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Geologic structures
 

Geologic structures

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    Geologic structures Geologic structures Presentation Transcript

    • 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
    • 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
    • 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
    • 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
    • FOLDS • Anticline vs. syncline – Hinge line (axis) – Limb – Axial plane • Plunging fold • Structural dome • Structural basin
    • FOLDS • Anticline vs. syncline – Hinge line (axis) – Limb – Axial plane • Plunging fold • Structural dome • Structural basin
    • FOLDS • Anticline vs. syncline – Hinge line (axis) – Limb – Axial plane • Plunging fold • Structural dome • Structural basin
    • 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 reverse • Footwall vs. hanging wall – Normal fault • Graben; Rift • Horst ; fault-block mountain range
    • 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
    • Fractures in rock • Faults – Reverse fault • Thrust fault- low angle reverse fault – Strike-Slip fault • Left-lateral vs. right-lateral
    • Fractures in rock • Faults – Reverse fault • Thrust fault- low angle reverse fault – Strike-Slip fault • Left-lateral vs. right-lateral