I have a Scheme macro and a long list, and I'd like to map the macro across the list, just as if it were a function. How can I do that using R5RS?

The macro accepts several arguments:

(mac a b c d)

The list has

(define my-list ((a1 b1 c1 d1)
                 (a2 b2 c2 d2)
                 ...
                 (an bn cn dn)))

And I'd like to have this:

(begin
   (mac a1 b1 c1 d2)
   (mac a2 b2 c2 d2)
   ...
   (mac an bn cn dn))

(By the way, as you can see I'd like to splice the list of arguments too)