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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 |
Department: | Geological Sciences |
School Location: | United States -- California |
Source: | MAI 55/05M(E), Masters Abstracts International |
Source Type: | DISSERTATION |
Subjects: | Geochemistry |
Keywords: | British Columbia, Hydrothermal system, Stable isotope |
Publication Number: | 10116161 |
ISBN: | 978-1-339-77629-3 |