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Geomagnetic field behavior at high latitudes from a paleomagnetic record from Eltanin core 2721 in the Ross Sea sector, Antarctica
 

Summary: Geomagnetic field behavior at high latitudes from a paleomagnetic record
from Eltanin core 2721 in the Ross Sea sector, Antarctica
Luigi Jovane a,b,, Gary Acton a
, Fabio Florindo b
, Kenneth L. Verosub a
a
Department of Geology, University of California, Davis, CA, 95616, USA
b
Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143, Roma, Italy
Received 12 August 2007; received in revised form 2 December 2007; accepted 3 December 2007
Editor: M.L. Delaney
Available online 15 December 2007
Abstract
We present a high-resolution paleomagnetic record from 682 discrete samples from Eltanin 2721 (69.03S 179.83E), a 16-meter long piston
core recovered in 1968 at a water depth of 3456 m by the USNS Eltanin as part of Operation Deep Freeze. After removal of a low-coercivity
overprint, most samples yield stable characteristic remanent magnetization directions. The downhole variation in the magnetic inclination provides
a well-resolved magnetostratigraphy from the Brunhes Chron (00.781 Ma), through the Reunion Subchron (2.1282.148 Ma), and into Chron
C2r.2r. The sedimentation rates are sufficiently high that even short-term geomagnetic features, like the Cobb Mountain excursion, are resolved.
The record from Eltanin 2721 provides new insights into the behavior of the geomagnetic field at high latitudes, about which very little is
currently known. Using the variability in the inclinations during stable polarity intervals, we estimate that the dispersion in the paleomagnetic pole

  

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

 

Collections: Geosciences