1 / 18

Types of Plate Boundaries

Types of Plate Boundaries. Created by Dr. Michael J. Passow. Wegener’s “Continental Drift”. Hypothesis: All continents once joined together as supercontinent PANGAEA. Over millions of years, continents split and moved to present positions (next slide)

elvina
Download Presentation

Types of Plate Boundaries

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Types of Plate Boundaries Created by Dr. Michael J. Passow

  2. Wegener’s “Continental Drift” • Hypothesis: All continents once joined together as supercontinent PANGAEA. • Over millions of years, continents split and moved to present positions (next slide) • Evidence: matching coastlines, fossils, rocks, ancient climates • Weakness: no explanation of continents could move (“driving mechanism”) • Result: rejected for decades

  3. http://www.mapsharing.org/MS-maps/map-pages-worldmap/images-continental/1-continental-pangea-drift.gifhttp://www.mapsharing.org/MS-maps/map-pages-worldmap/images-continental/1-continental-pangea-drift.gif

  4. Emerging Evidence for Plate Tectonics • Mapping the ocean floors using echo-sounding (sonar) records • Paleomagnetism patterns in ocean basalt • Earthquake epicenter patterns • Volcano locations • Hot Spots (ex., Hawaii and the Emperor Seamounts) • Ocean drilling

  5. Continental Drift to Plate Tectonics By the late 1960s, the many lines of geoscience data obtained through developing technologies all provided evidence that: • 1) surface plates existed and • 2) they are moving very slowly in three basic patterns

  6. Divergent/Convergent/Transform plate boundaries http://www.uwsp.edu/gEo/faculty/ozsvath/images/plate_boundaries.htm

  7. Divergent Boundaries(spreading centers) http://www.geology110.com/files/lecshare1/html/web_data/file50.htm

  8. Continental Rift Valleys Perhaps the most famous example is the East African Rift Valley. Eventually, a new ocean may form here. (2- 3 million years ago, humans first evolved here.) http://education.usgs.gov/common/lessons/act5.html

  9. Convergent Boundaries(subduction zones) http://www.geology110.com/files/lecshare1/html/web_data/file51.htm

  10. Ocean-continent convergent boundaries http://sio.ucsd.edu/volcano/about/images/recycle.gif

  11. Most of the Pacific Ring of Fire consists of ocean-continent boundaries http://www.geocaching.com/seek/cache_details.aspx?guid=e83ed03c-349a-4ac5-a91c-a467cb9f92f2

  12. Ocean-ocean convergent boundary Japan http://blue.utb.edu/paullgj/physci1417/Lectures/Plate_Tectonics.html

  13. Continental-continentalconvergent boundary The Himalayas are one of the best examples of this type of boundary. http://www.utexas.edu/tmm/npl/mineralogy/mineral_genesis/index.html

  14. Transform Fault Boundaries http://www.geology110.com/files/lecshare1/html/web_data/file52.htm

  15. http://homepage.ufp.pt/biblioteca/GlossarySaltTectonics/Pages/PageT.htmlhttp://homepage.ufp.pt/biblioteca/GlossarySaltTectonics/Pages/PageT.html

  16. Continental transform fault:San Andreas system • Most transform faults exist in the ocean floor • One important exampleon a continent is the San Andrea system http://geology.com/articles/san-andreas-fault.shtml

  17. Putting It All Together http://www.geology110.com/files/lecshare1/html/web_data/file54.htm

  18. Causes (Driving Mechanisms) for Plate Tectonics • Convection • Slab-Pull and Ridge-Push • Mantle “plumes” • “Whole Mantle” and “Mantle-Core” models

More Related