Physics
Scientific paper
Apr 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971pepi....4..329s&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 4, Issue 4, p. 329-346.
Physics
2
Scientific paper
Of six Precambrian rock types sampled at 12 sites in the Franklin Mountains, El Paso, Texas, a remanence which is stable to AF and/or thermal demagnetization has been isolated from Red Bluff granite, Franklin Mountain rhyolite, Fusselman Canyon diabase and hornfels in the Castner marble. Additional stability test are provided by reversals in the igneous rocks, the agreement of directions in the granite and its baked margin, a conglomerate test using granite cobbles from Recent Bolson deposits, and the randomness of directions in a tuffisite horizon at the base of the rhyolite pile. After structural correction the mean directions of magnetization from these four units are identical and give a paleomagnetic pole at 160° W, 28° N (δp = 5°, δm = 6°), which is considered to represent the field axis at the time of granite/rhyolite emplacement at 950 × 106 y. An older magnetic event may be recorded in the Castner hornfels. The 950 × 106 y pole is northeast of poles from North American rocks of the same age, but is identical with a pole from the 935 × 106 y Scottish Lower Torridonian Series, making allowance for continental drift: this suggest that a short period excursion of the field axis occurred during 935-950 × 106 y away from the main polar wandering path.
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