I think it is virtually certain the seas of Titan harbor volcanic vents. I would hesitate to risk even a nickel - or iron - they do not also harbor self replicating molecules. Life is so pernicious on earth I am convinced the dang stuff will eventually spring up anywhere given even a paltry billion to one opportunity. I just looked out the back window and observed my swimming pool, which is about 64% clorox by volume, has a noticeably green hue again.