Thesis
Degassing and eruption at a phreatomagmatic vent for the Wapshilla Ridge member of the Grande Ronde Basalt, NE Oregon
Washington State University
Master of Science (MS), Washington State University
2012
Handle:
https://hdl.handle.net/2376/101771
Abstract
Degassing at volcanic centers produces climate-altering gases and flood basalt provinces have the potential to produce widespread and persistent environmental impacts. This study presents new data for volatile content in lapilli and glassy melt inclusions for a phreatomagmatic vent of the Wapshilla Ridge Member of the Grande Ronde Basalt of the Columbia River Flood Basalt Province, located in Northeastern Oregon. We find that glassy melt inclusions contain up to 1890 ppm sulfur and the most degassed lapilli contain 240ppm sulfur. Several inclusions are partially degassed, indicating contemporaneous crystallization and volatile exsolution during magma rise. Using the highest sulfur inclusion and most degassed lapilli we find that degassing of the Wapshilla Ridge Member produced nearly 180,000 Tg of sulfur and was capable of injecting volatiles into the Stratosphere, likely resulting in severe and widespread environmental impacts. We evaluate the nature of the eruption and, finally we compare this data with the sulfide saturation model of Blake et. al., (2010) and find that sulfur constrained by this method is several parts per million higher than predicted by the model.
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Details
- Title
- Degassing and eruption at a phreatomagmatic vent for the Wapshilla Ridge member of the Grande Ronde Basalt, NE Oregon
- Creators
- Klarissa Nicole Davis
- Contributors
- John A. Wolff (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, Wash. :
- Identifiers
- 99900525169701842
- Language
- English
- Resource Type
- Thesis