Physical Sciences and Mathematics Commons^™

A Pebble Count Comparison And Rock Magnetism Provenance Study Of Sumas Outwash, Jeff Laub

WWU Graduate School Collection

The Sumas Stade, the last of the Fraser Glaciation advances, occurred between 12,000 and 10,000 ¹⁴C years B.P. This study combines previous mapping (Easterbrook, 1976; Haugerud, written communication, 1999) with three new tests to establish a chronology for events of the Sumas Stade. Comparison of compositions of pebbles from Sumas outwash using multivariate statistics such as hierarchical clustering and k-means clustering revealed three major groups of late Sumas outwash and one earlier deposit. Magnetic susceptibility and Curie temperature analysis determined a general British Columbia provenance for the Sumas outwash. Flow direction measurements substantiated this determination. Taken together, these tests …

Petrology And Geochemistry Of Mafic Lavas Near Glacier Peak, North Cascades, Washington, Dylan D. (Dylan Douglas) Taylor

WWU Graduate School Collection

Major element, trace element, and mineral compositions have been determined for four Quaternary mafic monogenetic cinder cones and flows south of Glacier Peak, a dacitic stratovolcano in the northern Cascade arc. The flows are the Whitechuck basalt, and the basaltic andesites of Indian Pass, Lightning Creek, and Dishpan Gap. Whitechuck has high concentrations of AI₂O₃ (≥ 18 wt.%) and low concentrations of K₂O (≤ 0.45 wt.%) and shares similar trace element characteristics with high alumina olivine tholeiites reported in the central and southern Cascades. The three basaltic andesites are calc-alkaline. Indian Pass and Lighting Creek …

Geology Of The Cooper Mountain Pluton, North Cascade Mountains, Washington Based On Magnetic Fabrics, Magnetic Remanence And Petrography, Tammy C. Fawcett

WWU Graduate School Collection

A study of the 48 Ma Cooper Mountain pluton (CMP) in the North Cascade Mountains of Washington using anisotropy of magnetic susceptibility (AMS) defined the orientation of magnetic fabrics. Fabrics in limited areas at the margins of the CMP tend to be parallel to the pluton margin and are therefore interpreted to be emplacement-related. The fabrics in the interior of the body, throughout the bulk of the pluton, are discordant with respect to the NW pluton margin. The fabric is manifest by NW-striking, moderately to steeply dipping foliation and NW-SE trending, moderately to shallowly plunging lineation, approximately parallel to regional …

Changes In Mirror Lake, Northwestern Washington, As A Result Of The Diversion Of Water From The Nooksack River, Karel Tracy

WWU Graduate School Collection

Mirror Lake, a small lake in northwest Washington, has been used as a settling pond for water diverted from the Middle Fork of the Nooksack River since 1962. In this thesis, I combine bathymetric data and sediment sampling to document the changes in sedimentation that have resulted from this diversion, and compare these results to a previous study conducted in 1991.

To document the change in the bathymetry of Mirror Lake since 1991, I surveyed the lake in the summer of 2000 using a theodolite and sonar depth gauge. I compared a contour map generated from this survey to the …

Late Pleistocene Littoral Deposits In The Deming Sand At Bellingham Bay, Washington, And Their Implications For Relative Sea Level Changes, Stacy J. (Stacy Joanna) Weber

WWU Graduate School Collection

Recent mass wasting of sea cliffs along Bellingham Bay in Northwest Washington has exposed late Pleistocene littoral deposits in the Deming sand, which is underlain by Kulshan glaciomarine drift (gmd) and overlain by Bellingham glaciomarine drift (Easterbrook 1963). Marine shells in the Kulshan gmd were dated at 12,210 ± 80 ¹⁴C-yrs B. P. and marine shells in the Deming sand were dated at 11,760 ± 85 and 11,685 ± 85 ¹⁴C-yrs B. P. Marine shells in the Bellingham gmd were dated at 12,150 + 210 ¹⁴C-yrs B. P.

Fossiliferous Kulshan glaciomarine drift is overlain by 11.5 m …