4023 19 - Structure - Folds & Faults (1).pptx

4023 19 - Structure - Folds & Faults (1).pptx - GEO...

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GEO 4023 ENGINEERING GEOLOGY Structure – Folds and Faults
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Homework Assignment #2 Posted on Blackboard Due the last day of class Due in class. After class will be -10 points Each day late will be -10 points No exceptions You can turn it in early for no penalty.
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FINAL EXAM Scantron form X-101864 o This class room o See Final Exam Schedule o Need ParSCORE No. X-101864 test form o Covers o Geology of Texas/SA/Edwards o Structure Folds/Faults o Earthquakes o Dams (slides only) o 50 questions new stuff o 50 questions old stuff o You will need a calculator
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FINAL EXAM DATES Section 001: Monday, December 11 @ 7:00am Section 002: Friday, December 15 @ 9:45am Section 003: Tuesday, December 12 @ 9:45am
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Plate tectonic setting Type of regional stress applied to rock Divergent Extension Convergent Compression Transform Shear
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Folding & Faulting Deformation of rock layers to accommodate compressional and extensional strain by Folding Deformation under compression Faulting Extensional stress Shear stress Compressional stress Normal faults Reverse faults Strike-slip faults
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How do we get folding? Can we really fold a rock?
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How can solid rock be bent and broken? Laboratory deformation of marble
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Under conditions representative of the shallow crust, the marble is brittle. Under conditions representative of the deeper crust, marble is ductile. Ductile Ductile Brittle Brittle An undeformed sample
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Geologic block diagram Cross sections on faces Topography on surface Surficial geology map Shows geologic features at ground surface
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FOLDS
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Anticlines and Synclines Compressive Forces: Convergent Tectonic Regime
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Oldest exposed rock Youngest exposed rock IV III I I II II II II III IV V V IV IV IV Relative Age of Folded Sedimentary Rocks
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Dobra de Canarana, Bahia, Brazil Anticline
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Anticline and Syncline Strike and Dip Cross section Elevation Map view Plan view Press and Siever 1982
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Dip direction Strike direction Dip angle W E S N 45° Dip angle W E S N 45° Measurement of Strike and Dip
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Dip Measurement with Brunton Compass
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Anticline and Syncline Strike and Dip Cross-section Elevation Map view Plan view Press and Siever 1982
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Fold axis Limb Limb Limb Limb Horizontal Fold Axial plane
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Horizontal Limb Limb Lim b Lim b Plunging Fold Axial plane 45°
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