"As the road is cut off, most of the vehicles, competitors, assistance and logistics from the Dakar caravan were diverted on an alternative route through San Antonio de los Cobres, extending the distance ... by about 200 km," the race organisers said in an overnight statement.
"They will not be able to reach the Salta bivouac in time to start the race."
The competitors will instead spend Wednesday travelling to Chilecito for Thursday's 10th stage.
France's Sebastien Loeb leads the car category for Peugeot with British rider Sam Sunderland top of the motorcycle standings.
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(Reporting by Alan Baldwin in London, editing by Richard Lough)
