Paged links in Sitemap.xml for taxonomies (including custom ones)?

Okay, I know this is quite rudimentary, but I did something like this:

$tax_query = array(
   array(
      'taxonomy'  => $term->taxonomy,
      'terms'      => $term,
      'field'      => 'slug',
   )
);
$args = array(
   'post_type'            => $taxonomy == 'portfolio-tag' || $taxonomy == 'portfolio-category' ? 'portfolios' : 'post',
   'tax_query'              => $tax_query,
   'posts_per_page'      => '20',
   'post_status'         => 'publish',
   'paged'               => $paged,
);

$wp_query = NULL; $wp_query = new WP_Query( $args );

$pages = $wp_query->max_num_pages;
$range = 2;

 for ( $i = $range; $i <= $pages; $i++) {
   $gsg->AddUrl(get_term_link($term, $term->taxonomy) . 'page/' . $i . '/', $term->_mod_date, $gsg->GetOption("cf_tags"), $gsg->GetOption("pr_tags"));
}

Works for now. Any suggestions welcome.