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Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3520307y&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 20, CiteID L20307
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3
Geomagnetism And Paleomagnetism: Paleomagnetic Secular Variation, Geomagnetism And Paleomagnetism: Paleointensity, Geomagnetism And Paleomagnetism: Time Variations: Secular And Longer, Geomagnetism And Paleomagnetism: Spatial Variations: All Harmonics And Anomalies
Scientific paper
A paleomagnetic study was conducted on four piston cores newly obtained from the West Caroline Basin in the western equatorial Pacific in order to investigate variations in paleointensity and inclination during the last 400 kyr. An inclination-intensity correlation was previously reported in this region using giant piston cores, but the quality of the paleomagnetic data of the younger end, the last ca. 300 kyr, was needed to be checked because the upper part of the giant piston cores could suffer from perturbation by oversampling. Age control is based on the oxygen-isotope ratios for one core and inter-core correlation using relative paleointensity for other cores. Stacked curves of paleointensity and inclination were constructed from the four cores. It was confirmed that variations on the order of 104 to 105 years occur in inclination as well as paleointensity. A cross-correlation analysis showed that significant in-phase correlation occurs between intensity and inclination for periods longer than about 25 kyr, and power spectra of both paleointensity and inclination variations have peaks at ~100 kyr periods. The regional paleointensity stack with higher resolution than the Sint-800 stack (Guyodo and Valet, 1999) should be useful for paleointensity-assisted chronostratigraphy.
Gaffar Eddy Z.
Hokanishi Natsumi
Kanamatsu Toshiya
Mizuno Sakiko
Yamazaki Toshitsugu
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