PALEOMAGNETISM OF THE GAYS RIVER ZINC-LEAD DEPOSIT, NOVA-SCOTIA - PENNSYLVANIAN ORE GENESIS

The Gays River zinc-lead deposit is the largest known Mississippi Vall ey-type deposit in the Mississippian Windsor Group of Atlantic Canada. Thermal and AF demagnetization show that both ore and host rock have very similar magnetic characteristics. Stability tests constrain the m agnetization to be mid-Mississippian to late Pennsylvanian. The pole p osition from the ore and host rock sites falls next to the Pennsylvani an APW path, suggesting an 8-degrees clockwise rotation of the Meguma platform relative to the craton. Regional thermal history and geochemi cal evidence suggest that the zinc-lead ore magnetization and host roc k remagnetization are coeval.