Petrology, petrogenesis, and tectonic setting of Jurassic rocks of the central Cascades, Washington, and western Klamath Mountains, California-Oregon

This dissertation consists of four independent, yet related projects: (1) the petrology, geochemistry, and original tectonic setting of the Galice Formation, Klamath Mountains, Oregon-California; (2) the geochemistry, tectonic setting, and possible regional correlations of the Iron Mountain and Esmeralda Peaks units of the Ingalls ophiolite complex, central Cascades, Washington; (3) the provenance and original tectonic setting of sedimentary serpentinites and ophiolite breccias within the sedimentary rocks of the Ingalls ophiolite complex; and (4) geology, tectonics, and possible regional correlations of pre-Cenozoic rocks, central Cascades, Washington. This research indicates that the Galice Formation represents continuous Late Jurassic deposition (Oxfordian-Kimmeridgian), within the Josephine backarc basin. Source; areas for the Galice Formation included active Jurassic arcs, older Klamath terranes, and the North American craton. The Early Jurassic Iron Mountain unit of the Ingalls ophiolite complex originated as a seamount in close proximity to an oceanic spreading ridge. The Late Jurassic Esmeralda Peaks unit of the Ingalls ophiolite complex originated in a backarc basin that included a fracture zone. The Iron Mountain unit is the rifted basement of the Esmeralda Peaks unit, and both units correlate to similar rocks within the Klamath Mountains. Cr-spinel compositions, geochemistry, and petrography indicate that sedimentary serpentinites and ophiolite breccias within the Ingalls sedimentary rocks were locally derived. These rocks were originally deposited in a Late Jurassic fracture zone. The Manastash inlier consists of the Hereford Meadow amphibolite, Lookout Mountain Formation, Quartz Mountain stock, and Helena-Haystack mélange. Hereford Meadow amphibolite is, in part, a dismembered pre-Jurassic ophiolite that originated in a supra-subduction zone setting. The Lookout Mountain Formation is Late Jurassic in age, had cratonic sources, and was originally located in the Klamath Mountains region, Oregon-California. The Quartz Mountain stock is Late Jurassic in age, and the remnants of an island arc. The Helena-Haystack mélange is a major suture between Cascade terranes, and suggests that ∼98 km of right-lateral displacement has occurred along the Straight Creek fault. The De Roux unit consists of metaigneous and metasedimentary rocks. Metaigneous rocks have calc-alkaline, within-plate, and mid-ocean ridge basalt affinities. The De Roux unit correlates with other Cascade mélanges

Gas Chromatography for the Undergraduate Student

Gas chromatography has attained a position of prominence as a separation technique and as a tool for qualitative identification and quantitative determination. As such, it should rightly be discussed and applied in the undergraduate curriculum. A gas chromatograph suitable for teaching purposes has been designed and constructed in this laboratory. Experimentation applicable to the undergraduate laboratory is presented

On-Chip Cavity Optomechanical Coupling

On-chip cavity optomechanics, in which strong co-localization of light and mechanical motion is engineered, relies on efficient coupling of light both into and out of the on-chip optical resonator. Here we detail our particular style of tapered and dimpled optical fibers, pioneered by the Painter group at Caltech, which are a versatile and reliable solution to efficient on-chip coupling. First, a brief overview of tapered, single mode fibers is presented, in which the single mode cutoff diameter is highlighted. The apparatus used to create a dimpled tapered fiber is then described, followed by a comprehensive account of the procedure by which a dimpled tapered fiber is produced and mounted in our system. The custom-built optical access vacuum chambers in which our on-chip optomechanical measurements are performed are then discussed. Finally, the process by which our optomechanical devices are fabricated and the method by which we explore their optical and mechanical properties is explained. It is our expectation that this manuscript will enable the novice to develop advanced optomechanical experiments.Comment: 31 pages, 9 figure

Lithics in the West: Using Lithic Analysis to Solve Archeological Problems in Western North America

Lithics in the West seeks to link the rich archaeological lithic data base from the western United States with some of the contemporary theoretical and analytical approaches used in global settings in stone tool and debitage analysis today. The book highlights the role that lithic analysis (in all its forms) plays in solving research problems in the prehistory of western North America. The book covers important archaeological sites and projects in Montana, Wyoming, Idaho, Colorado, and Washington. Contributors include William Andrefsky, Jr., Robert Kelly, Nicole Waguespack, Pei-Lin Yu, Doug MacDonald, Robert Brunswig, Scott Carpenter, Jackie Cook, David Diggs, Philip Fisher, Katie Harris, Brian Ostahowski, Mary Prasciunas, Ken Reid, and Todd Surovell.https://scholarworks.umt.edu/umpress-oabooks/1000/thumbnail.jp