A geochemical study of trace elements in basalts at Nankivell Point, Nanoose Bay, British Columbia
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Nanoose Bay is currently mapped by the BC Geological Survey (BCGS) as Upper Permian Sicker Group (360-270 ma) of oceanic-arc origin at Nankivell Point in the North, Triassic Karmutsen Formation (237-227 ma) of mid-ocean ridge origin at Ainsley Beach in the south and the Early Jurassic Bonanza plutonic island intrusions (174-201 ma). Contrary to the BCGS geological map, previous VIU geochemical studies at Ainsley Beach exhibit geochemical distinction from the Karmutsen Formation with geochemical signatures indicating a tectonomagmatic evolution from arc-style subduction to extensional rifting with distance from the Jurassic Bonanza. The aim of this study is to prove that the units surrounding the Bonanza intrusion are, in fact, genetically related and to analyze the geochemistry of this lithology to that of regional data for signature correlation. If the basalts within our study area are genetically related, we expect to see a compositional evolution in trace element data from an arc-signature to MORB with distance from the Bonanza intrusion as samples are collected from east to west.