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Lecture 10

Earth Rocks Lecture 10.docx

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Department
Earth Sciences
Course
Earth Sciences 1022A/B
Professor
Stephen R Hicock
Semester
Winter

Description
Earth Rocks Lecture 9 Crustal Deformation Tu,F  ▯Elborn Coll 2186, 2155 20%, 25/30 short answer T or F Fill in the blank Circle choice of 2 Short sentence Simple sketch Deformation • Stress (force) on rocks: o Compressional  ▯squeezing o Tensional  ▯stretching o Shear  ▯slipping sideways    • Strain: results from stress’] Elastic deformation • Stretched beyond their strength  ▯after stresses pass the rock’s elastic limit  (strength), permanent damage occurs  by brittle deformation that is common near  the surface under low P, T conditions • Or dubtile deformation  ▯common deep in the crust (high P, T conditions) • Understress, rocks can exceed the elastic limit before flowing (ductile  deformation) or being fractures (brittle deformation) • Brittle deformation common near surface • Ductile deformation common at depth • Shale, gypsum ▯ • Time is a fa
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