21. Parts of the CMB follow shear zones of Precambrian age and the Paleozoic and Mesozoic. 22. Stretched pebble conglomerate L-tectonite illustrating a stretch lineation within a shear zone , Glengarry Basin, Australia. 23. Shear-heating associated with large shear zones in the crust has been proposed as the mechanism. 24. This shear zone is associated with one of the largest gravity anomalies known from continental interiors. 25. Fault systems and networks of active shear zones . 26. Therefore, these north-trending shear zones may have been tectonically active for at least a billion years. 27. Renewed tectonism along the Big Dan Shear Zone displaced sediments east of the Ontario Northland Railway. 28. Subsequent orogeny ( ca . 2680 2655 Ma ) resulted in shear zones and arcuate structures. 29. Some good examples of shear zones of the strike-slip type are the Borborema Shear Zone in Brazil. 30. The spatial arrangement of the lodes and gashes hints at a transtensional, dextral shear zone oriented NW-SE.
