[Haskell-cafe] monoid fold concurrently

[PICCA Frederic-Emmanuel]

Hello, I would like to create a fucntion whcih does

mkCube :: [IO a] -> IO a
mkCube = ...

 I want to fold all this concurrently in order to obtain the final a

I have a function like this

merge :: a -> a -> IO a

in order to sort of merge two a into another one.

I did not found something like this on hoogle.

so I would like your advices in order to write mkCube

Thanks

Frederic