GEOL 1425 1st Edition Lecture 9Outline of Last LectureI. Silliciclastic sedimentary rocksII. Chemical sedimentary rocksOutline of Current Lecture I. DeformationII. Geological mapsCurrent Lecture- Most rocks are deformed in one way or another- Deformation: modifications of rocks by folding and fracturing due to stress- Stress: force intensity, force/surface area. Smaller surface areas will have larger force intensity. This measurement can change depending on the location- Pressure is force intensity but with a uniform measurement, it does not change from direction to direction- Strain is a result of stress.- Different materials react to stress in different ways such as: breaking, fracturing, snap, and crack, brittle.- Stress is most intense near plate boundaries- Deformations include faults. These are brittle in nature.- TX mostly has sedimentary rocks- Tensional stress: extends rock in horizontal direction- Compression: shorten rock in horizontal direction- Shear stress: distorts rock in horizontal direction- Geological maps can show the different types of rocks and structures and fracutres, basins, domes- TX mostly has pre-Cambrian rocks- Outcrops are basic sources for geological information- Wells and petroleum and seismic images provide good pictures for what the interior of earth looks like- Sedimentary rocks that bend in an s shape are ductile in manner- Seismic images of the earth crust uses the same technology as sonograms for pregnant womenThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Tilt of a rock is measures using stike and dip.- Dip is the direction would run down a slope- Strike is perpendicular to the
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