Earth Sciences - Theses, Dissertations, and other Required Graduate Degree Essays

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2009 accumulation area ratios and little ice age equilibrium line altitude depression of Mount Baker glaciers, Washington state, USA

Date created: 
2011-10-04
Abstract: 

Measurements made from a 2009 NAIP (National Agriculture Imagery Program) orthoimage covering the Mount Baker area indicate that 2009 was a negative mass balance year: On average, the accumulation areas of the glaciers occupied only 37 percent of total glacier area at the end of August. An accumulation area of at least 62 percent is required for Mount Baker glaciers to be in equilibrium. Through the use of spreadsheet models, the modern and Little Ice Age thicknesses of these glaciers are compared. During the Little Ice Age, glaciers on Mount Baker were, on average, 1.6 times larger and approximately 20 m thicker than present. The equilibrium line altitudes of these glaciers were, on average, 300 m lower at the maximum of the Little Ice Age than today. The average ablation season temperature was about 2.0°C lower at the peak of the Little Ice Age than today, assuming that precipitation was 7% greater at that time.

Document type: 
Thesis
File(s): 
Senior supervisor: 
John Clague
Department: 
Science: Department of Earth Sciences
Thesis type: 
(Thesis) M.Sc.

Investigation of the iron-oxide mineralization at the Iron Range, Southeastern BC

Author: 
Date created: 
2011-08-26
Abstract: 

The Iron Range iron oxide occurrence in south eastern British Columbia consists of massive lenses and veins of hematite and martite with lesser magnetite that pinch and swell along the Iron Range fault zone. It is hosted within the Proterozoic Aldridge Formation and Moyie Sills and forms a central massive iron-oxide corridor flanked by albite-quartz iron-oxide breccia. The most common alteration assemblage is albite-chlorite-hematite-magnetite +/- silica, which is locally overprinted by later iron-oxide, silica, sericite or carbonate alteration. Oxygen isotope analyses in conjunction with fluid inclusions indicate precipitation temperatures for the mineralized zones in the range 340 to 400 °C and 1750 to 4500 bars. The Iron Range iron oxide mineralized rock shares many characteristics of major IOCG deposits and alkali porphyry systems, however the exposed rocks lack economic Cu (+-Au)-concentration. Magnetite trace element chemistry is consistent with IOCG and porphyry mineralization worldwide and recent drilling intersected minor sulphide (chalcopyrite and pyrite) and gold mineralization at 200 m and 20 m depths, respectively. Paleomagnetic studies in conjunction with Ar-Ar dating of regional (magnetite-rich) intrusions support a Cretaceous hydrothermal event responsible for the alteration and mineralization at the Iron Range.

Document type: 
Thesis
File(s): 
Senior supervisor: 
Daniel Marshall
Department: 
Science: Department of Earth Sciences
Thesis type: 
(Thesis) M.Sc.

Cenozoic drainage history of southern British Columbia

Author: 
Peer reviewed: 
No, item is not peer reviewed.
Date created: 
2004
Document type: 
Thesis
File(s): 
Senior supervisor: 
John Clague
Department: 
Science: Department of Earth Sciences
Thesis type: 
(Dissertation) Ph.D.

Facies architecture and stratigraphy of the Paleogene Huntingdon Formation at Abbotsford, British Columbia

Peer reviewed: 
No, item is not peer reviewed.
Date created: 
2003
Document type: 
Thesis
File(s): 
Senior supervisor: 
Peter Mustard
Department: 
Science: Earth Sciences
Thesis type: 
Thesis (M.Sc.)

The role of aquifer heterogeneity in saltwater intrusion modeling, Saturna Island, B.C., Canada

Author: 
Peer reviewed: 
No, item is not peer reviewed.
Date created: 
2003
Document type: 
Thesis
File(s): 
Senior supervisor: 
Diana Allen
Department: 
Science: Earth Sciences
Thesis type: 
Thesis (M.Sc.)

3-D seismic traveltime tomography acroos the Red Lake greenstone belt using LITHOPROBE Western Superior line 2B

Author: 
Peer reviewed: 
No, item is not peer reviewed.
Date created: 
2004
Document type: 
Thesis
File(s): 
Senior supervisor: 
Andrew Calvert
Department: 
Science: Department of Earth Sciences
Thesis type: 
(Thesis) M.Sc.