Thesis
Volcanogenic sedimentation and volcano-tectonic evolution of the Clarno formation in the Blue Mountains regions, NE Oregon
Washington State University
Master of Science (MS), Washington State University
2013
Handle:
https://hdl.handle.net/2376/104618
Abstract
The eastern part of the Eocene Clarno Formation in the Pogue Point 7.5’ quadrangle contains evidence for extensive volcanogenic debris- and hyperconcentrated-flow processes that provides insight into the sedimentary and volcano-tectonic evolution of a part of the Blue Mountain Province in NE Oregon. The Clarno Formation in the Pogue Point area is characterized by volcanic debris- and hyperconcentrated-flow deposits that were subsequently reworked by tractional processes inherent to stream flow. Geochemical analyses from Clarno Formation samples collected in the Pogue Point quadrangle indicate that this succession correlates with a previously defined “upper sequence” of the Clarno Formation west of Pogue Point. Vertical trends identified from clasts lithologies in Pogue Point suggest that dacite source rocks dominate the lower third of the Clarno succession whereas basaltic andesite and andesite sources dominate the upper 2/3rds of the succession. The dominance of gravel facies and the presence of intra-channel lavas in the Pogue Point Clarno deposits suggest they were proximal to their sources. Paleocurrents interpreted from planar- and trough- cross strata indicate sources located south of the quadrangle. Facies variability, the tabular planar nature of deposits, and the widespread spatial extent of the Clarno deposits suggests deposition occurred primarily on broad, braided alluvial plains. The contact relations between the Clarno Formation and younger Miocene Dinner Creek Tuff and Strawberry Volcanics indicate a rolling and variably channelized topography with the development of at least 30 m of relief following Clarno deposition. The Miocene Dinner Creek Tuff and the Strawberry Volcanics overlie the Clarno Formation in the Pogue Point quadrangle and, like the Clarno, both have source vents located south of the quadrangle.
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Details
- Title
- Volcanogenic sedimentation and volcano-tectonic evolution of the Clarno formation in the Blue Mountains regions, NE Oregon
- Creators
- Kristopher Jerome Felt
- Contributors
- David R. Gaylord (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Environment, School of the (CAHNRS)
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525103401842
- Language
- English
- Resource Type
- Thesis