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GEOLOGIC STRUCTURES
• “Architecture of bedrock”
• Structural Geology– shapes,
– arrangement,
– interrelationships of bedro...
Behavior of rocks to stress
& strain
• Elastic
– Elastic limit

• Plastic
• Brittle

Stress

Strain
Structures as a Record of the
Geologic Past
• Geologic maps and field methods
– Observations of outcrops
– Geologic map
– ...
Structures as a Record of the
Geologic Past
• Geologic maps and field methods
– Observations of outcrops
– Geologic map
– ...
Structures as a Record of the
Geologic Past
• Geologic maps and field methods
– Observations of outcrops
– Geologic map
– ...
FOLDS
• Anticline vs. syncline
– Hinge line (axis)
– Limb
– Axial plane

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

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

• Plunging fold
• Structural dome
• Structural ba...
FOLDS
• Interpreting folds
– Open fold
– Isoclinal fold
– Overturned fold
– Recumbent fold
Fractures in rock
• Joints
– Columnar jointing
– Sheet jointing
– Joint set

• Faults
– Dip-slip faults- normal and revers...
Fractures in rock
• Joints
– Columnar jointing
– Sheet jointing
– Joint set

• Faults
– Dip-slip faults- normal and revers...
Fractures in rock
• Faults
– Reverse fault
• Thrust fault- low angle reverse fault

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

– Strike-Slip fault
• Left-lateral vs....
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
Geologic structures
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Geologic structures

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Transcript of "Geologic structures"

  1. 1. GEOLOGIC STRUCTURES • “Architecture of bedrock” • Structural Geology– shapes, – arrangement, – interrelationships of bedrock – units & forces that cause them
  2. 2. Behavior of rocks to stress & strain • Elastic – Elastic limit • Plastic • Brittle Stress Strain
  3. 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. 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. 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. 6. FOLDS • Anticline vs. syncline – Hinge line (axis) – Limb – Axial plane • Plunging fold • Structural dome • Structural basin
  7. 7. FOLDS • Anticline vs. syncline – Hinge line (axis) – Limb – Axial plane • Plunging fold • Structural dome • Structural basin
  8. 8. FOLDS • Anticline vs. syncline – Hinge line (axis) – Limb – Axial plane • Plunging fold • Structural dome • Structural basin
  9. 9. FOLDS • Interpreting folds – Open fold – Isoclinal fold – Overturned fold – Recumbent fold
  10. 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. 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. 12. Fractures in rock • Faults – Reverse fault • Thrust fault- low angle reverse fault – Strike-Slip fault • Left-lateral vs. right-lateral
  13. 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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