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The Geological History of British Columbia

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Presentation on theme: "The Geological History of British Columbia"— Presentation transcript:

1 The Geological History of British Columbia

2 Geology of Canada

3 Tectonic belts of British Columbia and Yukon

4 Terrane boundaries

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

6 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.

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

8 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.

9 Rocky Mountains Frank Slide

10 Rocky Mountains Burgess Shale

11 Takkakaw Falls Rocky Mountains Jasper Park

12 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.

13 Coast Range Plutonic Complex

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16 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

17 Glacial till exposed at Malaspina University College

18 Glacio-fluvial deposits in Cedar
Glacial striae

19 Post-glacial sea-level rise

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

21 Volcanism in BC

22 Mt. Garibaldi

23 Mt. Price and the Barrier

24 BC Rail quarry – south of Whistler

25 Nazco Cone

26 Tseax River Cone

27 Eve Cone, Edziza area


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