Theory of Plate Tectonics ll

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Presentation transcript:

Theory of Plate Tectonics ll By: Enrico Romeo F. Abanales References: whybecausescience.com

What evidences do we now have for the Theory of Plate Tectonics? Fossil Distribution existence of plate tectonics discovery of very similar fossils Examples: India: Triassic land reptile; Lystrosaurus South America: Triassic land reptile; Cynognathus Freshwater reptile; Mesosaurus Antartica: fern; Glossopteris References: http://hyperphysics.phy-astr.gsu.edu/hbase/geophys/platevid.html

Lystrosaurus fossil References: en.wikipedia.org

Cynognathus References: www.snipview.org

Mesosaurus References: commons.wikimedia.org

Glossopteris fossil References: commons.wikimedia.org

Paleomagnetism Iron-rich magnetic minerals Ferromagnetism Solidifying Magnetite present in basaltic lava flow Ferromagnetism Curie temperature; 1043K 850 K (580°C); magnetite Solidifying slightly magnetized direction of Earth's magnetic field References: http://hyperphysics.phy-astr.gsu.edu/hbase/geophys/platevid.html

What drives the plates? Harry Hess' theory 1930s by Arthur Holmes plate-driving force slow movement of hot, softened mantle rigid plates 1930s by Arthur Holmes English geologist seafloor spreading circular motion continents conveyor belt References: http://pubs.usgs.gov/gip/dynamic/unanswered.html

Earth; solid, motionless body J. Tuzo Wilson 1968 "The earth, instead of appearing as an inert statue, is a living, mobile thing." Earth's surface interior lithospheric plates mantle molten steady forces References: http://pubs.usgs.gov/gip/dynamic/unanswered.html

Slab Pull Slab Pull slab pull force subducting plate mantle primary force collisional zones (Wilson, 1993) slab pull force subducting slab circulation patterns dominant force (Conrad and Lithgow-Bertelloni, 2002) References: http://www.geosci.usyd.edu.au/users/prey/ACSGT/EReports/eR.2003/GroupD/Report1/web%20pages/Driv_tectonics .html

References: www.haikudeck.com

Ridge Push leading contributor Bott (1991) slab pull slab pull acting two main models of ridge push Bott (1991) 'gravity wedging' 'gravity sliding‘ dominant model References: http://www.geosci.usyd.edu.au/users/prey/ACSGT/EReports/eR.2003/GroupD/Report1/web%20pages/Driv_tectonics .html

Ridge Push References: www.haikudeck.com

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