Paleomagnetism of the late Cambrian Crepicephalus-Aphelaspis trilobite zone boundary in North America-divergent poles from isochronous strata

Details Paleomagnetism of the late Cambrian Crepicephalus-Aphelaspis trilobite zone boundary in North America-divergent poles from isochronous strata Paleomagnetism of the late Cambrian Crepicephalus-Aphelaspis trilobite zone boundary in North America-divergent poles from isochronous strata

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..58..383g&link_type=abstract

Earth and Planetary Science Letters, Volume 58, Issue 3, p. 383-394.

Mathematics

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7

Scientific paper

Paleomagnetic samples from the Nolichucky Formation (Late Cambrian), sampled at two sites in the Valley and Ridge Province of east Tennessee, yield a possibly penecontemporaneous characteristic magnetization that appears to reside in detrital magnetite. The paleomagnetic pole positions are ``Paleozoic'', but differ: site I, lat. 41°N, long. 109°E, dp = 1°, dm = 2° site II, lat. 39°N, long. 131°E, dp = 4°, dm = 7°. The difference in poles reflects a significant difference in declination between the site-mean directions, and this declination difference probably reflects relative tectonic rotation as the sites are in different thrust sheets. The paleontologic age of both sections is exceptionally well-constrained as they are sampled across an abrupt ``biomere boundary'' between contrasting trilobite faunas. Comparison of these results with paleomagnetic data from coeval strata elsewhere in North America reveals gross discrepancies, so that at least some of the published data must reflect remagnetization and/or tectonic rotation.
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