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Plate Tectonics. Major Divisions of Earth Plate Tectonics.

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Presentation on theme: "Plate Tectonics. Major Divisions of Earth Plate Tectonics."— Presentation transcript:

1 Plate Tectonics

2 Major Divisions of Earth Plate Tectonics

3 Different Properties Plate Tectonics

4 Rigid Plate Tectonics Plastic

5 The outer layer is the thinnest = Crust Two kinds of Crust Plate Tectonics

6 continental crust : thicker, light (granite) oceanic : thinner, dense (basalt) Plate Tectonics 2.7g/cm³ 3.3 g/cm³

7 Each Tectonic Plate: Oceanic crust or Oceanic & Continental crust Plate Tectonics

8 Each Tectonic Plate: Oceanic crust or Oceanic & Continental crust (none with continent only) Plate Tectonics

9 Oceanic crust or Oceanic & Continental crust Plate Tectonics

10 Active continental margin: leading edge of plate (earthquakes, volcanoes, steep mountains) Plate Tectonics

11 Passive continental margin: trailing edge of continent (eroded mountains, flat plains, little activity) Plate Tectonics

12

13 Active margin Passive margin

14 Plate Tectonics Classification of Plate Boundaries

15 Plate Tectonics I. Divergent Boundaries : tension = pull  apart normal faults

16 Plate Tectonics I. Divergent Boundaries : tension = pull  apart normal faults

17 Plate Tectonics I. Divergent Boundaries : new ocean crust formed mid-ocean ridge with a rift valley down the middle

18 Plate Tectonics I. Divergent Boundaries : young basin

19 Plate Tectonics I. Divergent Boundaries : mature basin

20 Plate Tectonics I.Convergent Boundaries : compression = push  together reverse faults

21 Plate Tectonics I.Convergent Boundaries : compression = push  together reverse faults

22 Plate Tectonics I.Convergent Boundaries : folding & uplift earthquakes

23 Plate Tectonics Three kinds of Convergent Margins (Crust Type) oc - oc oc - cont. cont. - cont.

24 Plate Tectonics IIa. Ocean - Ocean deep sea trench subduction zone (recyle) volcanoes & uplift

25 Aleutians, Japan, Philippines, Indonesia

26 Plate Tectonics IIb. Ocean - Continent deep sea trench subduction zone (recycle ocean side) volcanoes & major uplift

27 Plate Tectonics IIb. Ocean - Continent

28 Andes, Cascades

29 Plate Tectonics IIc. Continent - Continent collision no subduction, no vulconism (can't recyle continents) heat & pressure, folding & major uplift

30 Plate Tectonics IIc. Continent - Continent

31 Himalayas

32 Plate Tectonics III. Transform Plate boundaries shear = sliding past in opposite directions lateral movement with earthquakes

33 Plate Tectonics III. Transform Plate boundaries California San Andreas fault


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