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Plate Tectonics Versus Earth Crust Displacement???


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Author Topic: Plate Tectonics Versus Earth Crust Displacement???  (Read 905 times)
Carolyn Silver
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« on: September 27, 2009, 04:50:24 am »

Alfred Wegener (1915)

Proposed that all the continents were originally joined in a single continent (Pangea) that have since drifted apart to their present position. Evidence amassed by Wegener to support this hypothesis included:

    * Geometrical Fit of the Continents - fit continental shelf edges. Positions of India and Madagascar controversial with this approach.
    * Matching Geologic features -
          o Fold Belts - e. g. Applachians - Caledonides
          o Age Provinces - Matching rocks of Paleozoic age, Precambrian as well
          o Igneous Provinces- distinctive igneous provinces correlate across continental boundaries, e. g. Precambrian anorthosites and Mesozoic dolerites
          o Sratigraphic Sections - tillites, coals, seds containing glossopteris that can be correlated across Gondwanaland Metallogenic Provinces - regions containing maganese, iron ore, gold and tin can be correlated across continents.
    * Distribution of late Paleozoic to early Mesozoic Fossils on Land - Many land species found across all the continents (Glossopteris, Mesosaurus), not true later. Isolated landmasses give rise to genetically diverse species.
    * Varied Paleoclimates - Occurrence of sediments from different paleoclimates on same continent suggests that continents have move latitudinally through time.
    * Long Term Fluid-like Behavior of the Mantle - if mantle behaves as a fluid, as vertical movements documented by isostasy suggests, then continents should be able to move through it.
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