Other
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmgp34a..02h&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #GP34A-02
Other
1513 Geomagnetic Excursions, 1520 Magnetostratigraphy, 1522 Paleomagnetic Secular Variation, 1530 Rapid Time Variations, 1535 Reversals: Process, Timescale, Magnetostratigraphy
Scientific paper
The Pringle Falls excursion is one of ten gobally identified geomagnetic excursions that have been well-dated and well-documented in several marine sediment cores or terrestrial rocks, and that define the Geomagnetic Instability Time Scale (GITS) for the Bruhnes Chron. To study the characteristics of the Pringle Falls polarity episode in detail, we drilled a total of 827 samples from five widely spaced profiles along the Deschutes River in Oregon. The five profiles sampled yield a high-resolution record of the Pringle Falls magnetic polarity episode, providing a detailed representation of field behavior during the excursion. We performed low-field vs. susceptibility analysis to determine the magnetic carriers of the sediments and we found that the main magnetic carrier is pure magnetite (Curie point 575 degrees C). The magnetic grain size indicated SD-MD magnetite. The demagnetization of the sediments was done by means of alternating field methods and the determination of the mean directions by principal component analyses. The VGP paths of each profile are very similar to each other. All of them define a clockwise loop traveling from high northern latitudes over the eastern part of North America and the North Atlantic to South America and higher southern latitudes, then returning to high northern latitudes through the Pacific and over Kamchatka. This last clockwise looping is characteristic of other recently found excursions like the Iceland basin excursion (IBE, 188 ka). The published age of the Pringle falls excursion (ca. 218 +/-14 ka) and the most recent radiometric ages at the Pringle Falls site (weighted mean 211 +/- 13 ka, Singer et al., 2008, EPSL, 267, 584-595), indicate that paleomagnetic polarity episodes of different ages may all have similar transition polar paths. This observation would seem to suggest that a common mechanism of the generation of the paleofield is involved in controlling the excursions at least during the Bruhnes Chron.
Canon Tapia E.
Herrero-Bervera Emilio
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