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GEOLOGIC STRUCTURES

GEOLOGIC STRUCTURES. “Architecture of bedrock” Structural Geology- shapes, arrangement, interrelationships of bedrock units & forces that cause them. Behavior of rocks to stress & strain. Elastic Elastic limit Plastic Brittle. Stress. Strain.

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GEOLOGIC STRUCTURES

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  1. GEOLOGIC STRUCTURES “Architecture of bedrock” Structural Geology- shapes, arrangement, interrelationships of bedrock units & forces that cause them

  2. Behavior of rocks to stress & strain • Elastic • Elastic limit • Plastic • Brittle Stress Strain

  3. Structures as a Record of the Geologic Past • Geologic maps and field methods • Observations of outcrops • Geologic map • Strike and dip • Original horizontality • Strike • Angle of dip • Direction of dip • Symbols • Geologic cross section

  4. Structures as a Record of the Geologic Past • Geologic maps and field methods • Observations of outcrops • Geologic map • Strike and dip • Original horizontality • Strike • Angle of dip • Direction of dip • Symbols • Geologic cross section

  5. Structures as a Record of the Geologic Past • Geologic maps and field methods • Observations of outcrops • Geologic map • Strike and dip • Original horizontality • Strike • Angle of dip • Direction of dip • Symbols • Geologic cross section

  6. FOLDS • Anticline vs. syncline • Hinge line (axis) • Limb • Axial plane • Plunging fold • Structural dome • Structural basin

  7. FOLDS • Anticline vs. syncline • Hinge line (axis) • Limb • Axial plane • Plunging fold • Structural dome • Structural basin

  8. FOLDS • Anticline vs. syncline • Hinge line (axis) • Limb • Axial plane • Plunging fold • Structural dome • Structural basin

  9. FOLDS • Interpreting folds • Open fold • Isoclinal fold • Overturned fold • Recumbent fold

  10. Fractures in rock • Joints • Columnar jointing • Sheet jointing • Joint set • Faults • Dip-slip faults- normal and reverse • Footwall vs. hanging wall • Normal fault • Graben; Rift • Horst ; fault-block mountain range

  11. Fractures in rock • Joints • Columnar jointing • Sheet jointing • Joint set • Faults • Dip-slip faults- normal and reverse • Footwall vs. hanging wall • Normal fault • Graben; Rift • Horst ; fault-block mountain range

  12. Fractures in rock • Faults • Reverse fault • Thrust fault- low angle reverse fault • Strike-Slip fault • Left-lateral vs. right-lateral

  13. Fractures in rock • Faults • Reverse fault • Thrust fault- low angle reverse fault • Strike-Slip fault • Left-lateral vs. right-lateral

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