Effect of erosion on mountain building
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Effect of erosion on mountain building. Background on work budget Background on erosion Erosion exercise Data analysis. whatever. Do fault systems evolve in order to minimize the total work?. Is the Earth Lazy?. Evidence of lazy Earth.

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Effect of erosion on mountain building

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Effect of erosion on mountain building

Effect of erosion on mountain building

Background on work budget

Background on erosion

Erosion exercise

Data analysis


Is the earth lazy

whatever

Do fault systems evolve in order to minimize the total work?

Is the Earth Lazy?


Evidence of lazy earth

Evidence of lazy Earth

Geometry of spreading centers [Sleep, 1979] and mudcracks reflects work minimization

  • Faults become more smooth with greater slip

    • Strike-slip traces [e.g. Wesnousky, 1988], extensional fault traces [Gupta et al., 1998], and lab [Scholz, 1990].


Forces within wedges

Forces within wedges


Work terms

Work terms


Underthrust accretion cycle

Underthrust-Accretion Cycle

  • Accretion: new forethrust

  • Underthrusting

  • Accretion: new forethrust

  • Underthrusting


Sandbox experiments

Sandbox experiments

  • Adams et al. 2001, JSG

  • Particle Integrated Velocity records the development of accreting forethrust within10 cm of contraction


Model set up

Forethrust

Model Set-Up

  • Simulate 0.5 cm of contraction


Thrust sheet growth

Thrust Sheet Growth


Conclusions thus far

Conclusions thus far…

  • Sandboxes are lazy!

  • The Earth might be lazy.

?


Equilibrium

Equilibrium

  • At equilibrium the ratio of wedge thickness to wedge length is constant.

  • Erosion can disrupt this equilibrium


Erosion

Erosion

  • Iceland


Erosion1

Erosion


Effect of erosion on mountain building

Watch Mario movie


Effect of erosion on mountain building

Erosion Experiment


Implications

Implications

  • After erosion the wedge thickens rather than lengthening. Can accommodate contraction efficiently along the old faults

  • On the non-erosion side, wedge must constantly lengthen because the old faults are buried under heavy sand.

  • Fault system adjusts to slip along the most efficient path <- earth is lazy!


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