the geology & geological history of vancouver island steven earle
TRANSCRIPT
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The Geology & Geological History of
Vancouver Island
Steven Earle
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Myra Falls Mine
Devonian (Sicker Group) Rocks
Dyke in pillow basalt
Chert overlain by Cretaceous conglomerate
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Metamorphic and igneous rocks of Wrangellia in Victoria
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Karmutsen Formation
(Triassic) sea-floor pillowed basalt
Quatsino Formation
limestone (with a mafic dyke).
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Jurassic aged Island
Intrusion granite with a
quartz-feldspar vein
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Wrangellia was accreted onto N.A. around 100 m.y. ago
N.A.
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Nanaimo Group (65-
85 m.y.)
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In total the Nanaimo Group is roughly 5000 m thick.
The oldest rocks may be as old as 92 m.y. but most basal units, such as the Malaspina Cut, are no more than 86 m.y.
The youngest rocks are probably more than 65 m.y. old, but could be younger.
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Sub-marine fan deposition for most of the Nanaimo Group, but not the lower part.
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Nanaimo Group (Cretaceous) Sandstone,
mudstone, comglomerate
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The City of Nanaimo exists because of coal mining, which took place from around 1850 to 1950. It could be argued that this is also why
British Columbia is part of Canada.
The only coal mining at present is from the Quinsam mine (below) near to Campbell River.
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Leech River Complex (Pacific
Rim Terrane) Phyllite at Niagara
Falls
and at the Chinese Cemetery in
Victoria
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Crescent Terrane Tertiary,
Metchosin Igneous Complex, Sea-floor pillowed
basalt
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Continued compression of western North America Up-thrusting of Nanaimo Group Rocks onto
Vancouver Island
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Cross-section from the edge of the North American plate at the subduction front, across
Vancouver Island to the Strait of Georgia