽  
Author(s):  
Yu-Min Chou ◽  
Xiuyang Jiang ◽  
Qingsong Liu ◽  
Hsun-Ming Hu ◽  
Chung-Che Wu ◽  
...  
Keyword(s):  
20Th Century ◽  
Geomagnetic Field ◽  
Early 20Th Century ◽  
Human Society ◽  
Before Present ◽  
Earth History ◽  
Geomagnetic Excursion ◽  
Deep Interior ◽  
Polarity Reversals ◽  
Chinese Stalagmite

Polarity reversals of the geomagnetic field have occurred through billions of years of Earth history and were first revealed in the early 20th century. Almost a century later, details of transitional field behavior during geomagnetic reversals and excursions remain poorly known. Here, we present a multidecadally resolved geomagnetic excursion record from a radioisotopically dated Chinese stalagmite at 107–91 thousand years before present with age precision of several decades. The duration of geomagnetic directional oscillations ranged from several centuries at 106–103 thousand years before present to millennia at 98–92 thousand years before present, with one abrupt reversal transition occurring in one to two centuries when the field was weakest. These features indicate prolonged geodynamo instability. Repeated asymmetrical interhemispheric polarity drifts associated with weak dipole fields likely originated in Earth’s deep interior. If such rapid polarity changes occurred in future, they could severely affect satellites and human society.

scholarly journals Clustering of Polarity Reversals of the Geomagnetic Field

2006 ◽  
Vol 96 (12) ◽  
Author(s):  
V. Carbone ◽  
L. Sorriso-Valvo ◽  
A. Vecchio ◽  
F. Lepreti ◽  
P. Veltri ◽  
...  
Keyword(s):  
Geomagnetic Field ◽  
Polarity Reversals
Sign in / Sign up

Export Citation Format

Share Document