The Geological History of British Columbia

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Presentation transcript:

The Geological History of British Columbia

Geology of Canada

Tectonic belts of British Columbia and Yukon

Terrane boundaries

Possible locations of various Cordilleran terranes during the Permian (ie. prior to 250 m.y.)

Passive margin A passive ocean-continent margin existed from around 700 m.y to around 200 m.y. ago. A thick sequence of sediments – clastics and limestones -accumulated in this time.

Subduction Subduction of oceanic plate beneath North America. Subduction-related volcanism existed. Approach of micro-continents from the southwest.

Intermontane Super-terrane Accretion of the Intermontane Super-Terrane and consequent thrusting and folding of existing sedimentary rocks into the Rocky Mountains. Approach of more micro-continents. Subduction related volcanism and intrusive bodies. The Intermontane terrane is mostly volcanic and sedimentary rocks that formed a long way away.

Rocky Mountains Frank Slide

Rocky Mountains Burgess Shale

Takkakaw Falls Rocky Mountains Jasper Park

Coast range plutonic complex Formation of the Coast Range Plutonic Complex. Accretion of the Insular Super Terrane. Ongoing subduction of the Juan de Fuca Plate beneath B.C., Washington and Oregon. Further uplift of the Rocky Mountains.

Coast Range Plutonic Complex

Wide-spread glaciation started around 2.5 m.y. ago Extent of ice cover at the height of the last glacial advance (ca. 14,500 years b.p.). Ice was up to 3000 m thick in central B.C., 2000 m on Vancouver Island

Glacial till exposed at Malaspina University College

Glacio-fluvial deposits in Cedar Glacial striae

Post-glacial sea-level rise

Present-day plate distribution along the western coast of the US and Canada

Volcanism in BC

Mt. Garibaldi

Mt. Price and the Barrier

BC Rail quarry – south of Whistler

Nazco Cone

Tseax River Cone

Eve Cone, Edziza area

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