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 & AntarcticaMesozoic Supergroup
Magnetic orientation has 2 dimensions Africa, Australia & Antarctica
Dip angle (Inclination)
Curie point (T)
Fossil Magnetism / PaleomagnetismN-S Orientation & Dip
Magnetization = degrees from N pole Africa, Australia & Antarctica
Magnetization + Latitude = 90°
e.g. Lavas from Puerto Rico show 75 ° from N pole & Puerto Rico = 15 ° from equatorMagnetic Inclination
Rifts also can form in continental settings Africa, Australia & Antarctica
Lakes, valleys, etc.
Asthenosphere thins due to tension
e.g. East Africa Rift Zone, Mt. KilimanjaroContinental Rifting
e.g. Virgin Islands, Japan, Philippines
e.g. Andes, MesoAmerica, Italy