Graduate Thesis Or Dissertation
 

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/sf268930p

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  • The purpose of this investigation was to test two hypotheses. The first hypothesis interprets allochthonous rocks in the southern Pinyon Range to lie on the Devonian Nevada Group. The second hypothesis interprets allochthonous rocks to lie on the Mississippian Dale Canyon Formation. Evidence presented here supports the second hypothesis. During Late Silurian to Middle Devonian time, deposition in the southern Pinyon Range occurred in a miogeoclinal shallow shelf environment characterized by the Lone Mountain Dolomite and Nevada Group. Deposition of the Pilot Shale in an incipient basin developed within the shelf, beginning no later,than marginifera-Lower velifer Zone time, marked the onset of the Antler orogeny. A westward-dipping subduction zone formed to the west, developing an accretionary wedge which later became the Roberts Mountains allochthon. Incipient subduction of continental crust resulted in obduction of the allochthon onto the continential crust. The Antler foreland basin formed east of the advancing allochthon where deposition of the Dale Canyon Formation unconformably on the Pilot Shale formed a submarine fan complex consisting of siliciclastic sediments shed from the rising allochthon. The Roberts Mountains allochthon in the southern Pinyon Range consists of the Devonian Woodruff Formation forming the base, the Ordovician Vinini Formation thrust over the Woodruff, with slices of the Devonian Roberts Mountains Formation occurring in between at places. The allochthon was emplaced in the southern Pinyon Range, over the Dale Canyon Formation during or after late isosticha-Upper crenulata Zone time.
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