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Date Permissions Signed
Date of Award
Master of Science (MS)
Babcock, R. Scott (Randall Scott)
Housen, Bernard Arthur
The results of a combined magnetic fabric and sedimentological investigation of trench and ridge structures along the foreslope of the Fraser Delta, British Columbia, indicate that turbidity currents are the likely origin of slope morphology. Evidence includes multiple and repetitive sequences of graded beds where trench and ridge structures are most pronounced and abundant. Distal to this region are fewer graded bedding sequences and increased evidence of hemipelagic deposition. A magnetic fabric analysis of cored sediments supports these conclusions. Stereographic projections of AMS ellipsoids from graded beds extracted from the mid-slope display characteristic turbidite relationships, whereas distal cores display hemipelagic relationships. In addition, a relative paleointensity investigation shows that deposition rates in the region of turbidite deposition are nearly an order of magnitude greater than at distal cores dominated by hemipelagic deposition. The results of this investigation suggest a foreslope sedimentation pattern of quiescent deposition punctuated by turbidite events, and evokes turbidites as the prime former of anomalous morphology. When analyzed in conjunction with sedimentological and magnetic results, turbidite influence along the foreslope appears to extend to a depth of approximately 130 meter below sea level.
Foreslope sediments, submarine landslides, Tsunamigenic threat
Western Washington University
Subject – LCSH
Sediments (Geology)--British Columbia--Fraser River Delta; Sedimentation and deposition--British Columbia--Fraser River Delta; Landslide hazard analysis--British Columbia--Fraser River Delta; Turbidity; Tsunamis; Petrofabric analysis
Fraser River Delta (B.C.)
Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this thesis for commercial purposes, or for financial gain, shall not be allowed without the author's written permission.
Wiser, Andrew P. (Andrew Paul), "Magnetic Fabric Analysis of Foreslope Sediments of the Fraser River Delta, British Columbia" (2008). WWU Graduate School Collection. 718.