I\'ve got a site running aimed at touchscreens running Firefox (very specific I know, but it will hopefully help with a solution) On the page in question, I\'ve got a d3 map
You might be able to do this using the viewport metatag and Hammer.js
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
This will disable the default browser zoom.
You can then use Hammer.js to capture gesture events which you will then pass to your D3.js code to zoom your map