Structural and fluid evolution of a young accretionary complex: The Hoh rock assemblage of the western Olympic Peninsula, Washington

Дата публикации: 27-08-2026 00:00:00

The Hoh rock assemblage of the western Olympic Peninsula, Washington, was Deposited in Eocene to Miocene time, and accreted, deformed, uplifted, and eroded by the late Miocene. Northeast-dipping fault zones within the Hoh are characterized by intensely deformed mud matrix mélange, and they range from ∼200 m to >1,000 m thick; kinematic indicators within the matrix indicate thrusting to the west-southwest. Both hanging-wall and footwall sections are strongly folded and faulted. Wall-rock sections are lithostratigraphically distinct, with hanging walls composed of massive coarse sandstone and conglomerate, and footwall sections composed of thin- to medium- bedded sandstone and siltstone. Folds within the wall-rock sections are oblique to, and are truncated by, the later fault-zone mélanges, indicating that the fault zones postdate folding. Evidence of fluid involvement in the Hoh rocks includes petroliferous outcrops, carbonate and clay cement, and veins of carbonate and laumontite....

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