how do I decouple a zone from a snapshot?

I created a Solaris 10 zone from a snapshot by cloning it :

$ zfs snapshot -r zones/s10-base@deploy

$ zfs send -r zones/s10-base@deploy | pv | zfs recv zones/images/s10-base

creating the zone:

$ zfs clone zones/images/s10-base@deploy zones/ls-sol-Test

Now I have a new Solaris 10 zone names "ls-sol-Test" , which I could boot and use.

I have the belief that the zone and the snapshot are now coupled together, because if I want to change the base image, and want to overwrite it, that's not possible:

$ zfs send -r zones/s10-base@deploy | zfs recv -F zones/images/s10-base