Magnetic lineations in the Pacific Jurassic quiet zone

Details Magnetic lineations in the Pacific Jurassic quiet zone Magnetic lineations in the Pacific Jurassic quiet zone

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..41..434c&link_type=abstract

Earth and Planetary Science Letters, Volume 41, Issue 4, p. 434-440.

Physics

13

Scientific paper

Magnetic anomalies of low amplitude (<100 gammas) are present in the Jurassic magnetic quiet zone of the western Pacific Ocean. These small anomalies are lineated and can be correlated among the Phoenix, Hawaiian and Japanese lineation patterns. Thus, they represent seafloor spreading that recorded some sort of magnetic field phenomena prior to magnetic anomaly M25 at 153 m.y. B.P. The most likely possibility is that they represent a series of late Jurassic magnetic field reversals that occurred during a period of anomalously low magnetic field intensity. We propose a time scale of magnetic reversals between 153 and 158 m.y. B.P. to account for these anomalies and suggest that the dipole magnetic field intensity increased by a factor of about four from 160 to 140 m.y. B.P. in the late Jurassic.

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