earth movements Endogenic forces

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earth movements Endogenic forces

  1. 1. Earth movements(endogenetic forces)By Mandeep Kaur Sandhu
  2. 2. • Geological changes can be long time or short time.
  3. 3. Epeirogenic diastrophicEndogenic Orogenic forces sudden
  4. 4. • Sudden forces
  5. 5. • Diastrophic forces (slow forces) – Epeirogenetic (continent origin) – Orogenic (mountain forming) epeirogenetic orogenic Tensional Upward (crustal (emergence) Fracture) Compressional Downward (crustal (submrgence) Bending)
  6. 6. • Upward forces – Upliftment of continents – Upliftment of coastal land
  7. 7. • Downward movements – Submergence of land area (subsidence) – Submergence of land near coast(submergence)
  8. 8. • Orogenic forces are horizontal in nature either – opposite to each other (tensional or divergent forces)
  9. 9. • towards same direction (compressional or convergent ). • Crustal folding • Crustal warping
  10. 10. • Folds – Wave like bends – Due to tangential compressive forces – Anticlines and Synclines
  11. 11. • Types of Folds – Symmetrical folds – Due to regular and moderate forces
  12. 12. • Asymmetrical folds
  13. 13. • Monoclinal folds – More possible to cause faults at intense pressure of the horizontal forces.
  14. 14. • Isoclinal folds
  15. 15. • Recumbent folds
  16. 16. • Overturned folds
  17. 17. • Plunge folds
  18. 18. • Fan folds – Anticlorium and synclorium
  19. 19. • Faults – Crustal rocks are displaced – Due to tensional forces
  20. 20. • Types of Faults – Normal faults – Reverse faults – Lateral faults or strike faults – Step faults
  21. 21. Thanks …

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