Palaeointensity of West Greenland Palaeocene basalts: asymmetric intensity around the C27n-C26r transition

Details Palaeointensity of West Greenland Palaeocene basalts: asymmetric intensity around the C27n-C26r transition Palaeointensity of West Greenland Palaeocene basalts: asymmetric intensity around the C27n-C26r transition

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pepi..118...53r&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 118, Issue 1-2, p. 53-64.

Physics

13

Scientific paper

Palaeomagnetic sampling of the lower part of the Palaeocene flood basalts of West Greenland, covering a composite succession of 1.6 km and close to 350 individual lava flows, revealed two polarity zones and a 200-m zone of intermediate directions. 40Ar/39Ar ages indicate that the transition is C27n-C26r. Following palaeodirectional and rock magnetic analysis, 102 samples from 64 flows from the pre-transitional normal polarity zone, the zone of intermediate directions, and the post-transitional reverse polarity zone were chosen for Thellier palaeointensity experiments. Altogether, 83 samples yielded reliable palaeointensity estimates. The mean intensity of the pre-transitional C27n field is 16.1+/-6.9 μT (17 flows), which is only twice the mean transitional field strength, 9.9+/-3.7 μT (10 flows). The post-transitional C26r field intensity is generally high with a mean 43.3+/-15.0 μT (21 flows). The asymmetric palaeointensity around the C27n-C26r transition with a high post-transitional field resembles the only other detailed absolute palaeointensity studies of geomagnetic transitions recorded in volcanic sequences in Hawaii (~4 Ma) and Steens Mountain (~15.5 Ma). These new data, therefore, suggest that a strong post-transitional field might be a systematic feature of geomagnetic reversals, probably indicating a prolonged period of an unusual state of the geodynamo following polarity transitions.

Affiliated with

Also associated with

No associations

Rating

Palaeointensity of West Greenland Palaeocene basalts: asymmetric intensity around the C27n-C26r transition does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Palaeointensity of West Greenland Palaeocene basalts: asymmetric intensity around the C27n-C26r transition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Palaeointensity of West Greenland Palaeocene basalts: asymmetric intensity around the C27n-C26r transition will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1801378