Physics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pepi...43..274p&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 43, Issue 4, p. 274-282.
Physics
7
Scientific paper
The Upper Cambrian Peerless Formation in central Colorado contains two secondary components of magnetization. The dominant component was removed during initial AF demagnetization of specimens whereas a weaker component was removed during subsequent thermal demagnetization. IRM acquisition experiments suggest that the dominant component has low coercivity whereas the weaker component has high coercivity. The latter component has southeasterly and shallow directions and the corresponding pole position is located at 40.0°N, 134.5°E. The high coercivity, blocking temperatures over 600°C, and petrographic evidence suggest this component resides in diagenetic hematite. The magnetization is interpreted as a CRM acquired in the late Paleozoic. The low coercivity component directions fall on a great circle that passes through the modern field direction and two modes at 107°E, +10° and 287°E, -10°. This component is interpreted as a vector sum of two antipodal CRMs and a modern VRM. The pole position (10°N, 150°E) suggests acquisition in the early Paleozoic and the remanence resides either in maghemite or in diagenetic magnetite.
Douglas Elmore R.
Dubois Robert L.
Peck Charles
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