SYNTHESIS OF THE STRUCTURAL EVOLUTION AND ASSOCIATED GOLD MINERALIZATION OF THE CADILLAC FAULT, ABITIBI, CANADA
The structural signature is dominated by a well-developed vertical East-striking schistosity associated with isoclinal folds and reverse shear zone, suggesting a thrusting event. The associated stretching lineation is generally down-dipping. In the Malartic segment, the schistosity curves parallel next to South-East-striking faults. Dip-parallel stretched objects recorded in the Rouyn segment along with a subhorizontal cleavage suggest an exhumation event postdating thrusting. This interpretation is also supported by normal shear zones in the Val-d’Or segment. Shear indicators observed next to the LLCF and several second-order faults, like Z-shaped interference folds, sigmoid objects, and shear relationships, along with subhorizontal stretching lineation, endorse a late dextral strike-slip movement postdating every other event. A NE-striking secondary cleavage associated with this event acts as an axial plan for the bend of the Cadillac Fault between Rouyn and Malartic segments.
Cross-cutting relationships between veins and structural features suggest mineralization occurred before and during the thrusting event as well as the late-dextral strike-slip event.