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Paleozoic paleomagnetism and northward drift of the Alexander terrane, southeastern Alaska.

Journal of Geophysical Research

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, , , ,

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Abstract

Paleozoic limestone, greywacke, sandstone, mudstone, red beds and volcanic rocks of the Alexander terrane, SE Alaska, have yielded six paleomagnetic pole positions after thermal and alternating-field demagnetization. These poles are from sample groups of late Middle Ordovician, Late Ordovician, Devonian, Late Devonian, and early and late Carboniferous age. To test various tectonic models for the structural development of this part of western N America, the paleomagnetic results are compared to those for the N American craton. It is found that the observed inclination and declination values deviate significantly from the values predicted for the present-day position of the Alexander terrance (55.5 N, 133.5 W). Better matching can be obtained for a paleoposition of the terrane at about 40 N, 120 W, in the present position of western Nevada and NE California. In addition, an in situ 25o clockwise rotation of the terrane is required to restore it to its original position.-Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Paleozoic paleomagnetism and northward drift of the Alexander terrane, southeastern Alaska.
Series title:
Journal of Geophysical Research
Volume
85
Issue:
B10
Year Published:
1980
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
5281
Last page:
5296
Number of Pages:
16