1. INVERSION TECTONICS
Wessex basin

2. “regional”
null-points
footwall short-cuts
buttressing
Inversion in mountain belts

5. “Regional” …the continuous level/orientation
of a horizon through the region
(away from the fault structure)

6. “Regional” for green horizon

7. For ideal contractional structures…
all parts of the structure move to
ABOVE their regional….. For ideal
extensional structures…… all parts
move to BELOW their regional.

19. Net contraction
Null point
Net extension

24. Footwall
short-cut

26. Beware vertical exag

27. Inversion or fault-bend fold?

28. Why structural style matters
for regional orogenic studies

30. Inheritance in the Apennines?
Inversion in the Adriatic
Argnani & Gamberi 1997

31. Ultra-reactivation model. Basement-involved, low displacements
Eastern part of CROP-03
Ultra-reactivation model.
Basement-involved,
low displacements
(8.5 km vs 22 km)
Butler et al. 2004

32. Basement involved – but not simply fault reactivation (like Vercors)
Scisciani et al (J. Struct Geol)

33. pre-existing normal fault
Thrust nucleates on
pre-existing normal fault
Richard Morgan
Deep water Nigeria

34. More information? Geological Society (London) Spec Publs:
Inversion Tectonics (44)
Basin Inversion (88)