The Brazil forward found the top corner from 25 yards after a move which saw him beat two Norwich players and play a one-two with Heung-min Son.
Davinson Sanchez doubled the lead when the Colombian defender lashed home after Norwich failed to deal with a corner before Son made it 3-0 with a neat finish.
The Canaries are three points from safety after their first defeat under Dean Smith.
They missed a golden chance to equalise when 20-year-old Republic of Ireland forward Adam Idah fired wide from close range before Sanchez had made it 2-0.
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