2014 GSA Annual Meeting in Vancouver, British Columbia (1922 October 2014)
Paper No. 249-15
Presentation Time: 4:45 PM-5:00 PM


DEWIT, Megan J., Earth Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada, mdewit@sfu.ca, WILLIAMS-JONES, Glyn, Earth Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A1S6, Canada, and VIGOUROUX, Nathalie, Earth and Environmental Sciences, Douglas College, 700 Royal Av, New Westminster, BC V3M5Z5, Canada

Nazko Cone, located in the Nechako basin near Quesnel, British Columbia, is the youngest volcanic member of the Anahim volcanic belt, an eastward-younging field of small volcanic centers related to a hot spot. While the last eruptive activity in the area dates to 7200 BP, an earthquake swarm in 2007 was in all likelihood the result of magma injection into the lower crust. Initial exploration into a possible deeply-circulating/volcanic geothermal system associated with the volcano has revealed geothermal manifestations such as travertine mounds, both fossil and actively forming, and vigorous CO2 degassing (up to 14% concentration in the diluted, diffuse gas) from various vents in two bogs near Nazko Cone. Chemical analyses of the gases collected in pre-evacuated Giggenbach-style bottles indicate that CO2 is the dominant species with minor amounts of CH4 and He (< 1 wt %). Isotopic analyses of the 13CCO2 suggest the gas is mainly of magmatic origin, although additional analyses need to be carried out to fully characterize the emissions. In this regard, a shallow ground temperature and CO2/H2S gas flux survey was performed in the bogs. A Bouguer gravity survey was carried out to map the subsurface structures in the area to determine the relationship, if present, between subsurface structures/geology and the surface manifestations. The high resolution geophysical and geochemical data collected will be modelled in 3D (inverse/forward) in conjunction with pre-existing regional data sets of surficial geology and regional gravity to determine the extent and potential of any geothermal system in the Nazko Cone area.

2014 GSA Annual Meeting in Vancouver, British Columbia (1922 October 2014)
General Information for this Meeting
Session No. 249
Undergraduate Research Talks: The Next Step in Student Research Projects
Vancouver Convention Centre-West: 202/203
1:00 PM-5:00 PM, Tuesday, 21 October 2014

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