A review of lacustrine paleomagnetic records from western North America: 0-40000 years BP

Details A review of lacustrine paleomagnetic records from western North America: 0-40000 years BP A review of lacustrine paleomagnetic records from western North America: 0-40000 years BP

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...56...76h&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 56, Issue 1-2, p. 76-95.

Physics

12

Scientific paper

A review of 16 lake sediment paleomagnetic records from western North America, spanning time intervals over the last 40 000 yr BP, provides evidence that many of these lacustrine records have recorded geomagnetic secular variation with wavelengths on the order of a few hundred years. The younger studies (0-13 300 yr BP) show general morphologic agreement among inclination records, but most of the declination records are difficult to correlate. Among the older records there are major disagreements over the existence of the Mono Lake excursion. Specifically, five studies contain evidence for the excursion, but six studies do not show any record of it.
Because errors in radiocarbon dating will distort down-core time-scales, the younger records were rescaled with time-scales that were constructed from extremal correlations of long-wavelength (~ 1000-2000 yr), high-amplitude (~ 10-20°) inclination features. With these new time-scales, the excellent temporal and morphologic agreement between the Fish Lake, Oregon, and Blue Lake, Idaho, declination records confirms the existence of errors in the radiocarbon time-scales. The lack of agreement among the other rescaled declination records indicates that the records have been distorted or altered by sedimentary and geologic processes and/or by sampling, measuring and data analysis procedures.
In terms of the regional geomagnetic record, Fish Lake and Blue Lake present a 3300-yr master curve of secular variation for northeastern Oregon and southwestern Idaho. The lack of correlation among the other records, however, prevents us from drawing definite conclusions about the areal variation of the geomagnetic field in western North America over the past 40000 yr BP.

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