Stable isotopic analysis of thirty-five samples from the alkaline Coryell Intrusive Suite (CIS) indicate that huge meteoric-hydrothermal systems affected these plutons during emplacement into the shallow crust near the end of Eocene extension in southeastern British Columbia. Significant lowering of δ 18O and δD values and 18O/16O disequilibrium among mineral assemblages from the Arrow Lake, Renata, and Coryell plutons indicate that hydrothermal activity was intense and was active over a ∼300,000 year duration. The absence of geographic trends in δ 18O and δD values indicates that this hydrothermal system was pervasive over a large area (∼3500 km2). Quartz δ 18O values suggest a lower crustal source for the CIS magmas. Melting was triggered by decompression of the lower crust, as it was unroofed during Eocene extension. The overlapping of amphibole and biotite δ 18O values from the CIS and Penticton Group Volcanics suggest a cogenetic relationship between these two units.
|Advisor:||Holk, Gregory J.|
|Commitee:||Francis, Robert D., Melchiorre, Eric|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 55/05M(E), Masters Abstracts International|
|Keywords:||British Columbia, Hydrothermal system, Stable isotope|
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