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Subduction Zones. Geosyncline What We Actually See.

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Presentation on theme: "Subduction Zones. Geosyncline What We Actually See."— Presentation transcript:

1 Subduction Zones

2

3 Geosyncline

4 What We Actually See

5 What Does This Look Like?

6

7

8 Andes – True Scale

9 Continent-Continent Collision

10 Continent-Terrane Collision

11 Where Does Ocean Crust Go? Hugo Benioff, How we know plate tectonics happens

12 Benioff’s Interpretation 1. How we know plate tectonics happens

13 Benioff’s Interpretation Updated 1. How we know plate tectonics happens

14 How Plates Move

15 A Subduction Zone

16 Subduction and Metamorphism

17 Why Mountains are High

18 Where the Plates Meet

19 Terrane Accretion

20 Terranes in Western North America

21 Subduction Zone Rocks

22 Steinmann Trinity (1905) Serpentinite Pillow Basalt Radiolarian Cherts Characteristic of ophiolite settings Other Distinctive Rocks – Graywacke and Flysch – Blueschist

23 Bedded Chert

24 Serpentinite

25

26 Magnesite Mines in Serpentinite

27 Pillow Lava

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30 Blueschist

31 Graywacke

32 Flysch

33 Melange

34

35 Eclogite

36 Molasse, Switzerland

37 Molasse and the High Alps

38 Wisconsin 2 Billion Years Ago

39 1900 MY Penokean Orogeny

40 Before the Penokean Orogeny

41 First Collision

42 Second Phase

43 Marshfield Terrane Collides

44 Assembling North America

45

46 1700 MY Granite and Rhyolite

47 Mazatzal Orogeny

48 Cactus Rock

49 Baraboo Interval Quartzites

50 “Baraboo Interval”

51 Yavapai Orogeny

52 Baraboo Quartzite

53 Mazatzal-Yavapai Events

54 1450 MY Wolf River Batholith

55 Wolf River Batholith

56 1100 MY Mid-Continent Rift

57 The Grenville Orogeny Begins

58 The Grenville Orogeny

59 A Subduction Zone

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64 How Arcs Grow

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68 Exotic Terranes

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