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Dissertation/Thesis Abstract

Stable isotope evidence for a massive hydrothermal system related to the Coryell Intrusive Suite, British Columbia
by McCarthy, Anne M., M.S., California State University, Long Beach, 2016, 136; 10116161
Abstract (Summary)

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.

Indexing (document details)
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
Subjects: Geochemistry
Keywords: British Columbia, Hydrothermal system, Stable isotope
Publication Number: 10116161
ISBN: 978-1-339-77629-3
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