(L03)Introduction_to_Plate_Tectonics_E10

(L03)Introduction_to_Plate_Tectonics_E10 - Introduction to...

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1 Introduction to Plate Tectonics A Revolution in the Earth Sciences - Peter Wyllie GLY 2010 – Summer 2010 Lecture 3
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2 Alfred Wegener, 1880-1930 German meteorologist Published a book in 1915 whose (translated) title is The Origin of Continents and Oceans Wegener proposed the idea of Continental Drift
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3 Continental Drift Pangaea – supercontinent containing all land Based on evidence available in early 1900’s
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Wegener’s Evidence Fit of continents when map cut apart and rearranged Climate similarities in adjacent areas 4
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5 Lithologic (Rock) Evidence Unusual rocks found only where continents fit together Cratons – cores of continents, strongly showed this pattern Karoo (South Africa) and Santa Catarina (Brazil) formations appear identical
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Fossil Evidence Glossopteris had left leaf remains in large areas of Southern Hemisphere Wegener concluded that southern continents must have been joined 6
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7 Fate of Continental Drift Hypothesis Biggest objection: How to move a continent? Wegener died in Greenland in 1930 – before most people accepted his ideas Wegener’s ideas languished until the end of WWII Use of submarines during the war spurred research after the war This lead to oceanographic exploration
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8 Oceanographic Exploration Ocean floors were mapped to add submarine navigation Knowledge gained revitalized Wegener’s ideas
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(L03)Introduction_to_Plate_Tectonics_E10 - Introduction to...

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