/* Register template redirect action callback */
add_action('template_redirect', 'meks_remove_wp_archives');
/* Remove archives */
function meks_remove_wp_archives(){
//If we are on category or tag or date or author archive
if( is_category() || is_tag() || is_date() || is_author() ) {
global $wp_query;
$wp_query->set_404(); //set to 404 not found page
}
}