Paleomagnetism of the Devonian Kennett Limestone and the rotation of the eastern Klamath Mountains, California

Details Paleomagnetism of the Devonian Kennett Limestone and the rotation of the eastern Klamath Mountains, California Paleomagnetism of the Devonian Kennett Limestone and the rotation of the eastern Klamath Mountains, California

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..61..365a&link_type=abstract

Earth and Planetary Science Letters, Volume 61, Issue 2, p. 365-380.

Mathematics

21

Scientific paper

The Devonian Kennett Limestone in the Eastern Klamath terrane in northern California has a stable magnetization that was acquired after the folding of the formation apparently in the very early Cretaceous. The mean paleomagnetic vector has the direction I = -49°, D = 219°, A95 = 7.2° and the parameters of the corresponding paleomagnetic pole are latitude = 57°, longitude = 332°, A95 = 7.4°. All of the stably magnetized specimens have a single polarity. We propose that the magnetization be associated with the emplacement of the Shasta Bally batholith during the M17 reversed interval at 134 Ma. The firmest conclusion that can be drawn from these data is that the Eastern Klamath terrane has undergone 70 +/- 11° of clockwise rotation, since the Early Cretaceous. This result does not support earlier tectonic models in which either the entire Klamaths or terranes on the south side of the Klamaths rotated in a counterclockwise sense. The close agreement between the amount of clockwise rotation and that observed in the Oregon Coast Range to the north of the Klamaths suggests that both may reflect the same tectonic process. The data may suggest a few hundred kilometers of northwestward translation of the terrane since the Early Cretaceous.
Present address: Chevron U.S.A., P.O. Box 599, Denver, CO 80201, U.S.A.

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