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Canada United States Accreted terranes Island arc Sonoma Terrane |Submarine deposits North American Craton Ancient ocean floor Displaced continental United States fragments Меxico 600 km Figure 3.33 North American terranes. These fragments have differing histories and origins. Some have moved thousands of kilometers to be scraped off onto the North American core as their transporting plate subducted. Gujweajobebuag o Wrangelia Terane Seamount or inactive Oceanic plateau oceanic ridge or microcontinent Accretion Accretion Faults Oceanic crust Upper mantle Asthenosphere Exotic terranes Figure 3.32 Terrane formation. Oceanic plateaus usually composed of relatively low-density rock are not subducted into the trench with the oceanic plate. Instead, they are "scraped off," causing uplifting and mountain building as they strike a continent (a-d). Though rare, assemblages of subducting oceanic lithosphere can also be scraped off (obducted) onto the edges of continents. Rich ore deposits are some- times found in them.

Canada United States Accreted terranes Island arc Sonoma Terrane |Submarine deposits North American Craton Ancient ocean floor Displaced continental United States fragments Меxico 600 km Figure 3.33 North American terranes. These fragments have differing histories and origins. Some have moved thousands of kilometers to be scraped off onto the North American core as their transporting plate subducted. Gujweajobebuag o Wrangelia Terane Seamount or inactive Oceanic plateau oceanic ridge or microcontinent Accretion Accretion Faults Oceanic crust Upper mantle Asthenosphere Exotic terranes Figure 3.32 Terrane formation. Oceanic plateaus usually composed of relatively low-density rock are not subducted into the trench with the oceanic plate. Instead, they are "scraped off," causing uplifting and mountain building as they strike a continent (a-d). Though rare, assemblages of subducting oceanic lithosphere can also be scraped off (obducted) onto the edges of continents. Rich ore deposits are some- times found in them.

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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What connection might there be between this complex seabed and the formation of terranes (As Shown)?

Canada United States Accreted terranes Island arc Sonoma Terrane |Submarine deposits North American Craton Ancient ocean floor Displaced continental United States fragments Меxico 600 km Figure 3.33 North American terranes. These fragments have differing histories and origins. Some have moved thousands of kilometers to be scraped off onto the North American core as their transporting plate subducted. Gujweajobebuag o Wrangelia Terane
Transcribed Image Text:Canada United States Accreted terranes Island arc Sonoma Terrane |Submarine deposits North American Craton Ancient ocean floor Displaced continental United States fragments Меxico 600 km Figure 3.33 North American terranes. These fragments have differing histories and origins. Some have moved thousands of kilometers to be scraped off onto the North American core as their transporting plate subducted. Gujweajobebuag o Wrangelia Terane
Seamount or inactive Oceanic plateau oceanic ridge or microcontinent Accretion Accretion Faults Oceanic crust Upper mantle Asthenosphere Exotic terranes Figure 3.32 Terrane formation. Oceanic plateaus usually composed of relatively low-density rock are not subducted into the trench with the oceanic plate. Instead, they are "scraped off," causing uplifting and mountain building as they strike a continent (a-d). Though rare, assemblages of subducting oceanic lithosphere can also be scraped off (obducted) onto the edges of continents. Rich ore deposits are some- times found in them.
Transcribed Image Text:Seamount or inactive Oceanic plateau oceanic ridge or microcontinent Accretion Accretion Faults Oceanic crust Upper mantle Asthenosphere Exotic terranes Figure 3.32 Terrane formation. Oceanic plateaus usually composed of relatively low-density rock are not subducted into the trench with the oceanic plate. Instead, they are "scraped off," causing uplifting and mountain building as they strike a continent (a-d). Though rare, assemblages of subducting oceanic lithosphere can also be scraped off (obducted) onto the edges of continents. Rich ore deposits are some- times found in them.
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