Chapter 14: Convergent Boundaries

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Chapter 14 Convergent Boundaries
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Introduction

• Orogenesis
• Mountain building
• Orogeny
• Mountain building event (AKA collision)
• Isostasy
• Gravitational balance of crust with mantle
• Isostatic adjustment
• Changes in buoyancy due to removal or addition of
  material

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Principle of Isostasy
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Isostatic Adjustment
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Convergence Subduction

• A) Volcanic island arc
• AKA Island arc
• B) Continental arc

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Dynamics at Subduction Zones
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Subduction Mountain Building
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Accretion of Island Arc
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Case Study Western North America
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Continental Collisions

• Compressional Mountains
• Fold Thrust Belt
• e.g. Himalaya

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India-Asia Collision
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Fault Block Mountains
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Basin Range, Nevada
http//www.teachingboxes.org/mountainBuilding/less
ons/faultImages/index.html
14
How Continents Grow