Further paleomagnetic results for the San Juan volcanic field of southern Colorado |
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Authors: | Myrl E. Beck Steven D. Sheriff Jimmy F. Diehl Ernest A. Hailwood Peter W. Lipman |
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Affiliation: | 1. U.S. Geological Survey, Western Washington State College, Bellingham, Wash. 98225USA;2. Department of Geology, Western Washington State College, Bellingham, Wash. 98225USA |
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Abstract: | Combining paleomagnetic data for 17 new sites from the northwest portion of the (Oligocene) San Juan volcanic field of southern Colorado with data for 29 sites previously published yields a paleomagnetic pole at 85°N, 114°E (with a 95% confidence circle of 7.5° radius). A further combination of the San Juan data with the results of other studies on rocks of Oligocene age from tectonically stable parts of North America gives a mid-Tertiary reference pole located at 81°N, 132.5°E, with a confidence circle of approximately 4°. Mid-Tertiary paleomagnetic poles for the western edge of the continent diverge markedly from this reference pole. |
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