THE THEORY OF PLATE TECTONICS

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Presentation transcript:

THE THEORY OF PLATE TECTONICS

INTRODUCTION Tectonics- large scale deformational features of the crust Plate tectonics Earth’s outer shell divided into plates Plates move & change in size thru time

INTRODUCTION Ideas Continental drift- Alfred Wegener

Early Case for Continental Drift- Alfred Wegener (F. B. Taylor & H. H Early Case for Continental Drift- Alfred Wegener (F.B. Taylor & H.H. Baker) Continental coastlines fit together 1620 Sir Francis Bacon: Africa and S. America Rocks & structures indicated that continents joined Pangea- supercontinent of the late Paleozoic Separated into Laurasia & Gondwanaland Fossil evidence- Glossopteris & Mesosaurus Late Paleozoic glaciation Skepticism about Continental Drift Problem of driving mechanism

Continental Drift Alfred Wegener 1912 Pangaea (ALL EARTH) Evidence: Continents FIT together like the pieces of a puzzle Fossils Rocks & structures Paleoclimate

Continental Drift Alfred Wegener 1912 Pangaea (ALL EARTH) Evidence: Continents FIT together like the pieces of a puzzle Fossils Rocks and structures Paleoclimate

Continental Drift Alfred Wegener 1912 Pangaea (ALL EARTH) Evidence: Continents FIT together like the pieces of a puzzle Fossils Rocks and structures Paleoclimate

Evidence for Continental Drift- Revisited Fitting continents at continental slope rather than shoreline- 1000m depth Refined matches of rocks between continents Isotopic ages support matches Glacial evidence Matches between Africa and South America are particularly convincing