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Olympic Mountain Formation

Olympic Mountain Formation. Processes. 1. Subduction of Juan de Fuca Plate 2. Accretionary Wedge of Mudstones, limestone, sandstones and conglomerates 3. Obduction of oceanic crust 4. Rising of sediments through oceanic crust (the pimple hypothesis). 1. Subduction of Juan de Fuca Plate.

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Olympic Mountain Formation

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  1. Olympic Mountain Formation

  2. Processes • 1. Subduction of Juan de Fuca Plate • 2. Accretionary Wedge of Mudstones, limestone, sandstones and conglomerates • 3. Obduction of oceanic crust • 4. Rising of sediments through oceanic crust (the pimple hypothesis)

  3. 1. Subduction of Juan de Fuca Plate 2. Accretionary Wedge of Mudstones, limestone, land sediments

  4. 3. Obduction of oceanic crust • Some Oceanic Crust Lifted OVER Accretionary Sediments Oceanic Crust

  5. 4. Rising of sediments through oceanic crust (the pimple hypothesis) Accretionary Sediments are less Dense and rise up through Basaltic Oceanic Crust Oceanic Crust Basaltic Crust erodes, now only located as a donut around east and North edges

  6. Brandon, Roden-Tice & Garver, 1998, Late Cenozoic exhumatition of the Cascadia accretionary wedge in the Olympic Mountains, NW Washington State: Bull. Geol. Soc. America, v. 110, p. 985-1009.

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