Summary: Keigwin, L.D., Rio, D., Acton, G.D., and Arnold, E. (Eds.)
Proceedings of the Ocean Drilling Program, Scientific Results Volume 172
10. BRUNHES CHRON MAGNETIC FIELD
EXCURSIONS RECOVERED FROM LEG 172
Steve P. Lund,2 Trevor Williams,3 Gary D. Acton,4 Brad Clement,5
and Makoto Okada6
During Ocean Drilling Program Leg 172, we recovered long-core pa-
leomagnetic records of 14 "plausible" magnetic field excursions within
the Brunhes Chron at Sites 10601063, separated by more than 1200
km. New U-channel paleomagnetic studies of all 14 excursions indicate
that 12 have true excursional directions and are almost certainly "real"
geomagnetic field excursions, but five excursions still require discrete
sample paleomagnetic measurements to further replicate these results.
U-channel measurements for two of the original 14 "plausible" excur-
sions (3 and 5) did not show evidence of true excursional directions
and are no longer considered real. U-channel measurements also identi-
fied one new excursion not identified during shipboard measurements.