Coastal & Marine Geology InfoBank

Home FACS Activities Atlas Geology School Related Sites More

USGS CMG InfoBank: Terranes

Skip navigational links
Loading
Dictionaries: Our Mapping Systems   The USGS and Science Education   USGS Fact Sheets   Topics   Keywords   Data Dictionary   Metadata Dictionary   Computer Terminology   Digital Formats  
InfoBank Terms: Activity ID   activity overview   crew   digital data   formal metadata   lines   metadata   NGDC   port stops   project/theme   region   ship   stations   time   virtual globe   year  
Data Types: bathymetry   biological   geochemical   gravity   ground penetrating radar   imaging   LIDAR   logs   magnetics   metering equipment   navigation   samples   seismic   total station   definitions disclaimer  
Data Formats: ARC coverage   E00   FGDC metadata   gridded/image   imaging   material   scattered/swath   Shapefile   vector/polygon  
Comment: 15:08 - 16:02 (00:54)
Source: Annenberg/CPB Resources - Earth Revealed - 7. Mountain Building
Keywords: continent, seamount, "island arc", "Western North America", subduction, "Pacific Ocean", lithosphere, "exotic terrane", "suspect terrane", "accreted terrane", "fault zone", collision

Our transcription: Much of the landscape of Western North America is made up of continental fragments, seamounts and island arcs.
These land masses have attached to the continent during the subduction of Pacific Ocean lithosphere over the past 150 million years.
Such fragments are commonly described by geologists as "exotic, " "suspect, " or "accreted" terranes.
The term "terrane" refers to an area of rocks having continuous strata or structure and a distinctive composition.
The boundary between an accreted terrane and the main body of the continent may be marked by a fault zone or in places by a belt of oceanic rock, which was not subducted but caught in the squeeze between the colliding land masses.

Geology School Keywords
Skip footer navigational links

Coastal and Marine Science Centers:  Pacific   St. Petersburg   Woods Hole  
InfoBank   Coastal and Marine Geology Program   Geologic Information   Ask-A-Geologist   USGS Disclaimer  


Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/06.01.18.html
Page Contact Information: InfoBank staff
Page Last Modified: Thu Oct 31 04:25:57 PDT 2013  (chd)