Folds formed by high levels of compression
- Created by: Brad_ers_B
- Created on: 22-04-14 17:30
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- Folds formed by high levels of compression
- Domes and basins
- Outcrop on a geological map is circular or oval
- They are anticlines and synclines which dip in all directons
- Top of dome eroded away
- Because strata dip towards the centre rocks in basin are youngest
- Overfolds
- Characterised by having both fold limbs dipping in same direction but by different amounts
- A result from compressional forces
- Axial plane is inclines, overfolds can be either anticlinal or synclinal
- Recumbent folds
- Formed by high compressive forces
- Rocks usually imcompetent or plastic in mountain ranges
- Both limbs and axial plane very low angles
- One limb of the recumbent fold is inverted
- Nappe
- Recumbent folds that have broken along a thrust plane
- Movement is horizontal and part of the fold moved forward along the thrust
- Large scale structure
- Isoclinal folds
- Recognised by parallel limbs nearly vertical and very tight folds
- Axial planes are usually vertical
- Recognised on maps by outcrops of repeated and parallel beds
- Domes and basins
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