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Keigwin, L.D., Rio, D., Acton, G.D., and Arnold, E. (Eds.) Proceedings of the Ocean Drilling Program, Scientific Results Volume 172
 

Summary: Keigwin, L.D., Rio, D., Acton, G.D., and Arnold, E. (Eds.)
Proceedings of the Ocean Drilling Program, Scientific Results Volume 172
11. PALEOMAGNETIC RECORDS OF STAGE 3
EXCURSIONS, LEG 1721
Steve P. Lund,2 Gary D. Acton,3 Brad Clement,4 Makoto Okada,5
and Trevor Williams6
ABSTRACT
Shipboard long-core paleomagnetic measurements made during
Ocean Drilling Program Leg 172 identified a reproducible pattern of di-
rectional secular variation between ~15,000 and 45,000 k.y. that could
be correlated between Sites 1061, 1062, and 1063, which span a dis-
tance of more than 1200 km. Two intervals of excursional paleomag-
netic directions were identified at all three sites and were labeled as
excursions 3 and 3. New analysis of excursions 3 and 3, based on
reassessment of the shipboard measurements, new U-channel paleo-
magnetic records of the excursions, and independently published dis-
crete sample paleomagnetic records of the same intervals all indicate
that excursion 3 is not real; its directional variability is less than origi-
nally estimated and not excursional. Excursion 3 is real and easily
identified in both U-channel and discrete sample measurements. Excur-

  

Source: Acton, Gary - Department of Geology, University of California, Davis

 

Collections: Geosciences