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GSA Special Papers
Jurassic Magmatism and Tectonics of the North American Cordillera
Author(s)
Geological Society of America

Volume
299
Copyright:
© 1995 Geological Society of America
Geological Society of America
ISBN print:
9780813722993
Publication date:
January 01, 1995
Book Chapter
Subduction cycles under western North America during the Mesozoic and Cenozoic eras
Author(s)
-
Published:January 01, 1995
An extensive review of geologic and tectonic features of western North America suggests that the interaction of oceanic plates with the continent follows a broad cyclical pattern. In a typical cycle, periods of rapid subduction (7–15 cm/yr), andesitic volcanism, and trench-normal contraction are followed by a shift to trench-normal extension, the onset of voluminous silicic volcanism, formation of large calderas, and the creation of major batholiths. Extension becomes pervasive in metamorphic core complexes, and there is a shift to fundamentally basaltic volcanism, formation of flood basalts, widespread rifting, rotation of terranes, and extensive circulation of fluids throughout the plate margin....
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Index Terms/Descriptors
- accretion
- Alaska
- apparent polar wandering
- asthenosphere
- basaltic composition
- batholiths
- British Columbia
- calderas
- California
- Canada
- Cenozoic
- contraction
- copper ores
- crust
- cycles
- extension tectonics
- faults
- intrusions
- lateral faults
- left-lateral faults
- mantle
- mechanism
- Mesozoic
- metal ores
- metamorphic core complexes
- metamorphic rocks
- Mexico
- movement
- North America
- North American Plate
- obduction
- oceanic crust
- ophiolite
- Oregon
- paleomagnetism
- plate boundaries
- plate collision
- plate rotation
- plate tectonics
- plates
- polar wandering
- pole positions
- porphyry copper
- right-lateral faults
- schists
- siliceous composition
- strike-slip faults
- subduction
- subduction zones
- tectonics
- tectonostratigraphic units
- terranes
- transtension
- United States
- volcanic features
- volcanism
- Washington
- Western Canada
- Yukon Territory
- western North America
Latitude & Longitude
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N60°00'00" - N70°00'00", W141°00'00" - W125°00'00" -
N45°30'00" - N49°00'00", W124°45'00" - W116°55'00" -
N51°00'00" - N72°00'00", W130°00'00" - E173°00'00" -
N48°25'00" - N60°00'00", W139°00'00" - W114°00'00" -
N32°30'00" - N42°00'00", W124°30'00" - W114°15'00" -
N14°30'00" - N32°43'00", W117°00'00" - W86°45'00" -
N42°00'00" - N46°19'60", W124°34'60" - W116°34'60"
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