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Palaeomagnetism and Magnetic?Polarity Zonation in some Oligocene Volcanic Rocks of the San Juan Mountains, South?western Colorado

Citation

Diehl, Jimmy F, Beck, Myrl E, and Lipman, Peter W, Palaeomagnetism and Magnetic?Polarity Zonation in some Oligocene Volcanic Rocks of the San Juan Mountains, South?western Colorado: .

Summary

Palaeomagnetic results have been obtained from thirty sites in intrusive and extrusive rocks of Oligocene age from the San Juan Mountains, south-western Colorado. All specimens from each site were subjected to af demagnetization, and the reliability of each site determined. Twenty-three sites gave reliable results. Because five sites from the thick intracaldera part of the La Jara Canyon Member of the Treasure Mountain Tuff appear to have become magnetized during the same small interval of geological time, their results were combined and their mean pole and direction used in the final calculations. The eighteen remaining reliable sites yielded an average Oligocene palaeomagnetic pole at 85�6� N and 298�0� E (?p= 8�, ?m= 11�, k= 24�1). [...]

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  • Upper Colorado River Basin

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From Source - Mendeley RIS Export <br> On - Wed Sep 19 08:03:42 MDT 2012

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Title Citation Palaeomagnetism and Magnetic?Polarity Zonation in some Oligocene Volcanic Rocks of the San Juan Mountains, South?western Colorado

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