get_permalink() of page the enclosing page not posts

I think you need the get_post_type_archive_link function. It requires a post type as a parameter, but since you’re already on the archive page you should be able to use it in combination with get_post_type, which gets the current post type by default:

$permalink = get_post_type_archive_link( get_post_type() ); 

See more on the Codex.