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Published 1991 | public
Book Section - Chapter

Permian and Triassic Palegeography of the Eastern Klamath Arc and Eastern Hayfork Subduction Complex, Klamath Mountains, California

Abstract

Middle Permian and Middle Triassic volcanic-hypabyssal intrusive complexes form ensimatic arc deposits in the eastern Klamath terrane, northern California. Sedimentary matrix melange with blocks of sand stone, chert, and Tethyan fauna-bearing limestone compose the westward- lying eastern Hayfork terrane. Limestone olistoliths were derived from seamounts and incorporated into a subduction complex that was active during the Late Triassic and probably as early as the Permian. Geologic and biogeographic relations imply a genetic relationship between the ensimatic arc and subduction complex, constraining Permo (?)-Triassic subduction as eastward-dipping.

Additional Information

© 1991 SEPM. J. E. Wright's detailed field studies in the eastern Hayfork terrane set the stage for isotopic studies reported here, and he first recognized the importance of mature quartzose sediment in an oceanic subduction complex. In addition, Wright generously provided Miller with sampling localities. Laboratory studies were supported by NSF Grant EAR 87-08266 awarded to J. B. Saleeby. D.S. Harwood, C. M. Rubin, and J.E. Wright provided helpful reviews.

Additional details

Created:
August 22, 2023
Modified:
January 14, 2024