Lecture 17 Mar 10 2008 Deformation of rocks

Lecture 17 Mar 10 2008 Deformation of rocks - Large-scale...

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Large-scale forces help drive the rock cycle These forces can deform – tilt, bend, and break -- large sections of hard rock in Earth’s crust.
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Folds in originally horizontal rock layers are the result of compressive tectonic forces typical of convergent plate boundaries.
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If rocks break rather than bend, movement along fractures relieves the stress of directed pressure on a section of Earth’s crust.
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Whole sections of bedrock can be tilted as in these limestone and shale beds.
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Uplifted and tilted sandstone and shale have eroded to create this spectacular landscape near Moab, Utah.
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Dip is the angle of steepest descent of the bed from horizontal. Strike is the direction perpendicular to dip. Geologists use the strike and dip to suggest connections among now-discontinuous outcrops that were once a continuous formation.
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Here, the Dakota Sandstone forms a feature called flatirons. The dirt road is (approximately) following strike. Dip
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The Flatirons near Boulder, Colorado, offer good hiking trails.
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subjected to different kinds of tectonic forces. convergent
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This note was uploaded on 04/11/2008 for the course EVSC 280 taught by Professor Herman during the Spring '08 term at UVA.

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Lecture 17 Mar 10 2008 Deformation of rocks - Large-scale...

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