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Date of Award
Master of Science (MS)
Beck, Myrl E.
Burmester, Russell F.
Babcock, R. Scott (Randall Scott)
The mean direction of remanent magnetism for 44 sampling sites from Oligo-Miocene lava flows in northern California points about 12° east of the expected Oligo-Miocene geomagnetic field direction for the area. Our paleomagnetic data and other data indicate that the Cascade Range has rotated clockwise since the middle Tertiary. Similar, but larger, clockwise rotations have been documented in previous studies throughout the Coast Ranges. Two mechanisms are suggested to account for the differential rotation that has occurred within the Coast and Cascade Ranges. First, the Coast Ranges are rotated and then accreted to a curved continental margin during the Eocene, leaving the Washington Coast Range relatively unrotated at the end of the Eocene. Secondly, during post- Eocene rotation, the thick crystalline crust of the Klamath Mountains prohibited the southern end of the Cascade Range from rotating as rapidly as the northern end, producing an oroclinal bend in the range.
Paleomagnetism, Oligo-Miocene lava flows, Cascade Range
Western Washington University
Western Cascade Range; California
Copying of this thesis in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this thesis for commercial purposes, or for financial gain, shall not be allowed without the author's written permission.
Craig, Douglas Edward, "The Paleomagnetism of a Thick Middle Tertiary Volcanic Sequence in Northern California" (1981). WWU Graduate School Collection. 772.