Chapter 2: Plate Tectonics. Tectonic Plates of Earth. Pangaea. Pangaea: Pan = all Gaea = Earth Panthalassa Thalassa = sea AKA Tethys Sea. Continental Drift. Progressive breakup of Pangaea into modern continents Similar to sea ice. Wegner’s Evidence.
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Identical package of rocks & fossils found in S.Amer., Africa, Australia & Antarctica
Magnetic orientation has 2 dimensions
Dip angle (Inclination)
Curie point (T)
Fossil Magnetism / Paleomagnetism
Magnetization = degrees from N pole
Magnetization + Latitude = 90°
e.g. Lavas from Puerto Rico show 75 ° from N pole & Puerto Rico = 15 ° from equator
Rifts also can form in continental settings
Lakes, valleys, etc.
Asthenosphere thins due to tension
e.g. East Africa Rift Zone, Mt. Kilimanjaro
e.g. Virgin Islands, Japan, Philippines
e.g. Andes, MesoAmerica, Italy