Why is there melting and volcanism at subduction zones?

Slides:

Advertisements

Similar presentations

Divergent boundary Transform fault Convergent boundary Three types of plate boundaries Fig. 1.

Advertisements

You may wonder… Why are the continents moving?. Seafloor Spreading The oceans are widening along the mid- ocean ridges.

Edible Plate Tectonics. TECTONICS: From the Greek “tecton” – builder – architect The study of large features on Earth’s surface and the processes that.

What happens at tectonic plate boundaries?

E ARTH ’ S I NTERIOR AND P LATE T ECTONICS Chapter 19, Section 1 Planet Earth.

Volcanoes and Plate Tectonics

Plate Tectonics. Plate Boundaries  There are 3 main plate boundaries:  1) Convergent Boundary  2) Divergent Boundary  3) Transform Boundary.

Plate Boundaries. Destructive Plate Boundaries Also known as convergent boundaries or compressional boundaries. These cause violent volcanoes and earthquakes,

 Composition: Silicon, Oxygen, and Aluminum  Types: › Continental Crust: solid & rocky outer layer › Oceanic Crust: thin & dense material.

Chapter 8 Volcanoes Section 1, Why Volcanoes Form

Constructive Plate Margins - Revision

TERRA FIRMA Plate interactions. EARTH’S INTERIOR crust under the oceans - basalt (more dense) crust under the continents - granite (less dense) mantle.

IPS COPY THE NOTES THAT ARE IN RED ON YOUR PAPER. COLLECTED TODAY for participation grade points.

Warm Up 11/4 Why are subduction zones not commonly found at convergent continental-continental boundaries? a. Oceanic lithosphere is too buoyant to be.

Aim: Aim: What are the different types of plate boundaries and what are the geologic activities associated with these boundaries? Plate Boundary I.

Paleomagnetism Earth ’ s magnetic field has reversed many times in its history magnetic minerals in lava record direction of Earth ’ s magnetic field when.

Plate Tectonics. What is Plate Tectonics? The Earth’s crust and upper mantle are broken into sections called plates. Plates move around on top of the.

Hess reasoned that if the ocean floor was moving away from either side of the mid- ocean ridge. Then it must be colliding somewhere else, such as the.

Plate tectonics lab. 1 Convergent Boundaries Oceanic to Continental boundary impact - The oceanic plate ALWAYS subducts (goes under) Called Subduction:

Chapter 9: Plate Tectonics

Plate Boundaries.  Earth’s outer layer is divided into many strong, moving lithospheric plates lithospheric Tectonic Plates Plate Tectonics.

Plate Boundaries Lithospheric Plates are pushed and pulled around by the underlying convection cells in the upper mantle (Asthenosphere).

 The lithosphere is broken up into what are called tectonic plates. In the case of Earth, there are currently eight major and many minor plates  Earthquakes,

Obj. 4: Explain the differences between divergent, convergent and transform plate boundaries The plates of the lithosphere move in directions relative.

The Structure of the Earth and Plate Tectonics. Structure of the Earth The Earth is made up of 3 main layers:  Core  Mantle  Crust Inner Core Outer.

Tectonic Plate Boundaries and Their Effects

Plate Movement Chapter 17 Section 3. Plate Tectonics Theory that describes how tectonic plates move and shape Earth’s surface –They move in different.

Mountains. Folded Mountains A folded Mountain is made when rock layers are squeezed and thin it is pushed up. The boundary that made the Folded mountains.

Hazards EXIT A-LEVEL GEOGRAPHY TEACHING AND LEARNING RESOURCES Key terms Epicentre The location on the Earth’s surface that is directly above the earthquake.

Handout 1 Standard 2, Objective 3

8.E.5A.4 Construct explanations for how the theory of plate tectonics accounts for (1) the motion of lithospheric plates, (2) the geologic activities at.

Earthquakes & Plate Tectonics

Plate Tectonics.

Chapter 8 Volcanoes Section 1, Why Volcanoes Form

IN: What force, do you suppose causes the plates to move?

Squeezing the Slab: future directions for metamorphic petrology in the SZO Andrew Smye Sentence about metamorphic petrology and need to link observations.

Handout 3 Standard 2-2 Plate Tectonics.

Lithosphere-Earthquakes Unit

Plate Tectonics.

Lithosphere-Earthquakes Unit

DO NOW Pick up notes sheet..

Plate Tectonics 1: Continental Drift -Evidence of continental drift

Notes on Plate Tectonics

Plate Tectonics Evolution of the Earth.

Aim: How do the plates of the Earth move?

The Origin of Ocean Basins

Notes on Plate Tectonics

2 oceanic plates colliding 3 Types of Plate Boundary Movements

Ocean Currents.

Plate Tectonics The theory that the Earth’s lithosphere is divided into tectonic plates that move around on top of the asthenosphere.

8.E.5A.4 Construct explanations for how the theory of plate tectonics accounts for (1) the motion of lithospheric plates, (2) the geologic activities at.

Review: Earthquakes Topics: Earth’s Layers Earthquakes

Chapter 10 section 2 Plate Tectonics.

6.2 Notes Plate Boundaries

Earth Part 3 G. Yannakoulias.

Earth Part 3 G. Yannakoulias.

Convergent & Transform Boundaries

QUICK REVIEW… Layers of the Earth

Earthquakes & Plate Tectonics

Plate Tectonics.

Section 1 – Inside the Earth

The Unifying Theory of Earth Science

Warm-up Week 13 Day 1 Describe Alfred Weneger’s “Continental Drift” hypothesis in your own words. Give 4 pieces of evidence that support the “Continental.

Restless Earth Lessons 3 and 4 Review.

Continental Drift Alfred Wegener- 1912

Plate Tectonics.

Presentation transcript:

Why is there melting and volcanism at subduction zones? It’s relatively cold!

Hydrous minerals warm up and dehydrate.

Melting at subduction zones Hydration of oceanic floor at MOR More and deeper hydration due to outer rise faults (bending at trench) Dehydration of hydrous minerals Fluid moves up into warmer mantle which melts.

Why are there deep Earthquakes? Normal stress across any fault plane is so high that you would need enormous stresses to cause it to move (i.e. high frictional strength.

Negative volume change reduces friction