Dissertation/Thesis Abstract

Stable isotope evidence for a complex fluid evolution of the Northwestern British Columbia Coast Mountains related to terrane accretion
by Moertle, Jasmine A., M.S., California State University, Long Beach, 2016, 133; 10147322
Abstract (Summary)

Stable isotope analysis of thirty-five samples from the Northwestern Coast Mountains indicates a complex fluid history related to terrane accretion, metamorphism, and magmatism. The greenschist to amphibolite facies metasedimentary rocks from the Western Metamorphic Belt have variable δD and δ 18O values that appear to be in isotopic equilibrium with metamorphic fluids at low water-rock ratio conditions. Carbon isotope values indicate organic rich protoliths. Stable isotope values from the Coast Shear Zone indicate the involvement of both magmatic and meteoric-hydrothermal fluids during deformation, in contrast to meteoric-free fluid systems related to Au-mineralization along strike to the north (Goldfarb et al., 1988). The Coast Mountain Batholith and Central Gneiss Complex have homogeneous δD and δ 18O values that indicate magmatic fluids at low water-rock ratio (Magaritz and Taylor, 1976). Further to the east, large amounts of meteoric-hydrothermal fluids circulated through a network of ductile-to-brittle normal faults (Andronicos et al., 2003; Heah, 1990).

Indexing (document details)
Advisor: Holk, Gregory J.
Commitee: Kelty, Thomas, Rusmore, Margaret
School: California State University, Long Beach
Department: Geological Sciences
School Location: United States -- California
Source: MAI 56/01M(E), Masters Abstracts International
Subjects: Geology, Canadian studies, Geochemistry
Keywords: British Columbia, Coast Mountains, Fluid evolution, Prince Rupert, Stable isotopes, Terrane
Publication Number: 10147322
ISBN: 978-1-369-02547-7
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