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Paleomagnetism of some Precambrian basaltic flows and red beds, Eastern Grand Canyon, Arizona

Earth and Planetary Science Letters
By:  and 
https://doi.org/10.1016/0012-821X(73)90064-2

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Abstract

Lava flows and red sandstone beds near the middle of the Upper Precambrian Grand Canyon Series exhibit stable remanent magnetization. The beds are about 1000 m stratigraphically above rocks of the Grand Canyon Series for which paleomagnetic poles have been reported. All specimens were subjected to stepwise thermal (200°–700°C) or alternating field (25–5000 Oe) demagnetization for the determination of characteristic magnetization. The pole for two flows and an intercalated sandstone bed of the Cardenas Lavas of Ford, Breed and Mitchell (upper Unkar Group), is at 174.6W, 0.4N (N = 10, K = 50, α95 = 6.9°). The pole for a weathered zone developed across the Cardenas Lavas is at 167.8W, 49.4N (N = 5, K = 79, α95 = 8.6°). The pole for directly overlying sandstone of the Nankoweap Formation of Maxson is at 174.4E, 12.5N (N = 6, K = 105, α95 = 6.6°). These poles lie on or near, and appear to follow, part of an apparent polar wandering path recently proposed for the Precambrian of North America by Spall. If the fit is not accidental, little or no rotation has occurred between north-central Arizona and parts of the North American continent used to define the proposed path.

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    Publication type Article
    Publication Subtype Journal Article
    Title Paleomagnetism of some Precambrian basaltic flows and red beds, Eastern Grand Canyon, Arizona
    Series title Earth and Planetary Science Letters
    DOI 10.1016/0012-821X(73)90064-2
    Volume 18
    Issue 2
    Year Published 1973
    Language English
    Publisher Elsevier
    Description 13 p.
    First page 253
    Last page 265
    Country United States
    State Arizona
    Other Geospatial Eastern Grand Canyon
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