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Implications of paleomagnetism for the tectonic history of the Eastern Klamath and related terranes in California and Oregon

Pacific Section S.E.P.M.
By: , and 
Edited by: T.H. Nilsen

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Abstract

Paleomagnetic study of Permian to Jurassic volcanic and sedimentary strata of the Eastern Klamath terrane has shown the remanent magnetism of these rocks to be prefolding and primary. The Permian and Triassic rocks are both indicated to have rotated 100° clockwise, while the Jurassic strata have rotated 60° clockwise. The respective amounts of rotation for Permian and Jurassic strata are similar along two widely-spaced transects of the arcuate Eastern Klamath terrane, which indicates rigid-block rotation rather than oroclinal bending. These results suggest that the Permian and Triassic strata began to rotate during Late Triassic or Early Jurassic time, possibly in response to the beginning of accretion of the Eastern Klamath terrane to the continental margin. Measurements on superjacent Cretaceous strata indicate that the rotation of the Eastern Klamath terrane as well as other parts of the Klamath Mountains province was virtually compete by Early Cretaceous time. The virtual cessation of rotation probably marked the completion of the accretion of the Eastern Klamath terrane to North America. Neither these nor other data currently available show evidence for any significant latitudinal displacement of the Klamath Mountains terranes.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Implications of paleomagnetism for the tectonic history of the Eastern Klamath and related terranes in California and Oregon
Series title Pacific Section S.E.P.M.
Volume 42
Year Published 1984
Language English
Contributing office(s) Geology, Minerals, Energy, and Geophysics Science Center
Description 9 p.
Larger Work Title Geology of the Upper Cretaceous Hornbrook Formation, California and Oregon
First page 221
Last page 229