Dissertation/Thesis Abstract

A stable isotope and petrographic study of the alkaline volcanic rocks related to continental extension in White Lake Basin of South-Central British Columbia
by Mallory, Marci Deanne, M.Sc., California State University, Long Beach, 2011, 142; 1507693
Abstract (Summary)

White Lake Basin in south-central British Columbia is the location of a well-exposed suite of early Tertiary analcime-bearing alkaline volcanic rocks associated with continental extension. The δ18 O values of these rocks (δ18O = +2.8 to +7.35), closely mirror the Coryell Suite (δ18O = +3.5 to +8.0), proving a cogenetic match between the volcanics and the parent magma. Rapid ascent of magma is confirmed in several petrographic thin section by "seive" textures within the abundant feldspar groups. Mineral assemblages indicate rapid magma ascent at high temperature. End-members of feldspar series show variation from sodic to potassic as the magma ascended, which indicates a primary source more sodic and matching with the cogenetic Coryell Suite. Data analyzed in this study provides proof that the parent magma for the White Lake Basin volcanics is the same material from the intrusive Coryell Suite.

Indexing (document details)
Advisor: Holk, Gregory J.
School: California State University, Long Beach
School Location: United States -- California
Source: MAI 50/04M, Masters Abstracts International
Subjects: Geology, Geochemistry
Publication Number: 1507693
ISBN: 978-1-267-18207-4
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