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Geology

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Western Washington University

Geology Faculty Publications

2003

Articles 1 - 2 of 2

Full-Text Articles in Physical Sciences and Mathematics

Pre-Drift Extension Of The Atlantic Margins Of North America And Europe Based On Paths Of Permo-Triassic Apparent Polar Wander, Myrl E. Beck Jr., Bernard A. Housen Jan 2003

Pre-Drift Extension Of The Atlantic Margins Of North America And Europe Based On Paths Of Permo-Triassic Apparent Polar Wander, Myrl E. Beck Jr., Bernard A. Housen

Geology Faculty Publications

We reconstruct the relative configuration of North America and Europe prior to separation using paths of apparent polar wander (APW) for the interval 300 to 200 Ma. The Bullard et al. (1965) reconstruction closely superimposes the 300 Ma points on the two APW paths but leaves the 200 Ma points far apart. Conversely, anomaly-based reconstructions for later times approximately superimpose the 200 Ma ends of the paths but leave the older ends far apart. This indicates that separation of the interiors of the two continents began during the interval 300 to 200 Ma, long before surficial rifting commenced in the …

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Paleomagnetism Of The Mt. Stuart Batholith Revisited Again: What Has Been Learned Since 1972?, Bernard A. Housen, Myrl E. Beck Jr., Russ R. Burmester Jan 2003

Paleomagnetism Of The Mt. Stuart Batholith Revisited Again: What Has Been Learned Since 1972?, Bernard A. Housen, Myrl E. Beck Jr., Russ R. Burmester

Geology Faculty Publications

We have collected 20 new paleomagnetic sites from the Mount Stuart batholith and the adjacent Beckler Peak stock. Using thermal and low-temperature demagnetization, and rockmagnetic tests, we have found that the remanence in most of the batholith is carried by single-domain magnetite. The mean of the new Mount Stuart batholith sites is D = 354.2°, I = 46.2°, k = 87.2, α95 = 4.6°, N = 11, and is similar to those of the Beck and Noson (1972) and Beck and others (1981) studies. Examination of Ar geochronology of hornblende and biotite from the Mt. Stuart batholith finds that the …

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